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A spectroscopic resolution of the structure of Zn(CN)2

✍ Scribed by T. R. Ravindran; A. K. Arora; T. N. Sairam

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
257 KB
Volume
38
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

Two different cubic structures of the negative thermal expansion (NTE) material zinc cyanide have been reported in the literature: one, an ordered structure (space group P__43__m) in which the ZnC~4~ tetrahedra are linked to neighbouring ZnN~4~ tetrahedra with CN bonds and vice versa, and the other, a disordered structure (space group Pn__43__m) where N and C sites are indistinguishable. Here, we present group theoretical analyses to classify the phonons of different symmetries in the two structures and report Raman and infrared spectroscopic studies to resolve the ambiguity about the structure. On the basis of the number of Raman and IR modes expected and observed, we conclude that the compound exists in a disordered structure. Copyright Β© 2006 John Wiley & Sons, Ltd.

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