Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 195, Issue 2-3, Pages 301-306Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2007.10.016
Keywords
1,2-distyrylbenzene; thio-1,2-distyrylbenzenes; photoreaction mechanism
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The radiative and reactive excited state relaxations of the ZE and ZZ geometrical isomers of 1,2-distyrylbenzene [1,2-(PhE)ZB] and two hetero-analogues, where the side phenyl groups were replaced by 4'-pyridyl or 2'-thienyl groups, were studied and compared with the photobehaviour of the EE isomers previously investigated. The ZE and ZZ isomers of the hydrocarbon photoisomerize by a predominant adiabatic mechanism (a one photon - two bonds process is also operative in the case of ZZ) whereas the contribution of the adiabatic pathway is reduced for the thienyl-analogues, which isomerize by a mixed (diabatic/adiabatic) mechanism, whereas a prevalent diabatic mechanism characterizes the behaviour of the pyridyl analogue. (C) 2007 Elsevier B.V. All rights reserved.
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