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

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