The effect of cucurbit[7]uril (CB7) on photo induced transformations of cationic dye 3,3′-diethylthiacarbocyanine iodide (Dye + ) in water in the presence of 9-anthracene carb oxylic acid as photosensitizer was studied by nanosecond laser photolysis. Sensitized photoexcitation of Dye + leads to population of the triplet level of the dye. The photoisomerization proceeds via the formation of an intermediate “perpendicular” form of the dye molecule characterized by two absorption bands, as follows from the results of quantum chemical calculations. The presence of CB7 in the dye solution leads to an increase in the lifetime of triplet molecules and in the yield of the diradical cation as a result of dimerization of the dye molecules.

中文翻译：

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9-蒽羧酸作为敏化剂时3,3'-二乙基硫杂碳菁在水中的光致转化：葫芦[7]脲的影响

通过纳秒激光光解研究了葫芦[7]脲（CB7）对水中阳离子染料3,3'-二乙基硫碳菁碘化物（Dye + ）在9-蒽羧酸作为光敏剂存在下光致转化的影响。染料 + 的敏化光激发导致染料三线态水平的聚集。光异构化通过形成以两个吸收带为特征的中间“垂直”形式的染料分子而进行，如下来自量子化学计算的结果。由于染料分子的二聚化，染料溶液中CB7的存在导致三线态分子的寿命和双自由基阳离子产率的增加。