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Photochromic properties and reaction mechanism of naphthopyran 总被引:1,自引:0,他引:1
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. 相似文献
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对化合物(1)3-苯基-3-[3-甲基苯并噻吩-2-基]-3H-萘并[2,1-b]吡喃,化合物(2)3-苯基-3-[苯并呋喃-2-基]-3H-萘并[2,1-b]吡喃和化合物(3)3-苯基-3-[1,2-二甲基吲哚-3-基]-3H-萘并[2,1-b]吡喃分别用稳态方法和激光光解技术研究了它们的光致变色性质和反应机理.氧对化合物3的瞬态吸收光谱和衰减动力学的影响表明3的开环过程以激发单重态为主,但也有激发三重态的参与.研究了分子结构对光致变色行为的影响.衰减动力学研究表明,化合物1和化合物2的呈色体的寿命比化合物3大几个数量级. 相似文献
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