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  • Analytical Chemistry and Spectroscopy  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative analysis of latex in paper coatings by ATR-FTIR spectroscopy (1994)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 8 (1994), S. 333-347 
    Details
    ISSN: 0886-9383
    Keywords: PLS ; ATR ; Paper ; Resolution ; Infrared ; FTIR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attenuated total reflectance Fourier transform infrared spectrometry (ATR-FTIR) has been used to determine the amount of styrene-butadiene latex on the surface of coated papers and to predict the composition of the polymer. Spectrum recording was performed on the sample in its usual form without any modification.For quantitative analysis, partial least squares (PLS) regression, principal component regression (PCR) and multi-linear regression (MLR) were used to calculate models for prediction. The best result is obtained with PLS.We analysed two series of paper samples. The first analysis concerns the measurement of the quantity of latex of a constant quality on the coating surface. For 15 samples the concentration varied between 5 and 25 parts (grams per 100g of mineral pigments). We compared the predictive results at various resolutions. We obtained a relative error of 0.15 parts in latex at 4 cm-1 resolution. The second analysis concerns the measurement of the styrene/butadiene ratio in various types of latex. We obtained a relative error of 0.156 parts for styrene determination and 0.161 parts for butadiene determination.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180080504
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  • 2
    Electronic Resource
    Electronic Resource
    Hindered rotation of the dimethylamino and dimethylthioamide groups in two ortho substituted N,N-dimethylthiobenzamides (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 54-56 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hindered rotation in two o-substituted N,N-dimethylthiobenzamides was investigated by variable temperature 1H NMR spectroscopy. For one compound, the enthalpies and entropies of activation for (i) thioamide group rotation around the Ar—C bond and (ii) dimethylamino group rotation around the C—N bond were obtained by full line shape analysis; a possible coupling between the two processes is discussed. A new simple method has also been applied to the analysis of dimethylamino exchange and results are in complete agreement with the full line shape analysis with somewhat better precision.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070113
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  • 3
    Electronic Resource
    Electronic Resource
    Raman spectra of 1-organosilatranes (1983)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 14 (1983), S. 135-137 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of five organosilatranes (R = H, CH3, (CH2)3NH2, OC2H5 and F) are reported. The normal modes of the cage are presented and the assignment of the Si-N stretching mode is discussed on the basis of C3ν symmetry for the silatrane skeleton.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250140302
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental observation of the Raman spectrum of 1-Methylsilatrane hydrochloride (1984)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 15 (1984), S. 293-295 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectrum of 1-methylsilatrane hydrochloride has been recorded. The disappearance of the 354 cm-1 band, found in the spectrum of 1-methylsilatrane, is in agreement with the assignment of this vibration to the Si—N stretching mode on the basis of a previous a priori normal coordinate treatment.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250150417
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  • 5
    Electronic Resource
    Electronic Resource
    Spectres de Vibration et Structure de l'Octamethylcyclotetrasilazane [(CH3)2SiNH]4 dans les Etats Gazeux, Liquide et Cristallin (1977)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 6 (1977), S. 273-276 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared and Raman spectra of octamethylcyclotetrasilazane [(CH3)2SiNH]4 are reported for the compound in the gaseous and liquid states and for solutions in CCl4. 21 Raman bands have been observed for the first time. They are assigned on the basis of group frequencies. Their temperature dependence does not reveal any favoured conformation. Raman spectra of both polycrystalline powders and single crystals are well explained if the existence of chair and boat forms is assumed, according to X-ray results.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250060603
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  • 6
    Electronic Resource
    Electronic Resource
    Electron-transfer self-exchange of trimethylphosphine-modified cytochrome c: NMR study and kinetics using spin-lattice relaxation times (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. S23 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; NOESY ; Cytochrome c ; Trimethylphosphine ; Electron transfer ; Self-exchange ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding of trimethylphosphine to the axial position of the haeme iron in modified cytochrome c by alkylation of methionine was studied by NMR spectroscopy. Electron self-exchange was determined by spin-lattice relaxation time (T1) measurement. The rate is 7.5 × 103 1 mol-1 s-1 at 25°C in 0.1 M phosphate buffer (pH 7.0). Two-dimensional transfer spectroscopy was used to locate haeme methyl resonances in both iron(II) and iron(III) complexes of modified cytochrome c.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260311307
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