ALBERT

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Magdalena Broda, Carmen-Mihaela Popescu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Wood has been extensively used as a material for different applications over the years, therefore the understanding of different degradation processes in various environments is of great importance. In this study, the infrared spectroscopy, X-ray diffraction and chemometric methods were used to evaluate and compare the structure of archaeological and artificially degraded oak wood. The results clearly show that modifications in the structure of archaeological wood are related to the position of the material in the log (sapwood and heartwood), thus the extent of wood degradation. To identify the possible factors influencing these effects, the control wood samples were exposed to artificial white rot biodegradation with 〈em〉Coriolus〈/em〉 (〈em〉Trametes〈/em〉) 〈em〉versicolor〈/em〉 and to alkali treatment (with NaOH solution). Due to the structural similarities between biodegraded wood and control or archaeological samples, this type of decay is likely to occur during natural ageing along with degradation produced by other environmental factors. Further, no real similarity was identified between the alkali treated wood and archaeological samples, indicating that such degradation does not affect wood under natural conditions.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309909-ga1.jpg" width="295" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Prathap Reddy Patlolla, Nakshi Desai, Sharad Gupta, Bhaskar Datta〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The interaction of fluorescent dyes with serum proteins has garnered significant interest owing to potential for non-covalent labeling and imaging applications. In this work, dimeric benzothiazole-based trimethine cyanine dyes are synthesized and their interaction with bovine serum albumin studied. The dimeric cyanine dyes mainly exist as H-dimers and H-aggregates in aqueous solution. A combination of absorbance, fluorescence, circular dichroism spectroscopy and atomic force and fluorescence microscopy indicate the formation of dye-BSA complexes. Binding of one of the dimeric dyes on BSA with a K〈sub〉a〈/sub〉 of 1.49 × 10〈sup〉5〈/sup〉 M〈sup〉−1〈/sup〉 results in disruption of dye self-aggregates and unfolding of the dyes into the monomeric or open conformation. Fluorescence enhancement experienced by the dimeric dyes upon interaction with BSA is superior to that registered by Thioflavin T. Surfactant SDS has been used to further tune the self-aggregation of the dimeric dye resulting in a 200-fold fluorescence enhancement in presence of BSA. Interaction of a dimeric dye with BSA under conditions favoring protein aggregation is found to result in faster dye binding and the resulting fluorescence enhancement is easily visualized by fluorescence microscopy. The interaction of a dimeric cyanine dye aggregate with BSA is promising for non-covalent labeling applications in sharp contrast to the monomeric dye counterpart.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309818-ga1.jpg" width="322" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Huan Zong, Xijiao Mu, Jiangcai Wang, Huifang Zhao, Ying Shi, Mengtao Sun〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉In this paper, we report time resolved fluorescence resonance energy transfer (FRET) using femtosecond ultrafast transient absorption spectroscopy. The lifetimes of FRET are strongly dependent on the molecular concentration and ratio of donor and acceptor. Also, in the FRET, photoinduced intermolecular charge transfer (PICT) is also investigated theoretically. The driving force for PICT in FRET system equals the reorganization energy, which gives barrier-less charge transfer according to Marcus theory. The rates of PICT in the FRET system can be estimated with our simplified Marcus equation. Our results of PICT in FRET system provide a new efficient way for the charge transfer in donor-acceptor system.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309855-ga1.jpg" width="296" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Kai Zhang, Lei Cai, Jianzhong Fan, Yuchen Zhang, Lili Lin, Chuan-Kui Wang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Recently, thermally activated delayed fluorescence (TADF) molecules have attracted great attention since nearly 100% exciton usage efficiency was obtained in TADF molecules. Most TADF molecules used in organic light-emitting diodes are in aggregation state, so it is necessary to make out the intermolecular interaction on their photophysical properties. In this work, the excited-state properties of the molecule AI-Cz in solid phase are theoretically studied by the combined quantum mechanics and molecular mechanics (QM/MM) method. Our results show that geometry changes between the ground state (S〈sub〉0〈/sub〉) and the first singlet excited state (S〈sub〉1〈/sub〉) are limited due to the intermolecular π-π and CH-π interactions. The energy gap between S〈sub〉1〈/sub〉 and the first triplet excited state is broadened and the transition properties of excited states are changed. Moreover, the Huang-Rhys factors and the reorganization energy between S〈sub〉0〈/sub〉 and S〈sub〉1〈/sub〉 are decreased in solid phase, because the vibration modes and rotations are hindered by intermolecular interaction. The non-radiative rate has a large decrease in solid phase which improves the light-emitting performance of the molecule. Our calculation provides a reasonable explanation for experimental measurements and highlights the effect of intermolecular interaction on excited-states properties of TADF molecules.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309867-ga1.jpg" width="499" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Tinggui Chen, Xueying Pei, Yongkang Yue, Fangjun Huo, Caixia Yin〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Cysteine (Cys) is not only the central matter of sulfur metabolism in cells but also the only amino acid with reduced thiol group in 20 kinds of natural amino acids. In animal cells, Cys is taking part in many important and essential biological functions including protein synthesis, detoxification and metabolism. The development and application of fluorescent probes for the detection of Cys have attracted more and more attention and interest. Herein, we report a new fluorescent probe 〈strong〉NFA〈/strong〉 that utilized naphthyl carboxy fluorescein as fluorophore and acryloyl group as reaction site for Cys specific detection. The probe essentially has weak fluorescence. Cys addition to 〈strong〉NFA〈/strong〉 containing system induced distinct enhanced fluorescence emission which was attributed to the nucleophilic reaction of cysteine and acryloyl to release the fluorophore. The signal fluorescent response detection system allows 〈strong〉NFA〈/strong〉 to be a reliable tool for Cys detection with low detection limit (0.58 μM). And 〈strong〉NFA〈/strong〉 has been successfully applied for Cys imaging specifically in live Hela cells, which promotes the probe as a potential tool to understand the pathology of Cys related diseases.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S138614251830982X-ga1.jpg" width="339" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 210〈/p〉 〈p〉Author(s): Chinduluri Sravani, Mohsin Y. Lone, Prakash C. Jha, K.I. Sathiyanarayanan, Akella Sivaramakrishna〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A new series of 2‑styryl phenanthro[9,10‑〈em〉d〈/em〉]oxazoles was readily accessible from the condensation reaction of 9,10‑phenanthroquinone with cinnamaldehydes in the presence of lactic acid. All these styryl dyes were isolated in good yields and characterized by various analytical and spectroscopic techniques. One of the dyes containing 〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉NO〈sub〉2〈/sub〉 group (〈strong〉3d〈/strong〉) was structurally characterized by single crystal X-ray analysis. These dyes displayed emission in blue to green region with larger Stokes shift values characteristic to the nature of substituents. In addition, positive solvatochromic trend was observed by increasing the solvent polarity suggestive of a more stabilized polar excited state. Moreover, the addition of trifluoroacetic acid leads to a prominent blue-shift in visible and emission color changes owing to the protonation of the nitrogen atom of oxazole moiety. Among the all, the oxazole derivative having 〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉NMe〈sub〉2〈/sub〉 group (〈strong〉3b〈/strong〉) exhibits good response to acidic pH in the range of 3.0 to 5.6 with a good linearity upon decreasing the pH from 8.0 to 2.16. The absorption studies were further supported by density functional theory calculations.