Photochemistry and photophysics of donor-acceptor-polyenes.: I:: all-trans-4-dimethylamino-4′-cyano-1,4-diphenylbutadiene (DCB)

被引：28

作者：

Braatz, H

Hecht, S

Seifert, H

Helm, S

Bendig, J

Rettig, W

机构：

[1] Humboldt Univ, Inst Chem, D-10115 Berlin, Germany

[2] Humboldt Univ, Inst Chem, D-10117 Berlin, Germany

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1999年 / 123卷 / 1-3期

关键词：

photochemistry; fluorescence; polyenes; diphenylbutadiene; donor-acceptor; catalysis;

D O I：

10.1016/S1010-6030(99)00024-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dimethylamino-cyano-diphenylbutadiene (DCB) has been investigated using photochemical and photophysical techniques. HPLC analysis enabled the separation of two photoisomers. Their absorption spectra and extinction coefficients were determined by combining the diode array spectra with the isosbestic points observed in photolysis. The forward and backward quantum yields of photoisomerization were determined. The quantum-chemical modelling of these spectra allowed for a tentative assignment of the photoisomers to the mono-cis isomers ct and tc. Fluorescence lifetimes and quantum yields allowed the conclusion of a negative solvatokinetic behaviour of the nonradiative decay. Catalyzed thermal isomerization of DCB was observed on reversed-phase chromatographic material. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：99 / 108

页数：10

共 54 条

[1] Photophysics of 4-dimethylamino 4'-cyanostilbene and model compounds: Dual excited states revealed by sub-picosecond transient absorption and Kerr ellipsometry [J].