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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，ｌ－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．
(1) 3-phenyl-3- [3-methylbenzothiophen-2-yl] -3H-naphtho [2,1- - [benzofuran-2-yl] -3H-naphtho [2,1-b] pyran and compound (3) 3-phenyl-3- [1,2-dimethylindol- ] -3H-naphtho [2,1-b] pyran, their photochromic properties and their reaction mechanism were studied by steady-state methods and laser photolysis. The effect of oxygen on the transient absorption spectra and the decay kinetics of compound 3 shows that the ring-opening process of 3 is dominated by the excited singlet state but also with the excited triplet state. The influence of molecular structure on photochromic behavior was studied. Attenuation kinetics studies show that the colorimeters of compound 1 and compound 2 have several orders of magnitude longer lifetime than compound 3.