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309880-ga1.jpg" width="430" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Anxin Jiao, Xuejian Dong, Hua Zhang, Linlin Xu, Yue Tian, Xiangdong Liu, Ming Chen〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Ultrasensitive detection of pesticide residues on agricultural products using surface-enhanced Raman spectroscopy (SERS) is of significant interest in food security. Herein, worm-like AuAg nanochains with highly interconnected ultrafine (~6.2 nm) bimetallic particles were developed as an excellent SERS nanosensor via laser-assisted strategy. The SERS detection limit of thiram molecules on apple surfaces is about 10〈sup〉−7〈/sup〉 M (0.03 ppm), which is about 200 times lower than the maximal residue limit (MRL, 7 ppm) in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Importantly, the established excellent linear relationships between the SERS intensities and thiram concentrations can sensitively monitor the slight variation of pesticide residues in agriculture.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309843-ga1.jpg" width="331" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 208〈/p〉 〈p〉Author(s): 〈/p〉

Description: 〈p〉Publication date: 15 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 209〈/p〉 〈p〉Author(s): Manjushree M., Revanasiddappa H.D.〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Bupropion hydrochloride (BPH) an antidepressant and widely used to treat addiction of nicotine. The actual protein existing in blood plasma for the vehicle of exogenous and endogenous substances is human serum albumin 〈em〉i〈/em〉.〈em〉e〈/em〉. HSA. The interaction of BPH with HSA was examined by molecular docking, multiple spectroscopy's such as fluorescence (emission, synchronous and three-dimensional), UV–vis (ultraviolet–visible), FT–IR (Fourier transform infrared) and CD (circular dichroism) at physiological pH 7.40 at 286, 296 and 306 K. BPH was particularly bind to HSA through forces called hydrogen bonds and vander Waals at site I (IIA) which was confirmed from negative values of thermodynamics calculated by van't Hoff equation and docking studies in addition to site marker analysis. This interaction was spontaneous and exothermic process. Secondary structure including conformation of HSA changes after interaction with BPH was revealed from CD and FT–IR (Fourier self-deconvolution to curve fitting), UV–vis, 3D and synchronous florescence techniques. Forster's theory (non–radiation energy transfer) was applied to calculate the distance from tryptophan of HSA to BPH. This interaction involves static quenching (Stern–Volmer and Modified Stern–Volmer equations) with larger binding constant values were in the range 10〈sup〉5〈/sup〉 confirming that strong interaction was exists between BPH and HSA. The interference of bio-active Mg〈sup〉2+〈/sup〉, Cu〈sup〉2+〈/sup〉, Zn〈sup〉2+〈/sup〉, Ca〈sup〉2+〈/sup〉 and Fe〈sup〉2+〈/sup〉 metal ions on this interaction was also analysed.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309806-ga1.jpg" width="410" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 208〈/p〉 〈p〉Author(s): Xing Peng, Xian Wei, Tieyu Chen〈/p〉

Description: 〈p〉Publication date: 5 February 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 208〈/p〉 〈p〉Author(s): 〈/p〉

Description: 〈p〉Publication date: 5 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 210〈/p〉 〈p〉Author(s): Peng Qu, Xiaohua Ma, Wansong Chen, Dandan Zhu, Huifei Bai, Xiuhua Wei, Shu Chen, Maotian Xu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A new ratiometric fluorescent probe (〈strong〉1〈/strong〉) was developed for the detection of hydrazine. The probe was obtained by incorporating the recognition moiety of acetyl group onto a coumarin fluorophore. Probe 〈strong〉1〈/strong〉 displayed a distinct cyan emission in a 100% aqueous phosphate buffer solution. In the presence of hydrazine, probe 〈strong〉1〈/strong〉 undergoes a hydrazinolysis process to release the coumarin fluorophore, which exhibited significant hypsochromic shifts in both absorption and emission spectra, and thus achieving a ratiometric response. This ratiometric probe is highly selective and sensitive towards hydrazine detection. The limit of detection (LOD) was calculated to be 34 nM. Moreover, cellular toxicity and imaging experiments suggested that probe 〈strong〉1〈/strong〉 is can be used to monitor hydrazine in live cells.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518309983-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 210〈/p〉 〈p〉Author(s): Na-Na Li, Yu-Qing Ma, Xue-Jiao Sun, Ming-Qiang Li, Shuang Zeng, Zhi-Yong Xing, Jin-Long Li〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A simple naphthalene derivative, 6-hydroxy-2-naphthohydrazide (〈strong〉NAH〈/strong〉), was designed and synthesized through two facile steps reactions with the 6-hydroxy-2-naphthoic acid (NCA) as the starting material. In neat H〈sub〉2〈/sub〉O (10% 0.01 M HEPES buffer, v/v, pH = 7.4), probe 〈strong〉NAH〈/strong〉 showed a highly selective and sensitive response towards Fe〈sup〉3+〈/sup〉 via perceptible color change and displayed “turn-on” dual-emission fluorescence response for Cu〈sup〉2+〈/sup〉. The binding stoichiometry ratio of 〈strong〉NAH〈/strong〉/Cu〈sup〉2+〈/sup〉 and 〈strong〉NAH〈/strong〉/Fe〈sup〉3+〈/sup〉 were all confirmed as 1:1 by the method of fluorescence job's plot and UV–Vis job's plot, respectively. Probe 〈strong〉NAH〈/strong〉 can be used over a wide pH range for the determination of Fe〈sup〉3+〈/sup〉 (2.0–10.0) and Cu〈sup〉2+〈/sup〉 (6.0–10.0) without interference from other co-existing metal ions. A possible detection mechanism was the hydrolysis of 〈strong〉NAH〈/strong〉 upon the addition of Fe〈sup〉3+〈/sup〉 or Cu〈sup〉2+〈/sup〉, thereby leading to the formation of 6-hydroxy-naphthalene-2-carboxylic acid (〈strong〉NCA〈/strong〉) which was further confirmed by the various spectroscopic techniques including FT-IR, 〈sup〉1〈/sup〉H NMR titration and HRMS. Moreover, 〈strong〉NAH〈/strong〉 was successfully applied to the detection of Cu〈sup〉2+〈/sup〉 and Fe〈sup〉3+〈/sup〉 in tap water, ultrapure water and BSA.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S138614251831028X-ga1.jpg" width="333" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Chuang Liu, Keyin Liu, Minggang Tian, Weiying Lin〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Hydrazine and its derivatives are one of the most important raw chemical materials that have extensive utilization in many areas. It is also widely applied as pharmaceutical derivatives, such as the antipsychotic drug, anti-infective drug, and antitumor drug. However, hydrazine is a highly toxic reagent which can bring severe damage to human and animals. Herein, we have reported a new benzothiazole substituted naphthalene based probe for hydrazine with huge fluorescence change ratio. The fluorescence change ratio at F〈sub〉390〈/sub〉/F〈sub〉509〈/sub〉 is up to 200-fold in the presence of hydrazine in 60 min. The probe exhibited negligible cytotoxicity toward HeLa cells and was applied for hydrazine detection successfully in HeLa cells.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310886-ga1.jpg" width="447" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Qingming Wang, Lei Jin, Wenling Wang, Lihui Dai, Xiaoxue Tan, Cong Zhao〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉This work, two turn-on fluorescent probes (3-acetyl-2H-chromen-2-one (〈strong〉ACO〈/strong〉) & (1E)-1-(1-(2-oxo-2H-chromen-3-yl)ethylidene)thiosemicarbazide (〈strong〉CETC〈/strong〉)) based on coumarin have been designed and synthesized, which could selectively and sensitively recognize ClO〈sup〉−〈/sup〉 with fast response time. 〈strong〉ACO〈/strong〉 & 〈strong〉CETC〈/strong〉 were almost non fluorescent possibly due to both the lacton form of coumarin and unbridged C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉N bonds which can undergo a nonradiative decay process in the excited state. Upon the addition of ClO〈sup〉−〈/sup〉, 〈strong〉ACO〈/strong〉 & 〈strong〉CETC〈/strong〉 were oxidized to ring - opened by cleavage the C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉O and C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉N and the fluorescence intensity were increased considerably. Fluorescence titration experiments showed that the detection limit 〈strong〉ACO〈/strong〉 & 〈strong〉CETC〈/strong〉 is as low as 22 nm and 51 nm respectively. In particular, some relevant reactive species, including 〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/rad"〉OH, 〈sup〉1〈/sup〉O〈sub〉2〈/sub〉, H〈sub〉2〈/sub〉O〈sub〉2〈/sub〉, KO〈sub〉2〈/sub〉, some anions and cations cannot be interference with the test. In live cell experiments, 〈strong〉ACO〈/strong〉 & 〈strong〉CETC〈/strong〉 were successfully applied to image exogenous ClO〈sup〉−〈/sup〉 in HepG2 cells. Therefore, 〈strong〉ACO〈/strong〉 & 〈strong〉CETC〈/strong〉 not only could image ClO〈sup〉−〈/sup〉 in living cells but also proved that C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉O and C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉N can be cleavage by ClO〈sup〉−〈/sup〉.