Excited state localization and delocalization of internal charge transfer in branched push-pull chromophores studied by single-molecule spectroscopy

Damir Aumiler; Sufan Wang; Xudong Chen; Andong Xia

doi:10.1021/ja901268h

Excited state localization and delocalization of internal charge transfer in branched push-pull chromophores studied by single-molecule spectroscopy

J Am Chem Soc. 2009 Apr 29;131(16):5742-3. doi: 10.1021/ja901268h.

Authors

Damir Aumiler¹, Sufan Wang, Xudong Chen, Andong Xia

Affiliation

¹ The State Key Laboratory of Molecular Reaction Dynamics, and Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.

PMID: 19338299
DOI: 10.1021/ja901268h

Abstract

Single-molecule (SM) spectroscopy has been conducted to study exciton-like intramolecular charge transfer (ICT) coupling dynamics in two model dendritic systems containing branched ICT interactions. The strong coupling and stepwise photobleaching of the ICT branches in the dendrimers, which depend on the torsional disorder, have been demonstrated at the SM level. The fluorescence from the delocalized ICT excited state over two branches in push-pull molecules, which cannot be distinguished by means of conventional experiments probing the average behavior of large ensembles of molecules, has been observed at the SM level.