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A study on the laser flash photolysis of phenothiazine and its N-alkyl derivatives

✍ Scribed by Qing-Xiang Guo; Zhao-Xun Liang; Bo Liu; Si-De Yao; You-Cheng Liu

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 654 KB
Volume: 93
Category: Article
ISSN: 1010-6030
DOI: 10.1016/1010-6030(95)04148-6

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✦ Synopsis

Photophysical and photochemical properties of phenolhiazine and Noalkylphenothiazines (alkyl ~ methyl, ethyl, isobutyi, phenyl, benzyl) in acetonitrile were studied by means of nanosecond laser flash photolysis. Transient absorption measurements showed that the excited triplet state, radical cation, neutral radical, dimeric radical cation and dimeric dication were formed during the photolysis. The kinetics of the formation and conversion of the transient species was investigated. The deprotonation of the phenothiazine ra:lical cation (PTH" + ) to give the neutral radical PT" was prevented by the presence of tetracyanoethylene (TCNE). The mechanism of the interaction of phenothiazines and TCNE is discussed.

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