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉Two new coumarin-based fluorescent probes were synthesized and successfully achieved for the efficient detection of ClO〈sup〉−〈/sup〉 as turn - on fluorescence chemosensors in Tris - HCl buffer/DMSO (〈em〉v〈/em〉:〈em〉v〈/em〉 = 9:1, 20 mM, 〈em〉pH〈/em〉 = 7.0) with the detection of limit (LOD) as low as 22 nM and 51 nM, respectively.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310825-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Anees A. Ansari, Naushad Ahmad, Joselito P. Labis, Ahmed Mohamed El-Toni, Aslam Khan〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Tb-doped Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 microspheres (MSs) were prepared via a homogeneous thermal degradation process at a low temperature and then coated with a nanosilica shell (Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉:Tb@SiO〈sub〉2〈/sub〉) using a sol-gel process. The core MSs were highly crystalline and spherical with a porous surface, single cubic phase, and particle size of 100–250 nm. Transmission electron microscopy (TEM) images clearly showed the spherical shape of the as-prepared core MSs, which were fully covered with a thick and mesoporous nanosilica shell. Fourier transform infrared (FTIR) spectra displayed the well-resolved infrared absorption peaks of silica (Si〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉O, Si〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉O〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉Si, etc.), confirming the presence of the silica surface coating. The core MSs retained their spherical shape even after heat treatment and subsequent silica surface coating. It was observed that the core/shell MSs are easily dispersible in aqueous media and form a semi-transparent colloidal solution. Ultraviolet/visible and zeta potential studies were tested to prove the changes in the surface chemistry of the as-designed core/shell MSs and compare with their core counterpart. The growth of the amorphous silica shell not only increased the particle size but also enhanced remarkably the solubility and colloidal stability of the MSs in aqueous media. The strongest emission lines originating from the characteristic intra-shell 4f-4f electronic transitions of Tb ions were quenched after silica layer deposition, but the MSs still showed strong green (〈sup〉5〈/sup〉D〈sub〉4〈/sub〉 → 〈sup〉7〈/sup〉F〈sub〉5〈/sub〉 at 530–560 nm as most dominant) emission efficiency, which indicates great potential in fluorescent bio-probes. The emission intensity is discussed in relation to the quenching mechanism induced by surface silanol (Si-OH) groups, particle size, and surface charge.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310771-ga1.jpg" width="267" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Hongwei Ren, Xue Wang, Shaohan Lian, You Zhang, Erhong Duan〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Deep eutectic solvents (DES) are generally composed of two or three cheap and safe components that are associated with each other via hydrogen bonds. The formation Caprolactam (CPL)-tetraalkyl ammonium halide (TAAX) DES and its hydrate were investigated using React IR. TAAX was introduced to CPL in the molten state at 353.15 K, the intermolecular H-N-C=O⋯H-N-C=O hydrogen bonds (CPL dimer) transfer to X〈sup〉−〈/sup〉⋯H-N-C=O (CPL-TAAX DES). When water was added to CPL-TAAX DES, intermolecular X〈sup〉−〈/sup〉⋯H-N-C=O⋯H-O-H hydrogen bonds appeared, and CPL-TAAX DES hydrate was formed. However, if the ratio of water exceeded the moral fraction of 0.61, CPL-TAAX DES hydrate turned into a CPL-TAAX aqueous solution. The C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉O (1660 cm〈sup〉−1〈/sup〉) bonds were linearly correlated with hydrogen bonds number and TBAB amount in CPL-TBAB DES. When the molar fraction of CPL-TBAB DES was 0.39 to 0.78, the C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉O peak redshift has a better linear correlation with water. Halide anions and the alkyl chain length of TAAX have little influence on the redshifts and peak intensity of the C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉O peak.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310679-ga1.jpg" width="344" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Abdel Majid A. Adam, Hala H. Eldaroti, Mohamed S. Hegab, Moamen S. Refat, Jehan Y. Al-Humaidi, Hosam A. Saad〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉In our previous work, we highlighted the thermodynamic and spectroscopic characteristics of the 1:1 charge transfer (CT) complexation of TCNE acceptor with various medically important drugs. Continuing that work, we further examine drugs that react with the TCNE acceptor via a 1:2 interaction. The examined drugs are atenolol, quinidine, cimetidine, reserpine, and levofloxacin. We aimed through this study to: 〈em〉i〈/em〉) make the spectrophotometric and thermodynamic data of the examined drugs, both initially and when reacted via a 1:2 M ratio with the TCNE acceptor, available to use in the determination or detection of these drugs in pharmaceuticals and other environments; and 〈em〉ii〈/em〉) compare the mode of interactions and the spectrophotometric and thermodynamic properties between drugs that react via a 1:1 or 1:2 ratio with the TCNE acceptor. To achieve these aims, the five examined drugs were reacted with TCNE in acetonitrile (MeCN) solvent at room temperature. Several thermodynamic and spectroscopic data were experimentally estimated using the van't Hoff and the Benesi–Hildebrand equations and discussed.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉Electronic absorption spectrum of the CT product that formed form the reaction of drug Qui with TCNE acceptor in MeCN solvent.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310709-ga1.jpg" width="455" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Yingping Li, Yong Jia, Qi Zeng, Xiaohui Jiang, Zhengjun Cheng〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉We used thiamine nitrate (TN) as single material to fabricate nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a quantum yield of 10.4% through one-pot hydrothermal method, and its properties were characterized by TEM, XPS, FTIR, fluorescence (FL) and UV–vis spectrophotometer, respectively. The fluorescence of N,S-CQDs was effectively quenched in the presence of vitamin B12 (VB12)/tartrazine due to Förster resonance energy transfer (FRET). Moreover, the rate (〈em〉K〈/em〉〈sub〉T〈/sub〉) and efficiency (〈em〉E〈/em〉%) of energy transfer from N,S-CQDs (as a donor) to VB12/tartrazine (as an acceptor) enhanced with increasing the concentrations of acceptor, and the 〈em〉K〈/em〉〈sub〉T〈/sub〉 and 〈em〉E〈/em〉% were also varied with the change of excitation wavelengths (from 338 to 408 nm). Based on this principle, a multifunctional fluorescence probe was designed for selective and sensitive detection of VB12/tartrazine with a detection limit (3σ/slope) of 15.6/18.0 nmol/L. Meanwhile, the proposed method was successfully employed to detect VB12/tartrazine in milk and several beverages with a recovery range of 97.5–104.2%/91.0–110.6%.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉N,S-CQDs as a multifunctional sensor has remarkable selectivity and high sensitivity for monitoring VB12/tartrazine, and the FL quenching of N,S-CQDs by VB12/tartrazine was further analyzed by FRET theory. The 〈em〉r〈/em〉 values decrease with increasing the concentration of acceptor (VB12/tartrazine) (A/B), and corresponding 〈em〉E〈/em〉% and 〈em〉K〈/em〉〈sub〉T〈/sub〉 values (C/D) show an opposite change tendency.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310643-ga1.jpg" width="301" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Xiao Wang, Yanmei Zhou, Chenggong Xu, Haohan Song, Xiaobin Pang, Xiaoqiang Liu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Hydrazine (N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉) and fluoride ion (F〈sup〉−〈/sup〉) are regarded as environmental pollutants and potential carcinogens. A dual-functional fluorescent probe (probe 〈strong〉1〈/strong〉) was developed for both F〈sup〉−〈/sup〉 and N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 with high selectivity and sensitivity. 