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Infrared and Raman spectra of DL ‐histidinium dinitrate and L ‐histidinium sulphamate
Author(s) -
Rajkumar Beulah J. M.,
Ramakrishnan V.,
Bahadur S. Asath
Publication year - 1999
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199907)30:7<589::aid-jrs424>3.0.co;2-#
Subject(s) - raman spectroscopy , chemistry , infrared , spectral line , analytical chemistry (journal) , physics , environmental chemistry , optics , astronomy
A comparative study of the infrared and Raman spectra of DL ‐histidinium dinitrate and L ‐histidinium sulphamate helps in determining the effect of hydrogen bonding in these crystals. The nitrate compound has a carboxylic group whereas the sulphamate compound has an ionized carboxyl group. However, the protonated imidazolium ring makes the histidine group in both cases ionic. Several group wavenumbers have been shifted in both molecules, indicating extensive hydrogen bonding. Some of the forbidden modes of the nitrate group have been observed. The removal of degeneracy of certain modes of both the nitrate and sulphamate anions suggests that the symmetry of both of these groups have been affected in their respective environments. Copyright © 1999 John Wiley & Sons, Ltd.