The fluorescence quenching of coumarin dye namely 4-(2,6-dibromo-4-methyl-phenoxymethyl)-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.
International Letters of Chemistry, Physics and Astronomy (Volume 65)
A. H. Sidarai et al., "Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture", International Letters of Chemistry, Physics and Astronomy, Vol. 65, pp. 32-36, 2016