Photoprocesses of bis(15-crown-5)-1,4-distyrylbenzene (DSB) and its complexes with barium and lead perchlorates in MeCN were studied by absorption, luminescence, and laser kinetic spectroscopies. Triplet DSB complexes are involved in the degradation of electronic excitation energy along with the trans—cis-isomerization and fluorescence processes. The most effective intersystem crossing was observed for the complex with lead perchlorate. The process is accompanied by a decrease in the quantum yield of DSB fluorescence and no trans—cis-isomerization is observed in this case. Shifts of spectral bands observed in the absorption and fluorescence spectra and the changes in the band intensities as well as the ability of DSB to form the 2: 2 bisandwich complex with barium perchlorate were explained using the results of quantum chemical calculations.

中文翻译：

---

双(15-crown-5)-1,4-二苯乙烯基苯及其与金属高氯酸盐的配合物：光子学和结构

通过吸收、发光和激光动力学光谱研究了双 (15-crown-5)-1,4-二苯乙烯基苯 (DSB) 及其与高氯酸钡和铅的配合物在 MeCN 中的光加工过程。三重 DSB 复合物参与电子激发能量的降解以及反式-顺式异构化和荧光过程。对于含有高氯酸铅的复合物，观察到最有效的系统间交叉。该过程伴随着 DSB 荧光量子产率的降低，并且在这种情况下未观察到反式-顺式异构化。使用量子化学计算的结果解释了在吸收和荧光光谱中观察到的光谱带的移动和带强度的变化以及DSB与高氯酸钡形成2:2双夹心络合物的能力。