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合成了一系列的N-10位取代的吩噻嗪给体受体化合物,这些受体包括苯、苯甲醚、吡啶、萘、苯乙酮和苯乙腈.研究了不同极性溶剂中这些化合物的分子内的光诱导电荷转移现象.稳态荧光的溶剂化效应和较大的Stokes位移清楚表明,仅仅后四种吩噻嗪衍生物的激发态存在着分子内的电荷转移,而苯和苯甲醚取代吩噻嗪因为受体部分氧化电势低,所以不具有这种特性.修正过的Lippert-Mataga公式被用来分析Stokes位移值,从而获得激发态偶极矩.较大的激发态偶极矩说明在激发态时这四种给体受体化合物体系内发生了完全的电子转移.氧化还原电势的数据表明基态时这四种衍生物给体受体部分的作用比较弱.分析荧光光谱获得的结果说明伴随着电荷转移这四种衍生物的激发态构型变化比较小,给体和受体间的扭转角在电荷转移后的激发态与在基态时相似.
A series of N-10 substituted phenothiazine donor acceptor compounds were synthesized, including benzene, anisole, pyridine, naphthalene, acetophenone and phenylacetonitrile. The effects of these compounds in different polar solvents , The solvation of the steady-state fluorescence and the larger Stokes shift clearly show that there is only intramolecular charge transfer in the excited states of the last four phenothiazine derivatives, whereas benzene and benzene Methyl ether replaces phenothiazine because of its low partial oxidation potential, so this modified Lippert-Mataga equation is used to analyze Stokes shift to obtain excited-state dipole moment. The polar moments indicate complete electron transfer within the four donor acceptor compound systems in the excited state.The data for the redox potential indicate that the four derivative donor acceptor sites act less strongly at the ground state.Fluorescence spectroscopy The obtained results show that the configurations of the excited states of the four derivatives with charge transfer are relatively small, and the torsion angle between the donor and the acceptor is similar to that at the ground state after the charge transfer.