Abstract
2-Styrylazulene ( 2) and 1,2-di(azulenyl)ethene ( 3) undergo one-way cis → trans isomerization on direct irradiation and on triplet sensitization. The quantum yield of cis → trans isomerization ( φ c → t) on triplet sensitization increases with the initial cis isomer concentration and exceeds unity ( φ c → t = 25 at [cis- 2] = 17. × 10 −3 M ). The quantum yield of cis → trans 2 and 3 are in the region of 10 −3 on direct irradiation at the higher excited singlet state S 2, but increase with increasing concentration of the cis isomer. These results strongly indicate that, even on direct irradiation of 2-azulenylethenes, one-way cis → trans isomerization takes place as a quantum chain process in the excited triplet state after intersystem crossing.
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