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# Temperature-dependent time-resolved fluorescence study of cinchonine alkaloid dication

Hirdyesh, Mishra and Sanjay, Pant and Tripathi, Hera B (2008) Temperature-dependent time-resolved fluorescence study of cinchonine alkaloid dication. In: Journal of Fluorescence, 18 (1). pp. 17-27.

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## Abstract

Photo induced excited state dynamical processes of cinchonine alkaloid dication $(C^+^+)$ have been studied over a wide range of temperature using steady state and nanosecond time-resolved fluorescence spectroscopic techniques. The temperature-dependent fluorescence studies of $C^+^+$ clearly indicate the existence of two distinct emitting species having their own characteristic decay rates. The shorter-lived species shows a usual temperature dependence with increasing non-radiative deactivation at higher temperatures, while the longer-lived species show features resembling to the excited state solvent relaxation process with a large solvent relaxation time $(\tau_r \sim 6 ns)$. The species emitting in the lower energy side, having longer decay time is found to be more sensitive towards chloride ion quenching and has a charge transfer character. Further, concentration quenching with decrease in $\tau_r$ of long lived species shows the possibility of energy migration along with solvent relaxation in $C^+^+$.

Item Type: Journal Article This article copyright belongs to Springer Netherlands Cinchonine; Solvent relaxation; Fluorescence quenching Division of Biological Sciences > Molecular Biophysics Unit 25 Feb 2008 19 Sep 2010 04:42 http://eprints.iisc.ernet.in/id/eprint/13084

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