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Article
Intramolecular Charge Transfer Promoted Fluorescence Energy Transfer: A Demonstration of Re-Absorption of the Donor Fluorescence by the Acceptor
Journal of Molecular Liquids (2010)
  • Debanjana Ghosh, Jadavpur University
  • Deboleena Sarkar, Jadavpur University
  • Nitin Chattopadhyay, Jadavpur University
Abstract
Intramolecular charge transfer (ICT) promoted fluorescence transfer has been investigated in two polar solvents, acetonitrile and water. The ICT species of 4-N,N-dimethylaminobenzonitrile (DMABN) produced exclusively in the photoexcited state serves as the donor while phenosafranin (PSF), a cationic phenazinium dye, acts as the acceptor. A transfer of the fluorescence occurs from the ICT state of DMABN to PSF in both the media. Time-resolved fluorescence decay analysis in combination with the steady state fluorometric observations conclusively rule out the involvement of the fluorescence resonance energy transfer (FRET) process and establish the fluorescence transfer as a consequence of re-absorption of the fluorescence of the donor by the acceptor. Thus, apart from citing an example of a coupled interaction of ICT and fluorescence transfer, importance of the present work lies in providing a demonstration in differentiating between the Förster resonance energy transfer and the trivial energy transfer through re-absorption.
Keywords
  • Intramolecular charge transfer,
  • FRET,
  • Re-absorption,
  • 4-NN-dimethylaminobenzonitrile
Disciplines
Publication Date
June 30, 2010
DOI
10.1016/j.molliq.2010.06.006
Citation Information
Debanjana Ghosh, Deboleena Sarkar and Nitin Chattopadhyay. "Intramolecular Charge Transfer Promoted Fluorescence Energy Transfer: A Demonstration of Re-Absorption of the Donor Fluorescence by the Acceptor" Journal of Molecular Liquids Vol. 156 Iss. 2-3 (2010) p. 131 - 136
Available at: http://works.bepress.com/debanjana-ghosh/11/