〈strong〉1〈/strong〉 was based on nucleophilic aromatic substitution reaction for N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 detection and selective cleavage of 4-nitrobenzenesulphonyl group for the determination of F〈sup〉−〈/sup〉. The limits of detection of probe for F〈sup〉−〈/sup〉 and N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 were 77.82 nM and 29.34 nM, respectively, which are far below the threshold limit value (TLV) of United States Environmental Protection Agency (EPA). The home-made test strips of 〈strong〉1〈/strong〉 provided the positive tool for F〈sup〉−〈/sup〉 and gaseous N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 in different system. And the confocal fluorescence images indicated that 〈strong〉1〈/strong〉 can quantitatively detect N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 in living PC12 cells. Promisingly, 〈strong〉1〈/strong〉 has great prospects for N〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 imaging and determining in living system.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉A 4-nitrobenzenesulphonyl group-cleavage based fluorescent probe was prepared for highly selective and sensitive dual-detection of fluoride ion and gaseous hydrazine on home-made test strips. This probe was successfully applied to quantitatively detect hydrazine in living cells.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310667-ga1.jpg" width="317" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Jian Zhu, Xiao-Hong Chen, Jian-Jun Li, Jun-Wu Zhao〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉In this work, the novel tetrapod gold nanostars with four specific numbers of sharp tips were synthesized with good uniformity, high yield and chemical stability. The size of tetrapod gold nanostars has been increased effectively by increasing the amount of HAuCl〈sub〉4〈/sub〉 or DEA added to the reaction solution, and the corresponding in-plane localized surface plasmon resonance (LSPR) band can shift from 700 to 1100 nm. In order to combine the advantages of different metals, the Ag-coated tetrapod gold nanostars were prepared with different Ag coating thicknesses by increasing the volume of AgNO〈sub〉3〈/sub〉. With the increase of Ag coating thickness, the morphology of the nanoparticles has changed from gold nanostars with four sharp tips to bimetallic cuboids with four sharp tips and finally to crore-shell cuboids completely. The surface-enhanced Raman scattering (SERS) activity of Ag-coated tetrapod gold nanostars has also been improved with the different Ag coating thicknesses. Combined the tip effect and the enhancement effect of Ag, the SERS activity has the strongest enhancement when the four sharp tips of tetrapod gold nanostars are not completely coated by the Ag layer but still exposed to the outsides. For tetrapod gold nanostars with larger size to grow Ag-coated tetrapod gold nanostars, the bimetallic cuboids with four sharp tips nanostructure have the biggest SERS enhancement factor (EF) of 1.73 × 10〈sup〉6〈/sup〉 for Rhodamine 6G (R6G), making it an ideal candidate in SERS-based sensing application.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉The SERS activity has been strongly improved when the four sharp tips of tetrapod gold nanostars (In-plane LSPR at 916 nm) are not completely coated by the Ag layer but still exposed to the outsides.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310631-ga1.jpg" width="284" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Rupa Pegu, Gopal Pandit, Ankur Kanti Guha, Sajal Kumar Das, Sanjay Pratihar〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉In this report, 6〈em〉H〈/em〉-indolo[2,3-〈em〉b〈/em〉]quinoline (hereafter 〈strong〉2a〈/strong〉) was synthesized and employed as an optical chemosensor for fluoride. The sensitivity of 〈strong〉2a〈/strong〉 towards fluoride was established from the change in both the absorption and emission signals. The various 〈em〉in-situ〈/em〉〈sup〉1〈/sup〉H NMR, UV–Vis, and density functional studies indicate that the 1:2 binding interaction between 〈strong〉2a〈/strong〉 and fluoride followed by deprotonation to its corresponding di-anion (〈strong〉2a〈/strong〉〈sup〉〈strong〉2−〈/strong〉〈/sup〉), which in turn boosted the donor-acceptor interaction between indole and quinoline moiety in 〈strong〉2a〈/strong〉〈sup〉〈strong〉2−〈/strong〉〈/sup〉〈em〉via〈/em〉 expansion of torsion angle by 10.2° as compared to 〈strong〉2a〈/strong〉. Consequently the significant changes in both the absorption and emission signal of 〈strong〉2a〈/strong〉 allow us to detect and estimate the concentration of fluoride up to 0.2 μM from the mixture of different anions.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310618-ga1.jpg" width="431" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Hui Chen, Chao Tan, Zan Lin, Hongjin Li〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The authentication of traditional Chinese medicine (TCM) is critically important for public-health and economic terms. Notoginseng, a classical TCM of high economic and medical value, could be easily adulterated with 〈em〉Sophora flavescens〈/em〉 powder (SFP), corn flour (CF) or other analogues of low-grade (ALG) because of their similar tastes, appearances and much lower cost. The main objective of this study was to evaluate the feasibility of applying of near-infrared (NIR) spectroscopy and multivariate calibration for identifying and quantifying several common adulterants in notoginseng powder. Two datasets were prepared for experiment. The competitive adaptive reweighted sampling (CARS) was used to select informative variables. Two different schemes were used for sample set partition. Model population analysis (MPA) was made. The results showed that, the constructed partial least squares (PLS) model using a reduced set of variables from CARS can provide superior performance to the full-spectrum PLS model. Also, the sample set partition is very of great importance. It seems that the combination of NIR spectroscopy, CARS and PLS is feasible to quantify common adulterants in notoginseng powder.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310655-ga1.jpg" width="267" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Graham Hungerford, M. Adília Lemos, Boon-Seang Chu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The binding of an extract from the flowers of 〈em〉Clitoria ternatea〈/em〉 L. to the digestive enzyme α-amylase was investigated. This extract is a mixture of flavonoids, including anthocyanins, and has been previously shown to inhibit the activity this enzyme. This has implications for modulating starch digestion. In order to investigate the kinetics, we made use of time-resolved fluorescence to simultaneously monitor two different emission bands emanating from the extract. This measurement was enabled by the use of a “photon streaming” approach and changes in fluorescence lifetime and intensity were used to follow the interaction. A longer wavelength band (655 nm) was ascribed to anthocyanins in the mixture and these were observed to bind at a rate an order of magnitude slower than other flavonoids present in the extract, monitored at a shorter wavelength (485 nm). Changes in the fluorescence emission of the extract upon binding were further assessed by the use of decay associated spectra.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉Binding of 〈em〉C. ternatea〈/em〉 extract to α-amylase followed using time-resolved fluorescence monitoring 2 wavelengths simultaneously using a photon streaming approach.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S138614251831059X-ga1.jpg" width="480" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Xiaojing Yang, Yingying Wang, Mei-xia Zhao, Wei Yang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉By introducing the S-aryl substituents at the central carbon on heptamethine cyanine, we have developed a near-infrared fluorescent probe Cy.7-PT. The probe had the high selectivity for the colorimetric detection of Cys/Hcy with the color changing from light green to blue. Cys could be quantitatively detected and the detection limit is 0.39 μM. Cell imaging and spiked samples experiments prove that the probe Cy.7-PT is suitable for monitoring and visualizing Cys in vitro and living cells.