Edge excitation red shift and energy migration in quinine bisulphate dication |
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| Institution: | 1. Department of Chemical Engineering, University of Hyogo, Shosha 2167, Himeji, 671-2280, Japan;2. Department of Chemical Engineering, Curtin University Malaysia, CDT 250 Miri, Sarawak, 98009, Malaysia;1. Institute for Global Food Security, Queens University Belfast, David Keir Building, Malone Road, Belfast, BT9 5BN, Northern Ireland, UK;2. Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UU, Scotland, UK;3. Department of Soil Science, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh;4. Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UK;5. Department of Soil Science, Soikoine University of Agriculture, P. O. Box 3008, Morogoro, Tanzania;6. Department of Plant Production, University of Sirte, Libya;7. University of the Highlands and Islands, 12b Ness Walk, Inverness, Scotland, IV3 5SQ, UK;8. European Commission, Ispra, Italy;9. Faculty of Health and Life Sciences, De Montfort Univ., The Gateway, Leicester LE1 9BH, UK;1. Dept. of Physics, University of Genoa & INFN, Via Dodecaneso 33, 16146, Genova, Italy;2. Laboratoire Interuniversitaire des Systèmes Atmosphériques 61, Av. du Générale de Gaulle, 94010 Créteil, France |
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| 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. |
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