Raman spectrum of triglycine selenate (G3Se), [(NH2CH2COOH)3H2SeO4]

Balasubramanian, K. ; Krishnan, R. S. (1963) Raman spectrum of triglycine selenate (G3Se), [(NH2CH2COOH)3H2SeO4] Proceedings of the Indian Academy of Sciences, Section A, 58 (4). pp. 209-215. ISSN 0370-0089

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Official URL: http://www.ias.ac.in/j_archive/proca/58/4/209-215/...

Related URL: http://dx.doi.org/10.1007/BF03046382


The Raman spectrum of a single crystal of triglycine selenate G3Se which is ferroelectric below 22° C. has been photographed using λ 2537 excitation. 42 Raman lines have been recorded of which 6 belong to the lattice spectrum, 3 are due to NH..O oscillations and the remaining 33 are due to internal oscillations of the ions of glycine and SeO4--. There is a close similarity between the spectrum of triglycine selenate and the spectrum of its isomorph, triglycine sulphate, the frequency shifts due to the SO4-- ion being replaced by the frequency shifts due to the SeO4-- ion. The existence of glycine in the zwitterion form in the structure of G3Se is substantiated by the appearance in the Raman spectrum of lines which are attributable to NH3+ groups and COO- groups. The appearance of the additional C-H line at 2982 cm.-1 in the spectrum of triglycine selenate which is absent in the spectrum of α-glycine indicates the existence of planar monoprotonated glycine also in the structure, as indicated by X-ray studies.

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