摘要
In this paper, the photophysical and photosensitive properties of Elsinochrome A (EA), another member of perylenequinone photosensitizers derived via artificially biological synthesis, were stud- ied by taking hypocrellin A (HA) and hypocrellin B (HB) as the references. It was found that the quantum yield of singlet oxygen produced via the photosensi- tization of EA was 0.98 with HB (0.84) as a reference. Furthermore, the semiquinone anion could be pro- duced via photosensitization of EA in oxygen-free solution. Besides, taking advantage of nanosecond time-resolved spectral technique, the transient triplet absorption spectra and the lifetime of EA in cyclo- hexane were determined by the use of the ground- state depletion method.
In this paper, the photophysical and photosensitive properties of Elsinochrome A （EA）, another member of perylenequinone photosensitizers derived via artificially biological synthesis, were studied by taking hypocrellin A （HA） and hypocrellin B （HB） as the references. It was found that the quantum yield of singlet oxygen produced via the photosensitization of EA was 0.98 with HB （0.84） as a reference. Furthermore, the semiquinone anion could be produced via photosensitization of EA in oxygen-free solution. Besides, taking advantage of nanosecond time-resolved spectral technique, the transient triplet absorption spectra and the lifetime of EA in cyclohexane were determined by the use of the groundstate depletion method.
基金
This research was supported by the National Natural Science Foundation of China （Grant No. 20262007 ）
the Natural Science Foundation of Yunnan Province （Grant No. 2000C0106M）.
关键词
荧光光谱
感光性能
单态氧
吸收光谱
半醌自由基负离子
光敏剂
Elsinochrome A
fluoresces spectra
absorption spectra
singlet oxygen
semiquinone radical anion
triplet-state.