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311120-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Mao-Sen Xu, Chuan-Lu Yang, Mei-Shan Wang, Xiao-Guang Ma〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉To evaluate the feasibility of the laser cooling of CuH molecule, we investigate the electronic properties, the vibrational and rotational characteristics of the molecule based on the multi-reference configuration interaction method with all-electron basis sets. The potential energy curves (PECs) of X〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉, A〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉, B〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉, a〈sup〉3〈/sup〉Σ〈sup〉+〈/sup〉, b〈sup〉3〈/sup〉Σ〈sup〉+〈/sup〉, e〈sup〉3〈/sup〉Σ〈sup〉+〈/sup〉, C〈sup〉1〈/sup〉П, D〈sup〉1〈/sup〉П, c〈sup〉3〈/sup〉П and d〈sup〉3〈/sup〉П states and the transition dipole moments between these states are calculated. The Schrödinger equation of nuclear movement is solved for each electronic state to obtain the rotational and vibration energy levels. The spectroscopic parameters are calculated based on the fitted analytical function from the PECs. The present results are in good agreement with the theoretical and experimental values available in the literature. The optical scheme of the laser cooling for CuH molecule is constructed with A〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉 ↔ X〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉 as the close-loop transition. Three lasers are necessary in each direction to maintain enough scattering photons because of the limited Franck-Condon factor of 0.78. The wavelengths of the pumping lasers are determined. The recoil temperature is 1.72 μk, which is the expected temperature to be reached through the method of the cooling below the doppler limit.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉The laser cooling scheme of CuH molecule has been constructed with the closed transition of A〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉 ↔ X〈sup〉1〈/sup〉Σ〈sup〉+〈/sup〉 and three pumping lasers.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311089-ga1.jpg" width="318" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): V. Charles Vincent, K. Kirubavathi, G. Bakiyaraj, K. Selvaraju〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The solution grown structure 4-hydroxy L-proline cadmium chloride (4HLPCC) single crystal has been done by means of X-ray diffraction method. The computational quantum mechanical modelling method was performed with B3LYP level and LanL2DZ basis set to determine optimized geometry, dipolar moment, linear polarizability, first order hyperpolarizability, atomic charges of various atoms, thermodynamic parameters, HOMO-LUMO energy gap and vibrational frequencies of 4HLPCC. The vibrational frequencies of 4HLPCC were observed experimentally through FTIR and FT-RAMAN analyses and compared with theoretical frequencies. The electric properties were detected by dielectric studies. The frequency doubling of the grown crystal was made with Kurtz-Perry powder technique.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311077-ga1.jpg" width="347" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Shiwen Zhang, Qiang Shen, Chaojia Nie, Yuanfang Huang, Jianhua Wang, Qingqing Hu, Xuejiao Ding, Yan Zhou, Yuanpeng Chen〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Conventional methods for investigating heavy metal contamination in soil are time consuming and expensive. We explored reflectance spectroscopy as an alternative method for assessing heavy metals. Four spectral transformation methods, first-order differential (FDR), second-order differential (SDR), continuum removal (CR) and continuous wavelet transform (CWT), are used for the original spectral data. Spectral preprocessing effectively eliminated the noise and baseline drifting and also highlighted the locations of the spectral feature bands. Partial least squares regression (PLSR) and radial basis function neural network (RBF) were used to study the hyperspectral inversion of four heavy metals (Cr, As, Ni, Cd). The inversion models of four heavy metals were established in the bands with the highest correlation coefficient. The inversion effects were evaluated by the coefficient of determination (〈em〉R〈/em〉〈sup〉2〈/sup〉), root mean square error (RMSE) and residual predictive deviation (RPD) indexes. The 〈em〉R〈/em〉 values of the correlation coefficient were significantly improved after smoothing and spectral transformation compared to the original waveband. The method combining continuous wavelet transform (CWT) with radial basis function neural network (RBF) had the best inversion effect on the four heavy metals. When compared to partial least squares regression (PLSR), the RMSE values were reduced by approximately 2. The CWT-RBF method can be used as a means of inversion of heavy metals in mining wasteland reclaimed land.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311028-ga1.jpg" width="348" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 210〈/p〉 〈p〉Author(s): 〈/p〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Kessarin Ngamdee, Kanokwan Chaiendoo, Chatree Saiyasombat, Wutthikrai Busayaporn, Somlak Ittisanronnachai, Vinich Promarak, Wittaya Ngeontae〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A highly selective circular dichroism sensor based on cysteamine-capped cadmium sulfide quantum dots (Cys-CdS QDs) was successfully developed for the determination of Cu〈sup〉2+〈/sup〉. Basically, the Cys-CdS QDs are not active in circular dichroism spectroscopy. However, the circular dichroism probe (DPA@Cys-CdS QDs) can be simply generated 〈em〉in situ〈/em〉 by mixing achiral Cys-CdS QDs with D-penicillamine. The detection principle was based on measuring the circular dichroism signal change upon the addition of Cu〈sup〉2+〈/sup〉. The strong CD signal of the DPA@Cys-CdS QDs dramatically decreased in the presence of Cu〈sup〉2+〈/sup〉, while other cations did not result in any spectral changes. In addition, the degree of the CD signal decrease was linearly proportional to the concentration of Cu〈sup〉2+〈/sup〉 in the range of 0.50–2.25 μM (r〈sup〉2〈/sup〉 = 0.9919) with a detection limit of 0.34 μM. Furthermore, the proposed sensor was applied to detect Cu〈sup〉2+〈/sup〉 in drinking water samples with %recovery values of 102–114% and %RSD less than 6%.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉Cysteamine-capped cadmium sulfide quantum dots (Cys-CdS QDs) were mixed with D-penicillamine (DPA) to generate the sensor probe (DPA@Cys-CdS QDs). The generated chiral CdS QDs were used as a selective sensor for the detection of Cu〈sup〉2+〈/sup〉 by measuring the decrease in the CD intensity.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310953-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Huimin Kang, Congbin Fan, Gang Liu, Shouzhi Pu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A new-synthesized diarylethene with near-infrared fluorochrome unit exhibited excellent photochromism under the irradiation of UV light (297 nm) and visible light (〈em〉λ〈/em〉 〉 500 nm). When Cu〈sup〉2+〈/sup〉 was added to the diarylethene solution, a fluorescent emission band centered at 736 nm appeared, indicating that the emission peak wavelength of compound is in near-infrared region. According to data of NMR, MS and other experiments, the complex ratio of the target compound to Cu〈sup〉2+〈/sup〉 was 1:1 in the CH〈sub〉3〈/sub〉CN–H〈sub〉2〈/sub〉O solution (v/v = 9:1) with a limit of detection (LOD) of 0.10 μM. Furthermore, a logic circuit was constructed with four input signals (ultraviolet stimulus, visible light stimulus, Cu〈sup〉2+〈/sup〉 and EDTA) and one output signal (fluorescent intensity at 736 nm).〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310965-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Yichen Jin, Tao Pang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Upconversion luminescence and optical temperature sensing properties of Yb〈sup〉3+〈/sup〉/Er〈sup〉3+〈/sup〉/Li〈sup〉+〈/sup〉 tri-doped ZnMoO〈sub〉4〈/sub〉 phosphors were investigated. It has been demonstrated that Li〈sup〉+〈/sup〉 doping affected not only the local symmetry of Yb〈sup〉3+〈/sup〉 and Er〈sup〉3+〈/sup〉 but also the distribution of them in the host lattice. As a result, the significantly improved green upconversion luminescence was obtained when excited at 980 nm. The pumping power dependent photo-thermal behavior was used to evaluate the reliability of upconversion temperature sensing. An accurate temperature scale was established by eliminating the impact of thermal effect, and the sensing ability was evaluated via a comparison with the results reported in literatures.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉Accurate temperature scale based on upconversion luminescence of ZnMoO〈sub〉4〈/sub〉:Yb〈sup〉3+〈/sup〉, Er〈sup〉3+〈/sup〉, Li〈sup〉+〈/sup〉 under 980 nm excitation.