Styrene and phenylacetylene: Electronic effects of conjugating substituents ``off'' and ``on'' the axis of a benzene ring
Styrene and phenylacetylene: Electronic effects of conjugating substituents ``off'' and ``on'' the axis of a benzene ring
复制标题
DOI：
10.1063/1.480186
复制
发表时间：
1999-10
影响因子：
4.4
通讯作者：
J. W. Ribblett;D. R. Borst;D. Pratt
中科院分区：
文献类型：
--
作者：
J. W. Ribblett;D. R. Borst;D. Pratt
Rotationally resolved fluorescence excitation spectra of several vibronic bands in the S1←S0 electronic transitions of styrene (STY) and phenylacetylene (PA) have been obtained. Confirming earlier low resolution results, we find that the origin band of PA is a b-type band but that the corresponding band of STY is an a-type band, showing that the S1 state of PA is 1Lb in character (like that of most other monosubstituted benzenes) but that the corresponding state of STY is 1La. The observed changes in the rotational constants of PA and STY that occur when the photon is absorbed are consistent with these assignments. Reversal in the electronic character of the S1 state in STY is attributed to the presence of the “off-axis” conjugating –CH=CH2 group, a suggestion that is supported by the observed polarizations of higher vibronic bands in both molecules.
