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Raman spectroscopic study of the conformational equilibrium of liquid 3-fluorostyrene

✍ Scribed by P. J. A. Ribeiro-Claro; J. J. C. Teixeira-Dias

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
457 KB
Volume
24
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

The Raman spectra of liquid 3‐fluorostyrene show pairs of bands whose temperature‐dependent intensities clearly suggest the occurrence of a conformational equilibrium. From these bands, assigned to cis and trans conformers, a trans–cis energy difference of 0.70 ± 0.20 kJ mol^−1^ was obtained for the liquid phase, higher than the reported gas‐phase microwave and ab initio values. The effects of dilution with several solvents of different polarity properties are reported and the improved relative stability of the cis form in high‐polarity solvents is interpreted in terms of medium effects on intramolecular through‐space dipole–dipole interactions.

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