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合成了以-(CH_2)_4连接的荧光素、紫精、咔唑二元及三元化合物,运用吸收光谱,荧光光谱及荧光寿命研究了荧光素-咔唑、紫精-荧光素、紫精-荧光素-咔唑等二元、三元化合物分子内的光致相互作用,结果表明:分子内紫精对荧光素荧光的淬灭主要通过形成不发荧光的络合物,荧光淬灭的效率φ_Q为0.97,荧光寿命淬灭的效率φ_(ET)为0,不发荧光络合物的淬灭的效率φ_C为0.97.咔唑对荧光素荧光的淬灭则以动态的光致电子转移过程为主,荧光淬灭的效率φ_Q为0.63,荧光寿命淬灭的效率φ_(ET)也为0.63,不发荧光络合物的淬灭效率φ_C为0.在三元化合物内紫精-荧光素和荧光素-咔唑对光致相互作用是一种竞争过程,以荧光素-咔唑对间的动态电子转移反应为主,φ_Q为0.97,φ_(ET)为0.65,不发荧光络合物的淬灭效率φ_C为0.32.从反应自由能变化的角度对此进行了讨论.
The binary and ternary compounds of fluorescein, viologen and carbazole linked with - (CH_2) _4 were synthesized. Fluorescein - carbazole, viologen - fluorescein and viologen were studied by absorption, fluorescence and fluorescence lifetime. - fluorescein - carbazole and other binary, ternary compounds intramolecular photodegradation, the results show that: the intramolecular purple fluorescence quenching of fluorescein mainly through the formation of non-fluorescent complexes, fluorescence quenching The efficiency of φ_Q is 0.97, the quenching efficiency of fluorescence lifetime φ_ (ET) is 0, and the quenching efficiency φ_C of non-fluorescent complex is 0.97. The quenching of fluorescein fluorescence by carbazole can be described by dynamic photoelectron transfer , The efficiency of fluorescence quenching φ_Q is 0.63, the quenching efficiency of fluorescence lifetime φ_ (ET) is also 0.63, and the quenching efficiency φ_C of non-fluorescent complex is 0. In the ternary compound, viologen-fluorescence The photodynamic interaction between fluorescein and fluorescein-carbazole is a competitive process. Fluorescein-carbazole pairs are mainly responsible for the dynamic electron transfer reaction with φ_Q of 0.97 and φ_ (ET) of 0.65. Fluorescein- The quenching efficiency of the material φ_C is 0.32. This is discussed from the point of view of the change of free energy of reaction.