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Study of Fluorescence Quenching on Novel Coumarin Derivatives by Aniline in Different Solvents
Authors:Ashok H Sidarai  Vani R Desai  Shirajahammad M Hunagund  Mahantesha Basanagouda  Jagadish S Kadadevarmath
Institution:1.Department of Studies in Physics,Karnatak University,Dharwad,India;2.P. G. Department of Studies in Chemistry,K. L. E. Society’s P. C. Jabin Science College,Hubli,India
Abstract:The steady-state fluorescence quenching of novel coumarin derivatives; 4-(2, 6-dibromo-4-methyl-phenoxymethyl)-benzoh]chromen-2-one DMB] and 6-methoxy-4-p-tolyoxymethyl-chromen-2-one TMC] has been studied in toluene, benzene, dioxane, acetonitrile and tetrahydrofuran THF] using aniline as a quencher at room temperature with a view to understanding the role of diffusion in the quenching mechanism. The probability of quenching per encounter (p) is calculated in all the solvents. Further, an activation energy for quenching (E a) was estimated using the values of p and the literature values of activation energy for diffusion (E d). The magnitudes of these parameters indicate that the fluorescence quenching of these molecules by aniline is not solely due to the material diffusion but there is also a contribution of an activation energy.
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