S. Yanagida, M. Hanazawa, A. Kabumoto
Feb 1, 1987
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Influential Citations
5
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Journal
Synthetic Metals
Abstract
Abstract The use of poly(thiophene)(PT) or poly(p-phenylene)(PPP) as photocatalysts induces a quantitative cis-trans photoisomerization of the 2-octenes under visible light irradiation. Photostationary cis-trans ratios are almost identical with the thermodynamic equilibrium ratios achieved by the trapped holes on UV-irradiated ZnS or the phenylthio radical. The activity of PT is enhanced by the presence of water and is proportional with the increase of the ESR signal observed at g=2.003. Langmuir-Hinshelwood and Freundlich kinetkic treatments reveal that the present photoisomerization occurs at adsorbed states and the surface of catalysts does not provide an active species like alkene cation radicals. The presence of oxygen inhibits the reaction. The mechanism mediated by the photoformed polaron states (photoformed radical cation) is proposed.