Abstract
The infrared and laser-excited Raman spectra of bis(DL-methioninium) sulfate crystal were recorded and analyzed at room temperature. The vibrational assignments of the observed wavenumbers were made based on group theoretical analysis. The presence of CO group is confirmed. Factor group analysis was carried out and the number of normal vibrational modes was calculated. The shifting of several stretching and bending wavenumbers suggests that the extensive intermolecular hydrogen bonding causes both linear and angular distortions of several groups. The splitting of the threefold degenerate stretching and bending modes of the sulfate group confirms the distortion of its Td symmetry due to hydrogen bonding. Copyright © 2005 John Wiley & Sons, Ltd.
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