Conformations of the triplet state of aromatic olefins. Observation of the transoid triplet states of 3,3-dimethyl-1-(2-naphthyl)-1-butene and 3,4-dihydrophenanthrene as a rigid planar triplet model |
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| Authors: | Tatsuo Arai Hirochika Sakuragi Katsumi Tokumaru Yoshio Sakaguchi Junko Nakamura Hisaharu Hayashi |
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| Affiliation: | Department of Chemistry, University of Tsukuba, Sakura-mura, Ibaraki 305 Japan;Institute of Physical and Chemical Research, Wako, Saitama 351 Japan |
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| Abstract: | The observed triplet—triplet absorption of 3,3-dimethyl-1-(2-naphthyl)-1-butene is assigned to the planar transoid geometry (3t*) from its spectral similarity to the 3,4-dihydrophenanthrene triplet, a rigid planar model, as well as from the measured rate constants for its quenching by azulene and oxygen. The results are in contrast the 1,2-diarylethylene triplets which favor the perpendicularly twisted geometry (3p*). |
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