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Vibrational spectral studies of dinicotinium sulfate

S.Jegannathan, M.Briget Mary, V.Ramakrishnan, S.Thangadurai

This article describes the vibrational spectra of Dinicotinium sulfate. The Raman and infrared absorption spectra of Dinicotinium sulfate crystal containing two anions were recorded at room temperature and the vibrational assignments of the observed wave numbers are made. The presence of a carbonyl (C=O) group was identified and the two carbonyl groups are in different environment. The extensive intermolecular hydrogen bonding in the crystal has been identified by the shifting of bands due to the stretching and bending modes of the various functional groups. The sulfate group forms the anion. Its fundamentals continue to be degenerate except for the asymmetric bending mode and it suggests that the Td symmetry of SO4 2- group has not been affected in the crystal. Factor group analysis was also carried out for the Dinicotiniumsulfate crystal to explore the possible vibrational modes.