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  • Articles  (302)
  • Springer  (302)
  • American Chemical Society
  • American Chemical Society (ACS)
  • American Geophysical Union
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  • 2015-2019  (302)
  • 2005-2009
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  • 2017  (302)
  • Journal of Fluorescence  (108)
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  • Physics  (302)
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  • Articles  (302)
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  • Springer  (302)
  • American Chemical Society
  • American Chemical Society (ACS)
  • American Geophysical Union
  • National Academy of Sciences
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  • 2015-2019  (302)
  • 2005-2009
  • 1990-1994
  • 1980-1984
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  • Physics  (302)
  • 1
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    Preparation of Highly Biocompatible ZnSe Quantum Dots Using a New Source of Acetyl Cysteine as Capping Agent (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: In this paper, we describe a facile method for preparation of ZnSe quantum dots (QDs) using an inexpensive and biocompatible source of acetyl cysteine in aqueous media. The structural properties of the ZnSe QDs have been characterized using XRD, FT-IR, and TEM techniques. The optical properties of the as-prepared QDs were found to be size-dependent, due to the strong confinement regime at relatively low refluxing time. Effect of solution pH and refluxing temperature on absorption and emission characteristics of the ZnSe QDs was studied. The empirical effective mass approximation also reveals that, both solution pH and refluxing temperature parameters would effect on ZnSe QDs growth, and increase their size. However, the influence of the solution pH was found to be more prominent. Water-solubility, high emission intensity and sub-10 nm nanocrystals size are the most essential features that suggest our synthesized aqueous-based ZnSe QDs (with a very cost-effective and biocompatible capping agent) can be utilized for biological intentions.
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    Electronic ISSN: 1573-4994
    Topics: Physics
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  • 2
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    New Fluorescent and Colorimetric Chemosensor for Detection of Cyanide with High Selectivity and Sensitivity in Aqueous Media (2017)
    Springer
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    Publication Date: 2017-02-11
    Description: A fluorescent and colorimetric chemosensor for detection of cyanide ion based on a styryl quinoline derivative has been designed and synthesized. The chemosensor ( E )-2-(4-mercaptostyryl)quinolin-8-ol L showed high selectivity for detection of cyanide over other anions such as F¯, Cl¯, Br¯, I¯, NO 3 ¯, SCN¯, N 3 ¯, ClO 4 ¯, H 2 PO 4 ¯, AcO¯, HCO 3 ¯, SO 4 2 ¯ and HSO 4 ¯in aqueous solution. The chemosensor L displayed an immediate visible and fluorescence changes from nearly colorless to orange and greenish-blue to brick-red upon addition of cyanide ion respectively. It is more likely, these distinct changes can be attributed to hydrogen bonding interaction between phenol group and cyanide anion leading to a 1:1 binding stoichiometry following with deprotonation of phenol group. The detection limit for chemosensor L toward CN¯ was 2.73× 10 −8  M. Thus, the chemosensor can be used efficiently and selectively for detection and monitoring of small amounts of cyanide ion in aqueous media.
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  • 3
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    Photostability of Coumarin Laser Dyes - a Mechanistic Study Using Global and Local Reactivity Descriptors (2017)
    Springer
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    Publication Date: 2017-02-18
    Description: Using density functional theory approach, the trend in photostability of fluorescent coumarin laser dyes were investigated with the help global reactivity descriptors. The effect of different basis sets on global reactivity descriptors i.e. electrophilicity index (ω) is studied. The local reactivity descriptors such as Fukui function, local softness and local electrophilicity index have been used to understand the reactive site in the molecule. Photodegradation mechanism of fluorescent coumarin laser dyes in presence of singlet oxygen is explained using density functional theory.
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  • 4
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    Porphyrin-Based Dye-Sensitized Solar Cells (DSSCs): a Review (2017)
    Springer
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    Publication Date: 2017-02-18
    Description: The current review aims to collect short information about photovoltaic performance and structure of porphyrin-based sensitizers used in dye-sensitized solar cells (DSSC). Sensitizer is the key component of the DSSC device. Structure of sensitizer is important to achieve high photovoltaic performance. Porphyrin derivatives are suitable for DSSC applications due to their thermal, electronic and photovoltaic properties. It describes some electrochemical and spectral properties as well as thestructure of porphyrin dyes used in dye based-solar cells.
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  • 5
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    Synthesis, Characterization and DNA-Binding Studies of Hydroxyl Functionalized Platinum(II) Salphen Complexes (2017)
    Springer
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    Publication Date: 2017-02-22
    Description: The platinum(II) salphen complex N,N′ -Bis-4-(hydroxysalicylidene)-phenylenediamine-platinum(II); (1) and its two derivatives containing hydroxyl functionalized side chains N,N′ -bis-[4-[[1-(2-hydroxyethoxy)] salicylidene] phenylenediamine-platinum(II); (2) and N,N′ -bis-[4-[[1-(3-hydroxypropoxy)] salicylidene] phenylenediamine-platinum(II); (3) were synthesized and characterized. The structures of the complexes were confirmed by 1 H and 13 C NMR spectroscopy, FTIR, ESI-MS and CHN elemental analyses. The effects of the hydroxyl substituent on the spectral properties and the DNA binding behaviors of the Pt(II) complexes were explored. The binding mode and interactions of these complexes with duplex DNA (calf thymus DNA and porcine DNA) and also single-stranded DNA were studied by UV-Vis and emission DNA titration. The complexes interact with DNA by intercalation binding mode with the binding constants in the order of magnitude (K b  = 10 4  M −1 , CT-DNA) and (K b  = 10 5  M −1 , porcine DNA). The intercalation of the complex in the DNA structure was proposed to happen by π-π stacking due to its square-planar geometry and aromatic rings structure. The phosphorescence emission spectral characteristics of Pt(II) complexes when interacted with DNA have been studied. Also, the application of the chosen hydroxypropoxy side chains complex (3) as an optical DNA biosensor, specifically for porcine DNA was investigated. These findings will be valuable for the potential use of the platinum(II) salphen complex as an optical DNA biosensor for the detection of porcine DNA in food products.
