Abstract
The mechanisms for Z-E photoisomerization of two bisstilbenes, 4,4'-bis(3,5-di-tert-butylstyryl)bibenzyl, 1, and [2.2]-4,4'-stilbenophane, 2, have been studied. The isomerizations of ZZ-1 and EE-1 are similar to those of Z- and E-stilbene, respectively. On excitation of ZE-1 there is a competition between an energy transfer process from the E- to the Z-chromophore and isomerization. This results in a small quantum yield (<0.01) for isomerization of ZE-1 to ZZ-1, whereas that of ZE-1 to EE-1 is 0.19
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