Title:	Polymorphism of the smectogen ethyl-p-azoxybenzoate: Far-infrared and Raman study
Authors:	Venugopalan, S. Prasad, S.N.
Issue Date:	1-Apr-1980
Publisher:	The American Institute of Physics
Citation:	Journal of Chemical Physics, 1980, Vol.72, p4153-4157
Abstract:	The far-infrared spectra of the different phases of ethyl-p-azoxybenzoate have been studied in the 30–210 cm–1 range. Distinct differences are observed between the spectra of the two crystalline polymorphs that are stable above and below 102 °C, solid I and solid II, respectively. The spectrum of solid I resembles that of the isotropic phase, while that of the smectic phase is highly broadened. These results are discussed in terms of the structure, molecular conformation, and packing obtaining in the different phases. In the region of the internal modes, the same Raman frequencies are observed in both polymorphs although relative intensity changes occur for several lines. From a comparison of the Raman line shapes corresponding to the N–O and N–N bond stretching vibrations in solid II and solid I, we conclude that in the latter case the reorientations of the azoxy group occur at a rate too slow to affect the vibrational relaxation of these modes.
URI:	http://hdl.handle.net/2289/1266
ISSN:	0021-9606
Alternative Location:	http://link.aip.org/link/?jcp/72/4153
Copyright:	(1980) by the American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:	Research Papers (SCM)

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