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  • 6
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    Photophysics of EGFP (E222H) Mutant, with Comparisons to Model Chromophores: Excited State pK’s, Progressions, Quenching and Exciton Interaction (2017)
    Springer
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    Publication Date: 2017-02-22
    Description: A novel version of the well-known and commercially successful Green Fluorescent Protein (GFP) variant known as EGFP, with an introduced E222H mutation, was produced in this laboratory. Given the current state of hypotheses about the role of glutamate 222, and the observed dominance of the phenolate absorption with an E222H variant observed from earlier study, the new mutant was considered a natural choice to investigate more fully the acid-base behavior of the chromophore in absorption and fluorescence. The bulk of this investigation concerns fitting the excitation, emission and absorption spectra to vibrational progressions of a novel ‘q-deformed’ type at various values of pH, and protein concentration. From these data, and from temperature-dependent fluorescence lifetime data and other experiments (with lanthanide doped gels into which H/EGFP is embedded), we construct a picture of excited inter- state conversion mechanisms, and quenching mechanisms, that attempts to explain many features of the GFP system. Graphical Abstract Hypothetical proton current loop (orange) upon excitation; electron motion in purple H/EGFP. Solid boxes about waters project toward viewer, dashed boxes project away
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  • 7
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    Rhodamine Diaminomaleonitrile Conjugate as a Novel Colorimetric Fluorescent Sensor for Recognition of Cd 2+ Ion (2017)
    Springer
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    Publication Date: 2017-02-22
    Description: Rhodamine diaminomaleonitrile linked probe ( RD-1 ) shows highly sensitive colorimetric and selective turn-on fluorescent response to Cd 2+ over other metal ions. The fluorescence intensity and absorbance of the probe RD-1 showed a good linearity, with very low detection limits of 18.5 nm. The probe RD-1 was preliminarily applied to the determination of Cd 2+ ion in water samples from river and tap water with satisfying results. The live cell image confocal microscopy, HeLa cell demonstrated that RD-1 had low cytotoxicity with good membrane permeable property is successfully applied to fluorescence microscopic imaging for the detection of Cd 2+ ions.
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  • 8
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    Organocatalytic Fluorogenic Synthesis of Chromenes (2017)
    Springer
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    Publication Date: 2017-02-22
    Description: Two fluorescent derivatives of 2-amino-3-carbonitrile-4H-chromene were synthesized by means of a fluorogenic Michael addition of dimedone to dicyano alkene labeled BODIPY derivatives. Different organocatalysts were used in different conditions to obtain compounds 3 and 4 in good yield (up to 65% and 85%) and moderate enantiomeric excess (51% and 41% ee, respectively). This work provides the first example of an enantioselective organocatalytic conversion combined with fluorogenesis.
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  • 9
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    Benzocoumarin-Styryl Hybrids: Aggregation and Viscosity Induced Emission Enhancement (2017)
    Springer
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    Publication Date: 2017-05-13
    Description: Two benzo[h]chromen-3-yl)ethylidene) malononitrile styryl hybrid dyes are synthesized and characterized by NMR and elemental analysis. One is based on nitrogen donor and other on oxygen ( 3b and 3b respectively ) . Dyes are low emissive in the solution but dramatically showed increase in emission intensity in aggregates form in the THF ( tetrahydrofuran ) /water system. Dyes are also sensitive to viscosity and showed increased emission intensity in the DCM:PEG 400 system and DMF:PEG 400 system respectively. Dyes 3a and 3b showed higher viscosity sensitivity constant (0.67 and 0.39 respectively) in DMF:PEG 400 system compared to DCM:PEG 400 (0.47 and 0.21 respectively) system which is contrary to the traditional concept of FMRs. Results shows that lowering of twisted intramolecular charge transfer (TICT) and increase in intramolecular charge transfer (ICT) in the excited state could be the reason for such behavior in the aggregate and highly viscous state. This study may provide the new insights into the field of AIEE and FMR research of such hybrid molecules.
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  • 10
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    Tunable and Nontoxic Fluorescent Probes Based on Carbon Dots for Imaging of Indole Propionic Acid Receptor in Plant Tissues in Situ (2017)
    Springer
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    Publication Date: 2017-05-17
    Description: Indole propionic acid (IPA) is one of the important plant growth hormones for promoting rooting and fruiting. Labeling IPA receptor in plant tissues is able to further track the signal transduction processes of IPA and uncover the function mechanism of IPA on crop productions. In this paper, a tunable and nontoxic fluorescent probe for IPA receptors was designed and synthetized base on carbon dots (C dots). Firstly carboxyl-modified carbon dots were prepared by high temperature cracking of citric acid. The fluorescence emission wavelengths of C dots varied with the excitation wavelengths change. Then IPA-modified carbon dots (IPA-C dots) were prepared by coupling the amino of tryptophan with the carboxyl of as-prepared carbon dots. Compared with C dots, the fluorescence intensity of IPA-C dots was double and the fluorescence stability was satisfactory under various conditions. This probe retained the biological activity of IPA and acted as target recognition of IPA receptors in plant tissues. The probe could avoid green fluorescence background of plants. The imaging results showed that the IPA receptors mainly existed on the membrane of stele. The toxicity test indicated the probe was less toxic than traditional inorganic semiconductor quantum dots.
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