Influence of structural and rotational isomerism on the triplet blinking of individual dendrimer molecules

Abstract

Collective on/off behavior and different spectral behavior has been identified for individual molecules of different isomers (see for example the fluorescence spectra for two isomers as a function of time) with three perylenedicarboximide chromophores. In 8 % of the dendrimer molecules, the chromophores interact to form an excimer-like structure which possess a higher rate of intersystem crossing than the rest of the molecules. This is the first time that this phenomenon has been proven experimentally at the single-molecule level.