PHOTOINDUCED DIMOL LUMINESCENCE OF SINGLET MOLECULAR-OXYGEN IN SOLUTIONS OF PHOTOSENSITIZERS

被引:49
作者
KRASNOVSKY, AA
NEVEROV, KV
机构
[1] Department of Biology, M.V. Lomonosov Moscow State University
关键词
D O I
10.1016/0009-2614(90)85475-R
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
A delayed luminescence caused by photosensitized formation of dimols of singlet molecular oxygen has been observed in aerobic solutions of different photosensitizers in CCl4, hexafluorobenzene and freon 113. Its intensity is proportional to the square of the intensity of excitation and its lifetime is equal to half of the singlet-oxygen lifetime. Removal of oxygen or addition of singlet-oxygen quenchers leads to a strong decrease of this luminescence. At equal intensities of the singlet-oxygen generation, the intensity of this delayed light emission varies by 8 orders of magnitude for solutions of different photosensitizers. If the principal maximum of the photosensitizer fluorescence is at λ≥703 nm, the emission spectrum coincides with the fluorescence spectrum of the photosensitizer. If the maximum of the photosensitizer fluorescence is at λ≥680 nm, the emission band at 703 nm is dominant and, in some cases, additional bands at 635 nm and at λ≥730 nm were observed. The data suggest that the 635 and 703 nm emission bands belong to the singlet-oxygen dimols activated in collisions with molecules of the photosensitizers and products of their oxygenation. Other bands belong to molecules of the photosensitizers and products of their photodestruction excited as a result of energy migration from singlet-oxygen dimols. © 1990.
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页码:591 / 596
页数:6
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