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Infrared and Raman spectroscopic studies of L ‐valinium picrate
Author(s) -
Senthilkumar S.,
Briget Mary M.,
Ramakrishnan V.
Publication year - 2007
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/jrs.1641
Subject(s) - picrate , raman spectroscopy , chemistry , hydrogen bond , fermi resonance , infrared , intermolecular force , crystallography , protonation , infrared spectroscopy , crystal (programming language) , crystal structure , photochemistry , ion , molecule , organic chemistry , optics , physics , computer science , programming language
Abstract The vibrational assignments of the observed wavenumbers have been made by analyzing the infrared and Raman spectra of L ‐valinium picrate in the crystalline state at room temperature. L ‐Valinium acts as the cation of the crystal and the carbonyl CO group exists in the protonated form in it. Asymmetric deformation and symmetric deformation modes of the isopropyl group have been identified, indicating that the two CH 3 groups are in different environments. The stretching and bending modes of the various functional groups have been shifted owing to the extensive intermolecular hydrogen bonding in the crystal. The symmetry of the picrate anion has not been modified in the crystal by the hydrogen bonding with the cation. Fermi resonance is also observed. Copyright © 2006 John Wiley & Sons, Ltd.