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Trans → cis photoisomerization of 1-(9-anthryl)-2-(4-R-phenyl)ethylene, R: CH3 and OCH3

✍ Scribed by Licheng Sun; Helmut Görner

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 412 KB
Volume: 208
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)80074-y

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✦ Synopsis

The quantum yields of fluorescence, triplet formation and trans-+cis photoisomerization (@r, 0r and @_,) of the title compounds (H,C-and H&O-StA) were measured in several solvents at room temperature. The respective values in acetonitrile are @r=O.20 and 0.03, &LO. 18 and 0.02, @J,_~=O. 12 and 0.28. A decrease in the polarity of the solvent results in a strong reduction of @+, for H#.XitA, whereas the other Q values change only slightly. For HsCO-StA @,_,= 0.10 in toluene but is virtually zero in cyclohexane or methylcyclohexane. A singlet mechanism is suggested for trans+cis photoisomerization of the two 9-StA derivatives. Intramolecular charge transfer is indicated for either electron donating or accepting groups (R) of R-StAs.

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