Solvent effect on the fluorescence quenching of biologically active carboxamide by aniline and carbon tetrachloride in different solvents using S-V plots

Patil, NR and Melavanki, RM and Kapatkar, SB and Chandrasekhar, K and Ayachit, NH and Umapathy, Siva (2012) Solvent effect on the fluorescence quenching of biologically active carboxamide by aniline and carbon tetrachloride in different solvents using S-V plots. In: JOURNAL OF LUMINESCENCE, 132 (3). pp. 558-565.

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Abstract

The fluorescence quenching studies of carboxamide namely (E)-N-(3-Chlorophenyl)-2-(3,4,5-trimethoxybenzylideneamino)-4,5,6,7 tetrahydrobenzob]thiophene-3-carboxamide ENCTTTC] by aniline and carbon tetrachloride in six different solvents namely toluene, cyclohexane, n-hexane, n-heptane, n-decane and n-pentane have been carried out at room temperature with a view to understand the quenching mechanisms. The Stern-Volmer (S-V) plots have been found to be nonlinear with a positive deviation for all the solvents studied. In order to interpret these results we have invoked the ground state complex formation and sphere of action static quenching models. Using these models various quenching rate parameters have been determined. The magnitudes of these parameters suggest that sphere of action static quenching model agrees well with the experimental results. Hence the positive deviation is attributed to the static and dynamic quenching. Further, with the use of Finite Sink approximation model, it was possible to check these bimolecular reactions as diffusion-limited and to estimate independently distance parameter R' and mutual diffusion coefficient D. Finally an effort has been made to correlate the values of R' and D with the values of the encounter distance R and the mutual coefficient D determined using the Edward's empirical relation and Stokes Einstein relation. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF LUMINESCENCE
Publisher:	Elsevier
Additional Information:	Copyright for this article belongs to Elsevier
Keywords:	Fluorescence quenching; ENCTTTC; Diffusion limited; Static and dynamic quenching and Finite sink approximation model
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	07 Aug 2012 05:17
Last Modified:	07 Aug 2012 05:17
URI:	http://eprints.iisc.ac.in/id/eprint/44519

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