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Laser Induced Photochromic Mechanism of 3-Phenyl-3-[1,2-Dimethylindol-3-Yl]-3H-Naphtho[2,1-B]Pyran

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The photochromic process of 3-phenyl-3-[1,2-dimethylindol-3-yl]-3H-naphtho[2,1-b]pyran [I] has been examined with nanosecond laser flash photolysis techniques in cyclohexane and acetonitrile respectively. Both excited singlet state and triplet state are involved in the photocoloration process. The decay kinetics of photoproducts are also studied. The maximum absorption wavelength and lifetime of the transient species are solvent dependent.

Affiliations: 1: Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing, 100101, CHINA; 2: Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, The Chinese Academy of Sciences, Shanghai, 201800, CHINA


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