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310813-ga1.jpg" width="299" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Yan Gong, Huifeng Liang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Nickel ions (Ni〈sup〉2+〈/sup〉) were detected by a new imidazole modified carbon dots (CDs) based on fluorescence quenching method. Structural characterization of CD-imidazole quantum dots were accomplished by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Spectroscopic properties were characterized by ultraviolet absorption spectrum and fluorescence spectrum. Ni〈sup〉2+〈/sup〉 concentration showed good linear relationship with fluorescence quenching efficiency in the range of 6–100 mM (〈em〉R〈/em〉 = 0.99) and the limit of detection (LOD) was 0.93 mM. Imidazole modified CDs have strong selectivity of Ni〈sup〉2+〈/sup〉 compared with other metal ions in aqueous solution. These results demonstrated that the fluorescence sense platform based on imidazole modified CDs can be applied to Ni〈sup〉2+〈/sup〉 detection in environment.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉A fluorescence aptasensor switch was developed for Ni〈sup〉2+〈/sup〉 detection by imidazole modified carbon dots.〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310862-ga1.jpg" width="324" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Yan Liu, Yixin Wang, Zhenzhen Xia, Yingjie Wang, Yongning Wu, Zhiyong Gong〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Phytosterols have been extensively studied because it plays essential roles in the physiology of plants and can be used as nutritional supplement to promote human health. We use a rapid method by coupling near-infrared spectroscopy (NIRS) and chemometric techniques to quickly and efficiently determine three essential phytosterols (〈em〉β〈/em〉-sitosterol, campesterol and stigmasterol) in vegetable oils. Continuous wavelet transform (CWT) method was adopted to remove the baseline shift in the spectra. The quantitative analysis models were constructed by partial least squares (PLS) regression and randomization test (RT) method was used to further improve the models. The optimized models were used to calculate the phytosterol contents in prediction set in order to evaluate their predictability. We have found that the phytosterol contents obtained by the optimized models and Gas Chromatography/Mass Spectrometry (GC/MS) analysis are almost consistent. The root mean square error of prediction (RMSEP) and ratio of prediction to deviation (RPD) for the three phytosterols are 525.7590, 212.2245, 65.1611 and 4.0060, 4.7195 and 3.5441, respectively. The results have proved the feasibility of the proposed method for rapid and non-destructive analysis of phytosterols in edible oils.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311004-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 210〈/p〉 〈p〉Author(s): 〈/p〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Wan Mohd Ebtisyam Mustaqim Mohd Daniyal, Yap Wing Fen, Jaafar Abdullah, Amir Reza Sadrolhosseini, Silvan Saleviter, Nur Alia Sheh Omar〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Surface plasmon resonance (SPR) is a label-free optical spectroscopy that is widely used for biomolecular interaction analysis. In this work, SPR was used to characterize the binding properties of highly sensitive nanocrystalline cellulose-graphene oxide based nanocomposite (CTA-NCC/GO) towards nickel ion. The formation of CTA-NCC/GO nanocomposite has been confirmed by FT-IR. The SPR analysis result shows that the CTA-NCC/GO has high binding affinity towards Ni〈sup〉2+〈/sup〉 from 0.01 until 0.1 ppm with binding affinity constant of 1.620 × 10〈sup〉3〈/sup〉 M〈sup〉−1〈/sup〉. The sensitivity for the CTA-NCC/GO calculated was 1.509° ppm〈sup〉−1〈/sup〉. The full width at half maximum (FWHM), data accuracy (DA), and signal-to-noise ratio (SNR) have also been determined using the obtained SPR curve. For the FWHM, the value was 2.25° at 0.01 until 0.08 ppm and decreases to 2.12° at 0.1 until 10 ppm. The DA for the SPR curves is the highest at 0.01 until 0.08 ppm and lowest at 0.1 until 10 ppm. The SNR curves mirrors the curves of SPR angle shift where the SNR increases with the Ni〈sup〉2+〈/sup〉 concentrations. For the selectivity test, the CTA-NCC/GO has the abilities to differentiate Ni〈sup〉2+〈/sup〉 in the mixture of metal ions.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311016-ga1.jpg" width="266" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Chen Ma, Minrui Ma, Yida Zhang, Xinyue Zhu, Lin Zhou, Ran Fang, Xiaoyan Liu, Haixia Zhang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉It is found that hypobromous acid (HOBr) can affect the activity of type IV collagen. Herein, we synthesized a lysosome-targeted fluorescence probe 〈strong〉NA-lyso〈/strong〉 based on Suzuki coupling reaction with naphthalimide as a fluorescent group. HOBr can oxidize the amino group and methylthio group, which increased the degree of conjugation of the probe, thereby affecting its optical properties. Accordingly, it can establish a method for the specific detection of HOBr. 〈strong〉NA-lyso〈/strong〉 has the properties including fast response, high fluorescence quantum yield (Φ = 59.17%), high selectivity, low cytotoxicity and good membrane-permeability. The probe can locate to lysosome of cells. The potential of the probe as biosensor for HOBr was demonstrated by imaging of exogenous and endogenous HOBr in living cells and in mice. In consequence, 〈strong〉NA-lyso〈/strong〉 is expected to be a powerful tool to detect HOBr in complex biosystem and provides a means of exploring physiological functions associated with HOBr in living organisms.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310990-ga1.jpg" width="332" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Zohreh Alyaninezhad, Ahmadreza Bekhradnia, Nourollah Feizi, Sattar Arshadi, Mahmood Zibandeh〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A practical and an efficient Schiff base fluorescent chemosensor, salicylidene-4-aminoantipyrinyl-4-aminophenol (〈strong〉A2〈/strong〉) has been synthesized through the condensation procedure of 1-phenyl-2,3-dimethyl-4-(N-2-hydroxybenzylidene)-3-pyrazoline-5-one and 4-aminophenol. Compound 〈strong〉A2〈/strong〉 has displayed a considerable fluorescence enhancement with high selectivity and sensitivity toward Al〈sup〉3+〈/sup〉 ion and exhibited an emission band at 484 nm, which contained a low detection limit (LOD) of 1.06 × 10〈sup〉−7〈/sup〉 M. In accordance to the experimental study, DFT, TDDFT calculations, and the enhancement of fluorescence intensity might be attributed to the inhibition of Photoinduced Electron Transfer (PET) along with the Excited-State Intramolecular Proton Transfer (ESIPT). As it has been specified by Job's plot and DFT calculations, the binding stoichiometries of 〈strong〉A2〈/strong〉 with Al〈sup〉3+〈/sup〉 are 1:1, while the association constant (Ka) of Al〈sup〉3+〈/sup〉 has been calculated and observed to be 2.67 × × 10〈sup〉5〈/sup〉 M〈sup〉−1〈/sup〉. Furthermore, the binding behavior and sensing mechanism of 〈strong〉A2〈/strong〉 with Al〈sup〉3+〈/sup〉 have been confirmed through the experiments of 〈sup〉1〈/sup〉H NMR titration.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311053-ga1.jpg" width="273" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Xiong-jie Zhao, Yu-ren Jiang, Yu-ting Li, Bing-qing Yang, Ce Liu, Zhi-hong Liu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Hydrogen sulfide (H〈sub〉2〈/sub〉S) has been regarded as an important gas transmitter playing vital role in cytoprotective processes and redox signaling. It is very meaningful to monitor and analyze it in biosystem for obtaining important physiological and pathological information. Despite numerous fluorescent probes for cellular H〈sub〉2〈/sub〉S have been reported in past decades, only a few have capability to detect mitochondrial H〈sub〉2〈/sub〉S with near-infrared (NIR) emission. Therefore, a new mitochondria-targeting NIR fluorescent probe (〈strong〉Mito〈/strong〉-〈strong〉NSH〈/strong〉) for detection of cellular H〈sub〉2〈/sub〉S was developed by introducing 2,4-dinitrophenyl ether into a novel dye (〈strong〉Mito〈/strong〉-〈strong〉NOH〈/strong〉). A large “turn-on” NIR fluorescence response was obtained due to thiolysis of ether to hydroxyl group when 〈strong〉Mito〈/strong〉-〈strong〉NSH〈/strong〉 was treated with NaHS. Moreover, 〈strong〉Mito〈/strong〉-〈strong〉NSH〈/strong〉 could quantitatively detect H〈sub〉2〈/sub〉S at concentration ranging from 0 to 30 μM with a detection limit of 68.2 nM, and it exerts some superior optical properties, such as large stokes shift (107 nm), highly selectively mitochondria location, fast response and high selectivity to H〈sub〉2〈/sub〉S. More impressively, it was successfully applied to imaging exogenous and endogenously generated H〈sub〉2〈/sub〉S in living HeLa cells 〈em〉via〈/em〉 confocal fluorescence microscopy.