树枝形聚合物修饰的双8-羟基喹啉光物理研究

Dendritic Bis-(8-hydroxyquinoline) Derivatives: Studies on the Fluorescence Quenching and Decay

研究了树枝形聚合物修饰的双8-羟基喹啉衍生物(Gn-QMQ,n=1￣3)在二氯甲烷和乙腈中的荧光猝灭过程和荧光衰减过程.随着代数n的增加,猝灭速率常数减小,核心双8-羟基喹啉基团荧光寿命增长,非辐射失活速率常数减小.研究结果表明,随着代数的增加,树枝形骨架对核心基团的位点分离作用增大,在乙腈中树枝形骨架趋于紧密构象,具有更强的位点分离作用.

The fluorescence quenching and the fluorescence decay of a series of dendritic bis-（8-hydroxyquinoline） derivatives （Gn-QMQ, n=1-3） were studied. The quenching rate constant decreased and fluorescence lifetime increased with the generation n increase, which resulted from an increased site-isolating effect of the dendritic structure on the core. Photophysical studies in different solvents indicated that there was an enhanced site-isolating effect in CH3CN.