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

Qing Xiang Guo; Zhao Xun Liang; Bo Liu; Si De Yao; You Cheng Liu

doi:10.1016/1010-6030(95)04148-6

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

Qing Xiang Guo^*, Zhao Xun Liang, Bo Liu, Si De Yao, You Cheng Liu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	27-31
Number of pages	5
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	93
Issue number	1
DOIs	https://doi.org/10.1016/1010-6030(95)04148-6
Publication status	Published - Jan 4 1996
Externally published	Yes

ASJC Scopus Subject Areas

General Chemistry
General Chemical Engineering
General Physics and Astronomy

Keywords

Excited triplet state
Laser flash photolysis
Phenothiazine derivatives
Radical cation
TCNE

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10.1016/1010-6030(95)04148-6

Cite this

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title = "A study on the laser flash photolysis of phenothiazine and its N-alkyl derivatives",

abstract = "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.",

keywords = "Excited triplet state, Laser flash photolysis, Phenothiazine derivatives, Radical cation, TCNE",

author = "Guo, {Qing Xiang} and Liang, {Zhao Xun} and Bo Liu and Yao, {Si De} and Liu, {You Cheng}",

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T1 - A study on the laser flash photolysis of phenothiazine and its N-alkyl derivatives

AU - Guo, Qing Xiang

AU - Liang, Zhao Xun

AU - Liu, Bo

AU - Yao, Si De

AU - Liu, You Cheng

PY - 1996/1/4

Y1 - 1996/1/4

N2 - 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.

AB - 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.

KW - Excited triplet state

KW - Laser flash photolysis

KW - Phenothiazine derivatives

KW - Radical cation

KW - TCNE

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JF - Journal of Photochemistry and Photobiology A: Chemistry

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

Abstract

ASJC Scopus Subject Areas

Keywords

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