Vibrational spectra and stereochemistry of mono- and polysaccharides. III. β-methyl-d-glucoside, α-methyl-d-glucoside,and β-methyl-d-xyloside |
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Authors: | R G Zhbankov V M Andrianov H Ratajczak M Marchewka |
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Abstract: | The IR and Raman spectra of β- and α-methyl-D-glucosides and β-methyl-D-xyloside are compared. Experimental data are correlated
with theoretical calculations of the frequencies of normal vibrations. Predominant contributions (20% and more) of particular
CiOi and CiC(i+1) bonds to the potential energy distribution of normal vibrations (i.e., localization of vibrations on these
bonds, which form skeletons of monosaccharide molecules) are estimated. This approach is used to interpret the main distinctions
between the IR and Raman spectra of the test compounds. The use of vibrational spectra in selective analysis of certain functional
groups is discussed. It is shown that replacing the hydroxyl group at C1 has a specific effect on the predominant localization
of vibrational modes in particular skeletal bonds (mainly in C1O1) of the monosaccharide molecules.
B. I. Stepanov Institute of Physics, Belarus Academy of Sciences. V. Tshebyatovski Institute of Low Temperatures and Structural
Studies, Polish Academy of Sciences. Translated fromZhurmal Strukturnoi Khimii, Vol. 36, No. 3, pp. 443–455. May–June, 1995.
Translated by I. Izvekova. |
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