A Study of Excitation Delocalization/Localization in Multibranched Chromophores by Using Fluorescence Excitation Anisotropy Spectroscopy. Issue 3 (17th December 2015)

• Record Type: Journal Article
• Authors: Li, Yang; He, Guiying; Wang, Xian; Guo, Qianjin; Niu, Yingli; Xia, Andong
• Is Part Of: Chemphyschem. Volume 17:Issue 3(2016)
• Page Start: 406
• Page End: 411
• Publication Date: 2015-12-17
• Subjects: ab initio calculations -- chromophores -- delocalization -- energy transfer -- fluorescence; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201501001
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: We describe a simple approach to study the excitation localization/delocalization in multibranched chromophores by using fluorescence excitation anisotropy spectroscopy at room temperature. As examples, the electronic excitations in three different multibranched chromophores (dimers) are investigated. For a weakly coupled dimer, fluorescence anisotropy is independent of excitation wavelength, due to localized excitation as well as the degenerate electronic excited states. In contrast, in the case of a strongly coupled dimer, owing to excitonic splitting, a redistribution of the excitation energy is demonstrated by the dependence of anisotropy spectra on the excitation wavelength, which leads to significant deviation from the anisotropy signal of localized excitation. In particular, based on the law of additivity for anisotropy, the degree of delocalized excitation can be simply estimated for a given dimer. Abstract : Let's get excited ! A simple approach to investigate the excitation localization/delocalization in multibranched chromophores by using fluorescence excitation anisotropy spectroscopy at room temperature is described.