Vibrational dephasing of the croconate dianion in different environments
Article first published online: 15 AUG 2005
Copyright © 2005 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 36, Issue 10, pages 996–1000, October 2005
How to Cite
Cavalcante, A. O. and Ribeiro, M. C. C. (2005), Vibrational dephasing of the croconate dianion in different environments. J. Raman Spectrosc., 36: 996–1000. doi: 10.1002/jrs.1396
- Issue published online: 22 SEP 2005
- Article first published online: 15 AUG 2005
- Manuscript Accepted: 10 JUN 2005
- Manuscript Received: 30 MAR 2005
- oxocarbon ions;
- Raman band shape;
- vibrational dephasing
Raman band-shape analysis of croconate dianion, C5O52−, was performed in order to reveal the short-time dynamics of this species in different environments: aqueous solution, acetonitrile solution, and the low-temperature molten salt tetra(n-butyl)ammonium croconate, [(n-C4H9)4N]2C5O5·4H2O, TBCR. Two totally symmetric normal modes were investigated, the CO stretching, ν1, and the ring breathing, ν2. Vibrational dephasing parameters for ν1 and ν2 display very different behaviour on changing the environment in which the C5O52− moiety is located. A quantitative explanation of the changes in parameters is not yet available, but it is argued that strong hydrogen bond with water molecules is the origin of the very different dephasing dynamics of C5O52− in aqueous solution in comparison with acetonitrile solution and TBCR. Thus, experimental vibrational time correlation functions nicely illustrate distinct sensitivity of different intramolecular oscillators of the solute to intermolecular dynamics, that is, distinct coupling between intra- and intermolecular degrees of freedom. Copyright © 2005 John Wiley & Sons, Ltd.