Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture

Abstract

Keywords: Fluorescence quenching, sphere of action static quenching model, finite sink approximation model. Abstract.The fluorescence quenching of coumarin dye namely 4-(2, 6-dibromo-4-methylphenoxymethyl)-benzo[h]chromen-2-one [DMB] has been studied by aniline, in a different solvent mixture of benzene (BN) and acetonitrile (AN) at room temperature. The quenching is found to be appreciable and shows positive deviation from linearity in the Stern-Volmer (S-V) plots for all the solvent mixtures. The various rate parameters responsible for fluorescence quenching have been determined using a sphere of action static quenching model and finite sink approximation model. The magnitudes of these rate parameters indicate that positive deviation in the S-V plot is due to both static and dynamic quenching processes.