Solid-State Photochromic Properties and Mechanism of 1-Phenyl-3-methyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-Methylthiosemicarbazone

4-Acylhydroxypyrazoles combined with thiosemicarbazide derivants exhibit excellent photochromism in the crystalline state. Upon irradiation with 365 nm light, colorless enol-form isomers are converted to the yellow keto-form isomers. FT-IR, UV/vis, and fluorescence spectra were used to investigate t...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2009-02, Vol.113 (7), p.1255-1258
Main Authors: Guo, Jixi, Liu, Lang, Jia, Dianzeng, Wang, Junhua, Xie, Xiaolin
Format: Article
Language:English
Subjects:
A: Kinetics, Spectroscopy
Absorption
Color
Crystallography, X-Ray
Hot Temperature
Hydrogen Bonding
Hydroxides - chemistry
Isomerism
Light
Protons
Pyrazoles - chemistry
Spectrometry, Fluorescence
Spectroscopy, Fourier Transform Infrared
Thiosemicarbazones - chemistry
Ultraviolet Rays
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Summary:4-Acylhydroxypyrazoles combined with thiosemicarbazide derivants exhibit excellent photochromism in the crystalline state. Upon irradiation with 365 nm light, colorless enol-form isomers are converted to the yellow keto-form isomers. FT-IR, UV/vis, and fluorescence spectra were used to investigate the photochromic behavior of 1-phenyl-3-methyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-methylthiosemicarbazone. A possible photochromic mechanism has been proposed based on the analysis of the crystal structure of the sample.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp808378e