de Villepin, J. ; Limage, M. -H. ; Novak, A. ; Toupry, N. ; Le Postollec, M. ; Poulet, H. ; Ganguly, S. ; Rao, C. N. R. (1984) Raman study of the high-temperature phase transition of malonic acid Journal of Raman Spectroscopy, 15 (1). pp. 41-46. ISSN 0377-0486
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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/jrs.125...
Related URL: http://dx.doi.org/10.1002/jrs.1250150110
Abstract
The Raman spectra of the high-temperature (α) phase of crystalline malonic acid, CH2(COOH)2, and its deuteriated derivative, CD2(COOD)2, have been investigated at 370 K in the wavenumber shift range 0-4000 cm−1. An assignment of the internal and external vibrations is given. Comparison of the infrared and Raman spectra of the α and β phases shows that the high-temperature phase ( α) consists of quivalent centrosymmetric dimer rings and that the corresponding space group is C62h—C2/c with molecules occupyging C2 sites. The temperature dependence of various Raman lines, in particular those due to lattice modes, indicates that the phase transition is of first order and that during the transition, reorientation of the molecules about the c axis is strongly coupled with the low-frequency torsional (γOH...O) and librational modes.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley and Sons. |
ID Code: | 39965 |
Deposited On: | 20 May 2011 09:39 |
Last Modified: | 20 May 2011 09:39 |
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