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311168-ga1.jpg" width="379" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Yuan Wang, Hao Wu, Wei-Na Wu, Xian-Jie Mao, Xiao-Lei Zhao, Zhou-Qing Xu, Zhi-Hong Xu, Yun-Chang Fan〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A rhodamine hydrazone 〈strong〉1〈/strong〉 bearing coumarin moiety was designed and prepared. Compound 〈strong〉1〈/strong〉 exhibited high selectivity toward Co〈sup〉2+〈/sup〉 and trivalent metal ions with fluorescence enhancement in CH〈sub〉3〈/sub〉OH solution. However, 〈strong〉1〈/strong〉 selectively responded to Al〈sup〉3+〈/sup〉 in nearly pure H〈sub〉2〈/sub〉O media and was further applied to monitor Al〈sup〉3+〈/sup〉 in live cells. Moreover, 〈strong〉1〈/strong〉 could also act as a colorimetric probe toward Cu〈sup〉2+〈/sup〉 in either CH〈sub〉3〈/sub〉OH or H〈sub〉2〈/sub〉O solution. In addition, sensor 〈strong〉1〈/strong〉 displayed aggregation-induced ratiometric emission (AIRE) activities in mixed H〈sub〉2〈/sub〉O/CH〈sub〉3〈/sub〉OH solution.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310801-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 5 April 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 212〈/p〉 〈p〉Author(s): Bao-Li Wang, Dong-Qi Pan, Kai-Li Zhou, Yan-Yue Lou, Jie-Hua Shi〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Benazepril, a common ACE inhibitor, widely used in the treatment of arterial hypertension and congestive heart failure. In this study, We evaluated the characteristics of the interaction between benazepril and BSA under the simulated physiological condition (pH 7.4) through various spectroscopic and molecular docking methods. Fluorescence and absorption spectroscopy results showed benazepril quenched the intrinsic fluorescence of BSA through a combined dynamic and static quenching mechanism. The number of binding sites (〈em〉n〈/em〉) and the binding constant (〈em〉K〈/em〉〈sub〉b〈/sub〉) of benazepril–BSA complex were circa 1 and 6.81 × 10〈sup〉3〈/sup〉 M〈sup〉−1〈/sup〉 at 298 K, respectively, indicating that the binding affinity between benazepril and BSA was moderate. The displacement experiments confirmed that benazepril binding to the site I of BSA, which was quite in accordance with molecular docking. The values of the Gibbs free energy (ΔG〈sup〉0〈/sup〉), enthalpic change (ΔH〈sup〉0〈/sup〉) and entropic change (ΔS〈sup〉0〈/sup〉) were negative, verifying that van der Waals force and hydrogen bonding interaction played a predominant roles in the process of spontaneous bonding. Furthermore, a slight change of the conformation in BSA upon benazepril interaction was proved through SF, 3-DF and FTIR spectroscopy results.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518311107-ga1.jpg" width="427" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Lais Bukman, Camila Fabiano de Freitas, Wilker Caetano, Nádia Regina Camargo Fernandes, Noboru Hioka, Vagner Roberto Batistela〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉It is proposed a new approach to evaluate the performance of ultraviolet photoreactions by integrating UV-LED and a UV–Vis cuvette as a mini-reactor for kinetic monitoring in a spectrophotometer not influenced by external light. This system uses only 3.0 mL of solutions in a rectangular quartz cuvette with a mini-bar magnetic stirrer in a cell holder and a UV-LED of 5 W with λ〈sub〉max〈/sub〉 at 370 nm was positioned on the top of the cuvette and maintained at 25.0 〈sup〉o〈/sup〉C. The effectiveness of this photoreactor was demonstrated by measuring the real-time degradation of two model compounds, salicylic acid and methylene blue, in homogeneous and heterogenous systems. Photolysis of MB with H〈sub〉2〈/sub〉O〈sub〉2〈/sub〉 results in increasing of rate constants as [H〈sub〉2〈/sub〉O〈sub〉2〈/sub〉] increased. Heterogeneous photocatalysis of MB and SA was fastest achieved in ZnO dosage of 0,20 g.L〈sup〉–1〈/sup〉. This mini-photoreactor allows monitoring the real-time kinetic performance collecting almost a thousand points in each experiment, leading to accurate rate constants. Moreover, this system presented positive environmental aspects such as: lower reactants and catalyst amounts, lower cost and waste amounts, use of the UV-LED radiation and labor time saving. This is a novel approach to determine the photoreaction effectiveness and it can be applied to systematic studies especially for the kinetic parameter determinations.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S138614251831103X-ga1.jpg" width="437" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Xu Tang, Zhi Zhu, Renjie Liu, Liang Ni, Yue Qiu, Juan Han, Yun Wang〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉A novel fluorescence probe L2 based on coumarin has been designed and synthesized. The probe L2 can be used for relay recognition of metal ions Al〈sup〉3+〈/sup〉 and anion F〈sup〉−〈/sup〉 in the aqueous HEPES buffer (0.05 M, pH = 7.4), and build a OFF-ON-OFF detection system. The probe showed high selectivity and sensitivity to target ions in the process of relay recognition, and the corresponding detection limit could be as low as 0.014 μM (Al〈sup〉3+〈/sup〉) and 0.03 μM (F〈sup〉−〈/sup〉). Besides, the geometry optimizations of probe L2 and [L2 + Al〈sup〉3+〈/sup〉] complex were carried out using the Gaussian 16 program based on DFT, and the identification mechanism of the probe was also discussed by the mass spectrometry and theoretical calculations. Moreover, the probe has also been successfully applied to detection of target ions in living cells.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310849-ga1.jpg" width="500" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Jianting Yang, Jie Chai, Binsheng Yang, Bin Liu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The aggregation-induced emission (AIE) luminogens are now showing strong potential in mimicking the energy donor of fluorescence resonance energy transfer (FRET) system. Herein, one highly efficient FRET system 〈strong〉1〈/strong〉-NiR is successfully fabricated in aqueous solution based on an AIE active compound 〈strong〉1〈/strong〉 and fluorescence dyes (Nile red (NiR)). 〈strong〉1〈/strong〉 acts as the energy donor and NiR acts as the acceptor in the FRET system with the optimum concentrations ratio [〈strong〉1〈/strong〉]/[NiR] = 100. Besides, the AIE(〈strong〉1)〈/strong〉 itself displays excellent selectivity for Cu〈sup〉2+〈/sup〉 ions at 525 nm with the detection limit of 1.32 × 10〈sup〉−7〈/sup〉 M. While through the FRET system of 〈strong〉1〈/strong〉-NiR system, the detection limit of Cu〈sup〉2+〈/sup〉 can be further decreased to 9.12 nM by monitoring the fluorescence at 630 nm. As a result, using an AIE probe to detect Cu〈sup〉2+〈/sup〉 based on FRET mechanism is a promising strategy.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310837-ga1.jpg" width="423" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Emilio Meaurio, Eva Sanchez-Rexach, Amaia Butron, Jose-Ramon Sarasua〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The conformational behavior of chloramphenicol (CHL) in the solid, liquid and vapor phases is revisited here by means of FTIR spectroscopy and QM methods. In the crystalline phase, both the IR analysis and QM computations discard the conformer proposed by Acharya et al. (〈em〉Acta Cryst.,〈/em〉 1979, B35:1360–1363) and support the one proposed by Chatterjee et al. (〈em〉J. Cryst. Mol. Struct.,〈/em〉 1979, 9:295–304), characterized by an intramolecular O〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉H⋯O hydrogen bond in which the primary hydroxyl group acts as hydrogen bond donor. The conformational behavior of CHL in the liquid and gas phases has been analyzed using QM calculations. The Self-Consistent Reaction Field (SCRF) method with the Onsager solvation model has been used for the initial optimizations in solution, and the lowest energy conformers have been refined using the Solvation Model based on Density (SMD). In solution environment the intramolecular O〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉H⋯O hydrogen bond in CHL is reversed so that the secondary hydroxyl group acts as hydrogen bond donor. In addition, the dichloroacetamide group folds back further over the phenyl ring to form an intramolecular C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉Cl⋯π halogen bond. Two different halogen bonds are actually observed (each one with a different chlorine atom) resulting in two different stable conformers, that can be detected by FTIR spectroscopy due to the conformational sensitivity of the C〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/dbnd"〉O group to the conformation of the dichloroacetyl group. Finally, the stability of the conformers with the polarity of the medium is also discussed.