Article ID Journal Published Year Pages File Type
28575 Journal of Photochemistry and Photobiology A: Chemistry 2006 6 Pages PDF
Abstract

Several bis(biphenyl)ethylenes and ethenes were prepared and their photoisomerization both in solution and in the solid-state was investigated. While all ethylenes and ethenes gave the solutions containing both E- and Z-isomers in the manner of the mutual photoisomerization, the ethylenes having at least one hydrogen atom on the sp2 carbons underwent unidirectional photoisomerization from the Z-isomers to the E-isomers in the solid-state even at low temperature. On the other hand, both the E- and Z-ethenes having no hydrogen atom on the double bonds did not change when irradiated in the solid-state even at room temperature. These different photochemical behaviors can be explained by the Hula-twist (HT) mechanism in such confined environments.

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