Photoprocesses in spiropyran-derived merocyanines: Singlet versus triplet pathway

被引:54
|
作者
Gorner, H [1 ]
Atabekyan, LS [1 ]
Chibisov, AK [1 ]
机构
[1] RUSSIAN ACAD SCI,NN SEMENOV CHEM PHYS INST,MOSCOW 117334,RUSSIA
关键词
D O I
10.1016/0009-2614(96)00878-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The properties of two indoline spirobenzopyrans, one (1) containing a 6-nitro and an 8-methoxy group in the benzopyran portion and the other no nitro group (2), were studied by nanosecond laser photolysis in solution at room temperature. A transient, which is ascribed to a cis photoisomer, was observed on excitation of either the spiropyran or the trans isomer of compound 1 (lambda(exc) = 353 and 530 nm, respectively). The activation parameters for thermal cis --> trans isomerization were measured, and the ground state properties of the spiropyran - trans-merocyanine couple are described, The quantum yields of the spiropyran --> merocyanine photocoloration and trans --> cis photoisomerization were obtained in solvents of different polarity. A short-lived transient (less than or equal to 10 mu s) of compound 1 is identified as a triplet state of the trans isomer. The effects of excitation wavelength on the photophysical and photochemical properties of both compounds are discussed and a new mechanism is suggested.
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页码:59 / 64
页数:6
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