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Edge excitation red shift and energy migration in quinine bisulphate dication

Paper ID Volume ID Publish Year Pages File Format Full-Text
28677 44085 2006 8 PDF Available
Title
Edge excitation red shift and energy migration in quinine bisulphate dication
Abstract

Photoinduced excited state dynamical processes in quinine sulphate dication (QSD) have been studied over a wide range of solute concentrations using steady state and nanosecond time-resolved fluorescence spectroscopic techniques. The edge excitation red shift (EERS) of emission maximum, emission wavelength dependence of fluorescence lifetimes and the time dependence of emission maximum are known to occur due to the solvent relaxation process. With increase in solute concentration, the emission spectrum shifts towards the lower frequencies accompanied with decrease in fluorescence intensity, however, absorption spectrum remains unchanged. A decrease in EERS, fluorescence lifetimes, time dependent fluorescence Stokes shift (TDFSS), fluorescence polarization and the solvent relaxation time (τr) is observed with the increase in solute concentration. The process of energy migration among the QSD ions along with solvent relaxation has been found responsible for the above experimental findings.

Keywords
Quinine sulphate dication; EERS; Energy migration
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Edge excitation red shift and energy migration in quinine bisulphate dication
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 177, Issues 2–3, 25 January 2006, Pages 197–204
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
You save - $31
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