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310795-ga1.jpg" width="301" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Tao Jia, Zhi-Hang Chen, Peng Guo, Junping Yu〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Two cationic δ,δ′‑diazacarbazoles, 1‑Methyl‑5〈em〉H〈/em〉‑pyrrolo[3,2‑〈em〉b〈/em〉:4,5‑〈em〉b〈/em〉′]dipyridinium iodide (〈strong〉MPDPI〈/strong〉) and 1,5‑Dimethyl‑5〈em〉H〈/em〉‑pyrrolo[3,2‑〈em〉b〈/em〉:4,5‑〈em〉b〈/em〉′]dipyridinium iodide (〈strong〉DPDPI)〈/strong〉, were devised and synthesized. Through characterizations of the interactions between DNA and the two δ,δ′‑diazacarbazoles by various spectroscopy means, the strong interactions between the two compounds and double-strand DNA have been observed and the interaction types and mechanisms were explored. UV–Vis and fluorescent data have shown the big changes of DNA in the presence of either of the two compounds, demonstrating that both of the δ,δ′‑diazacarbazoles can bind to DNA tightly, and high ionic strength decreased the intercalative interactions. The UV–Vis and fluorescence of dsDNA in the presence of 〈strong〉DPDPI〈/strong〉 showed more profound changes than those in the presence of 〈strong〉MPDPI〈/strong〉, due to 〈img src="https://sdfestaticassets-eu-west-1.sciencedirectassets.com/shared-assets/16/entities/sbnd"〉CH〈sub〉3〈/sub〉 (in the structure of 〈strong〉DPDPI〈/strong〉) taking place of H (in the structure of 〈strong〉MPDPI〈/strong〉) at the position of 5‑NH. And the circular dichroism (CD) spectra of CT-DNA and atomic force microscopy (AFM) results indicated more compacted conformation of DNA in the presence of 〈strong〉DPDPI〈/strong〉 than 〈strong〉MPDPI〈/strong〉, implying that 〈strong〉DPDPI〈/strong〉 has a more significant effect on DNA conformations than 〈strong〉MPDPI〈/strong〉. Most interestingly, fluorescence enhancement of cationic δ,δ′‑diazacarbazoles occurred in the presence of DNA. With ionic strength increasing, the intercalative interactions between δ,δ′‑diazacarbazoles and DNA were weakened, but δ,δ′‑diazacarbazoles-DNA complexes showed enhanced fluorescence, which indicated that there are other interactions present at high ionic strength. Furthermore, laser confocal fluorescence microscopy results proved that 〈strong〉DPDPI〈/strong〉 was membrane-permeable and stained living cells.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310758-ga1.jpg" width="301" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Hamideh Elmizadeh, Majid Soleimani, Farnoush Faridbod, GhasemRezanejade Bardajee〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉In this study, CdTe QDs were prepared in aqueous medium and then capped with a synthetic heterocycle ligand (CdTe/L QDs) via surface modification method. Characterization of synthesized CdTe/L QDs was carried out through various analytical techniques including fluorescence spectroscopy, transmission electron microscopy (TEM), UV–Vis spectrophotometry, thermo-gravimetric (TG) analysis and Fourier transform infrared (FTIR). The fluorescence intensity of the CdTe/L QDs at 520 nm (excitation at 380 nm) was selectively quenched in the presence of trace amounts of silver ions. CdTe/L QDs were utilized as an ultrasensitive and selective fluorescent sensor for determination of trace concentrations of silver ions with a detection limit of 6.12 ± 0.11 × 10〈sup〉−10〈/sup〉 mol L〈sup〉−1〈/sup〉 and a linear range of 2.04 ± 0.10 × 10〈sup〉−9〈/sup〉 mol L〈sup〉−1〈/sup〉–3.63 ± 0.12 × 10〈sup〉−7〈/sup〉 mol L〈sup〉−1〈/sup〉. The fabricated optical sensor was also used for the measurement of silver ions in real water samples which yielded satisfactory analytical results. These results were also evaluated with inductively coupled plasma emission spectroscopy (ICP-OES). This study shows that CdTe/L QDs could have potential applications in selective and sensitive analysis of different water samples for detection of silver ions.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310783-ga1.jpg" width="297" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Fei Guo, Clemens M. Altaner〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉Deuterium exchange combined with near infrared (NIR) spectroscopy was used to study the roles of accessible and inaccessible cellulose in the load transfer of eucalyptus wood. Monitoring the drying process helped to assign NIR bands of deuterated wood samples. Polarized NIR spectra of protonated and deuterated samples confirmed that inaccessible hydroxyl groups in eucalyptus wood were preferably oriented in the longitudinal direction. The spectral changes on NIR spectra caused by mechanical strain could be highlighted by averaging loading and unloading cycles to compensate for effects of desorption and isotope re-exchange due to environmental fluctuations. After deuteration, the bands affected by mechanical strain at around 6420, 6240 and 4670 cm〈sup〉−1〈/sup〉, which had been assigned to hydroxyl groups in cellulose, remained at these positions, suggesting the inaccessible cellulose fraction was the main load-bearing component in wood. A small band at around 4700 cm〈sup〉−1〈/sup〉 responding to mechanical strain, becoming visible in the deuterated spectra, indicated that accessible hydroxyls also contributed to the load transfer. Furthermore, the measurements confirmed previous reports of moisture adsorption of wood under tensile stress.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310746-ga1.jpg" width="352" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): K.S. Rao, D. Ganesh, F. Yehya, A.K. Chaudhary〈/p〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉The paper reports the potential use of UV based pulsed photoacoustic spectroscopy to study the thermal stability of some well-known premier explosives such as TNT, RDX, CL20, and ANTA between 30 and 350 °C range. The thermal PA spectra of samples were recorded using fourth harmonic wavelength i.e. 266 nm of pulse duration 7 ns and repetition rate 10 Hz obtained from Q-switched Nd: YAG laser system. Under the influence of UV radiation, the explosive molecules in vapor phase follow the photodissociation process and converted into their byproducts such as NO, NO〈sub〉2〈/sub〉 and N〈sub〉2〈/sub〉O etc. due to π* ← 〈em〉n〈/em〉 transitions, which are responsible for the generation resultant PA signal at 266 nm wavelength. The results obtained from PA spectra as a function of temperature are cross verified with Thermo gravimetric-differential thermal analysis (TG-DTA) to ascertain the thermal stability of these samples. The comparative PA spectra of samples were analyzed and shown the behavior of acoustic modes with respect to incident laser energy, and data acquisition time. Finally, the thermal quality factor “Q” is measured to test the stability of reported explosives.〈/p〉〈/div〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1386142518310734-ga1.jpg" width="237" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉

Description: 〈p〉Publication date: 15 March 2019〈/p〉 〈p〉〈b〉Source:〈/b〉 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 211〈/p〉 〈p〉Author(s): Sayed M. Saleh〈/p〉 〈div xml:lang="en"〉 〈h5〉Abstract〈/h5〉 〈div〉〈p〉This novel work presents a promising application to use Zinc oxide nanospheres as nanocatalysts in photocatalytic degradation of methyl orange dye. The hydrothermal route was utilized in the synthesis process of ZnO nanospheres. The size of the synthesized ZnO nanoparticles is around 200–250 nm diameter. The synthesized nano-oxides were characterized utilizing several instruments such as X-ray diffraction, Brunauer, Emmett, and Teller (BET), and scanning electron microscope (SEM). The resulting nanoparticles are utilized as an efficient tool for degradation of methyl orange (MO) dye under UV radiation. Essential parameters were studied on degradation process involving the initial concentration of MO, pH, stirring the solution, dose of the ZnO nanospheres, the oxygen content of the solution, calcination of the nanomaterials. All activity experiments under UV radiation provide excellent results for the degradation process of MO. Also, the recovery of ZnO nanomaterials was investigated based on the photocatalytic process efficiency. The results show the high possibility of reuse ZnO nanospheres for several photocatalytic processes. Also, the nanocatalysts were applied for a real environmental sample with providing high photocatalytic performance.〈/p〉〈/div〉 〈/div〉 〈div xml:lang="en"〉 〈h5〉Graphical Abstract〈/h5〉 〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S138614251831062X-ga1.jpg" width="311" alt="Unlabelled Image" title="Unlabelled Image"〉〈/figure〉〈/p〉〈/div〉 〈/div〉