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

Photophysical and photochemical properties of phenothiazine and N-alkylphenothiazines (alkyl = methyl, ethyl, isobutyl, phenyl, benzyl) in acetonitrile were studied by means of nanosecond laser flash photolysis. Transient absorption measurements showed that the excited triplet state, radical cation,...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1996-01, Vol.93 (1), p.27-31
Main Authors: Guo, Qing-Xiang, Liang, Zhao-Xun, Liu, Bo, Yao, Si-De, Liu, You-Cheng
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Excited triplet state
General and physical chemistry
Laser flash photolysis
Phenothiazine derivatives
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Radical cation
TCNE
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Summary:Photophysical and photochemical properties of phenothiazine and N-alkylphenothiazines (alkyl = methyl, ethyl, isobutyl, 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 radical 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.
ISSN:1010-6030
1873-2666
DOI:10.1016/1010-6030(95)04148-6