CONFORMATIONAL ANALYSIS AND INTERNAL ROTATION OF PARA-SUBSTITUTED METHYL-TRANS-STILBENES.
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Date
1993
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Publisher
Ohio State University
Abstract
The fluorescence excitation and dispersed fluorescence spectra for supersonically cooled p-methoxy-trans-stilbene, p'-methoxy-p-methyl-trans-stilbene and other para-substituted methyl-trans stilbenes will be presented. Two conformations for the methoxy group are observed, with the inequivalence of the origins manifested as differences in the frequencies of typical stilbene vibrations and in the barrier height for internal rotation of the methyl group. Substitution in the para-position on the far ring with electron-donating and electron-withdrawing groups leads to $\pi$-effects that systematically affect the rotation of the methyl group.
Description
Author Institution: Department of Chemistry, Montana State University