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Spectroscopic characterizations of semiquinone anion radical formation and autosensitized photooxidation for elsinochrome A
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نویسنده
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lao w. ,li c. ,tai h. ,you j.
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منبع
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journal of the chemical society of pakistan - 2015 - دوره : 37 - شماره : 1 - صفحه:99 -104
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چکیده
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Elsinochrome a (ea) is a natural perylenequinone known for high photosensitization activity. there are a limited number of studies on its photophysical and photosensitive properties. in this study,formation of semiquinone anion radical and ea autosensitized photooxidation reactions were examined. rate constant of semiquinone anion radical formation under anaerobic condition,and rate constant of autosensitized photooxidation reaction under aerobic condition were measured for elsinochrome a (ea) by electron paramagnetic resonance and uv-visible spectra,respectively. the rate constant of formation was estimated at 0.767 min-1 (r2 = 0.963) using the zero-order reaction equation. the autosensitized photooxidation reaction occurred only when irradiation and oxygen co-existed in the ea solution. the average reaction rate constant was 3.22 ±0.36 (×10-9,mol.s-1),and ea half-life was 4.48 ±0.52 (h) in the tetrachloromethane solution. © 2015,chemical society of pakistan. all rights reserved.
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کلیدواژه
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Autosensitized photooxidation; Elsinochrome A; EPR spectra; Semiquinone anion radical
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آدرس
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lanzhou institute of chemical physics,chinese academy of sciences,lanzhou, China, school of chemical science and technology,yunnan university, China, department of pathology,johns hopkins school of medicine,baltimore, United States, school of chemistry and chemical engineering,qufu normal university,qufu, China
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Authors
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