title: Solid-state photochromic properties and mechanism of 1-phenyl-3-methyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-methylthiosemicarbazone.
abstract: 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.
authors.affiliation: Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, China.
authors.forename: Jixi
authors.initials: J
authors.lastname: Guo
authors.forename: Lang
authors.initials: L
authors.lastname: Liu
authors.forename: Dianzeng
authors.initials: D
authors.lastname: Jia
authors.forename: Junhua
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Xie
mesh_terms: D000042:Absorption; D003116:Color; D018360:Crystallography, X-Ray; D006358:Hot Temperature; D006860:Hydrogen Bonding; D006878:Hydroxides / Q000737:chemistry; D007536:Isomerism; D008027:Light; D011522:Protons; D011720:Pyrazoles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D013882:Thiosemicarbazones / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: C540200:1-phenyl-3-methyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-methylthiosemicarbazone; D006878:Hydroxides; D011522:Protons; D011720:Pyrazoles; D013882:Thiosemicarbazones; C031280:pyrazole; C031356:hydroxide ion