Photochromic properties and reaction mechanism of naphthopyran  

作　　者：潘桂兰 魏景强 朱爱平 明阳福 樊美公 姚思德 

出　　处：《Science China Chemistry》2001年第3期276-282,共7页中国科学（化学英文版）

基　　金：Acknowledgements This work was supported by the National Research Fund for Fundamental Key Projects of China (Grant No. G1999033005) and National Natural Science Foundation of China (Grant No. 29832030).

摘　　要：The photochromic properties and reaction mechanism of title compounds have been examined with steady method on compounds 3-phenyl-3-[3-methylbenzothiophene-2-yl]-3H-naphtho[2,1-b]pyran (1) and 3-phenyl-3-[benzofuran-2-yl]-3H-naphtho[2,1-b]pyran (2) and nanosecond laser flash photolysis techniques on compound 3-phenyl-3-[1,2-dimethylindol-3-yl]-3H-naphtho[2,1-b]pyran (3). The influence of oxygen on transient spectra and decay kinetics of compound 3 has been investigated. Both excited singlet state and triplet state are involved in the photochromic mechanism of compound 3. The influence of molecular structure on photochromic behavior has been studied also. Decay kinetics indicated that the lifetime of colored forms of 1 and 2 were several orders of magnitude longer than that of 3.The photochromic properties and reaction mechanism of title compounds have been examined with steady method on compounds 3-phenyl-3-[3-methylbenzothiophene-2-yl]-3H-naphtho[2,1-b]pyran (1) and 3-phenyl-3-[benzofuran-2-yl]-3H-naphtho[2,1-b]pyran (2) and nanosecond laser flash photolysis techniques on compound 3-phenyl-3-[1,2-dimethylindol-3-yl]- 3H-naphtho[2,1-b]pyran (3). The influence of oxygen on transient spectra and decay kinetics of compound3 has been investigated. Both excited singlet state and triplet state are involved in the photochromic mechanism of compound3. The influence of molecular structure on photochromic behavior has been studied also. Decay kinetics indicated that the lifetime of colored forms of1 and2 were several orders of magnitude longer than that of3.

关 键 词：NAPHTHOPYRAN TIME-RESOLVED absorption SPECTRA PHOTOCHROMISM DECAY kinetics. 

分 类 号：O644[理学—物理化学]