期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 59, 期 12, 页码 2883-2896出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1386-1425(03)00100-8
关键词
modified Urey-Bradley-Shimanoushi force field; normal modes analyses; vibrational spectra; methyl-D-galactopyranoside
类别
The study of the anomeric differences observed on the spectra of methyl-alpha- and methyl-beta-D-galactopyranoside is the essential goal of this investigation. Thus, after a careful examination of the IR and Raman spectra of these two compounds, several differences in the intensities and frequency shifts are observed. This is especially noted in the region 1000-700 cm(-1). In order to make some assignments with more precision, the normal modes analyses of the two compounds are performed in the crystalline state. For this purpose, a modified Urey-Bradley-Shimanouchi force field has been combined with an intermolecular potential energy function. The initial set of force constants comes from those of alpha- and beta-D-galactopyranosyl, then the force constants have been varied, so as to obtain a good agreement between the observed and the calculated vibrational frequencies. The obtained results have finally reproduced the experimental data and have confirmed the previous assignments made for the methyl-alpha- and methyl-beta-D-galactopyranoside. The calculations have demonstrated also the transferability of the set of parameters of the initial force field of D-galactose to methyl-D-galactopyranoside. (C) 2003 Elsevier Science B.V. All rights reserved.
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