Excited State Localization and Delocalization of Internal Charge Transfer in Branched Push-Pull Chromophores Studied by Single-Molecule Spectroscopy

摘要

The exciton model is based on the assumption that the interaction between subchromophores is purely electrostatic and can be approximated by dipole-dipole coupling, while all interchro-mophore charge-transfer (CT) processes are neglected. There is no simple way to directly test the validity of this approximation in dendrimers containing branched intramolecular charge transfer (ICT) interactions because of the intrinsic complexity of the ICT chromophores, which are strongly affected by geometrical confinement and charge symmetry.