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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3723

Title: Anomalous excited-state dynamics of Lucifer yellow CH in solvents of high polarity: Evidence for an intramolecular proton transfer
Authors: PANDA, D
MISHRA, PP
KHATUA, S
KONER, AL
SUNOJ, RB
DATTA, A
Keywords: h-atom-transfer
charge-transfer
photophysical properties
fluorescence spectra
antitumor-activity
perylene quinones
electron-transfer
dye
hypocrellin
mixtures
Issue Date: 2006
Publisher: AMER CHEMICAL SOC
Citation: JOURNAL OF PHYSICAL CHEMISTRY A, 110(17), 5585-5591
Abstract: The photophysics of the fluorescent probe Lucifer yellow CH has been investigated using fluorescence spectroscopic and computational techniques. The nonradiative rate is found to pass through a minimum in solvents of intermediate empirical polarity. This apparently anomalous behavior is rationalized by considering the possibility of predominance of different kinds of nonradiative processes, viz. intersystem crossing (ISC) and excited-state proton transfer (ESPT), in solvents of low and high empirical polarity, respectively. The feasibility of the proton transfer is examined by the structure determined by the density functional theory (DFT) calculations. The predicted energy levels based on the time-dependent density functional theory (TD-DFT) method in the gas phase identifies the energy gap between the S-1 and nearest triplet state to be close enough to facilitate ISC. Photophysical investigation in solvent mixtures and in deuterated solvents clearly indicates the predominance of the solvent-mediated intramolecular proton transfer in the excited state of the fluorophore in protic solvents.
URI: http://dx.doi.org/10.1021/jp056295q
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3723
http://hdl.handle.net/10054/3723
ISSN: 1089-5639
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