Abstract
The infrared absorption spectra of glycine silver nitrate (GAgNO3) and glycine nitrate (GHNO3) show that the glycine group exists completely in the zwitter ion form in the former and in both forms in the latter. The spectrum of GAgNO3 at liquid air temperature did not reveal any striking change which can be attributed to a freezing of the rapid reorientation of the NH +3 group taking place at higher temperatures. The position of the COO− stretching frequencies indicate that this group is co-ordinated only weakly to the Ag+ ion. The summation frequencies reported by Schroeder, Wier and Lippincott (1962) for AgNO3 were not observed in the present study on GAgNO3. It shows however that ferroelectricity in GAgNO3 is in all probability due to the motion of the Ag+ ion in the oxygen co-ordination polyhedron and is not directly connected with the ordering of the hydrogen bonds below Curie point.
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Communicated by Prof. R. S. Krishnan,f.a.sc.
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Warrier, A.V.R., Narayanan, P.S. Infrared absorption spectra of single crystals of glycine silver nitrate and monoglycine nitrate. Proc. Indian Acad. Sci. 66, 46–54 (1967). https://doi.org/10.1007/BF03049408
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DOI: https://doi.org/10.1007/BF03049408