Abstract
Two new organic photochromic compounds containing pyrazolone-ring as photochromic functional unit: 1-phenyl-3-methyl-4-benzoylpyrazol-5-one thiosemicarbazone (1A) and 1-phenyl-3-methyl-4-benzoylpyrazol-5-one S-methylthiosemicarbazone (2A), and some analogous non-photochromic derivatives were synthesized and characterized by elemental analysis, MS, IR Spectra, NMR spectra. The photochromic properties and photocolored kinetics of 1A and 2A were studied by powder-UV reflectance spectra under irradiation of 293 nm light. The crystal structure analysis of photocolored product of 1A showed the photochromic phenomenon was due to the photoisomerization from enol form to keto form. With the addition of the analysis of IR spectra, an intermolecular proton transfer mechanism of the photochemical process was proposed.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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