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Effect of Solvent Polarity on the Fluorescence Quenching of Biologically Active 5BAMC by Aniline in Binary Solvent Mixtures

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Abstract

The fluorescence quenching of 5, 6-benzo-4-azidomethyl coumarin (5BAMC) by aniline have been carried in different solvent mixtures of benzene (BN) and acetonitrile (AN) at room temperature by steady state fluorescence measurements. The quenching is found to be appreciable and a positive deviation from linearity was observed in the Stern-Volmer plot for the fluorophore in all the solvent mixtures. Various parameters for the quenching process have been determined using the extended S-V equation and have been found to be dependent on the solvent polarity. Further, with the use of finite sink approximation model, it is concluded that the bimolecular reactions quenching reactions are diffusion limited, and the distance parameter R′ and mutual diffusion coefficient D are estimated independently.

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Acknowledgements

The author Dr Raveendra M Melavanki is grateful to Dr. K. Rajanikanth, Principal, Dr. K. Venkatesh, H O D of Physics and the management of M.S.R.I.T, Bangalore-560054 for their encouragement and providing necessary facilities.

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Authors and Affiliations

  1. Department of Physics, M S Ramaiah Institute of Technology, Bangalore, 560054, Karnataka, India

    Raveendra M. Melavanki

  2. Department of Chemistry, Karnatak University, Dharwad, 580003, Karnataka, India

    Raviraj A. Kusanur & Manohar V. Kulkarni

  3. Department of Physics, Karnatak University, Dharwad, 580003, Karnataka, India

    Jagadish S. Kadadevaramath

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  1. Raveendra M. Melavanki
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  2. Raviraj A. Kusanur
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  3. Jagadish S. Kadadevaramath
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  4. Manohar V. Kulkarni
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Correspondence to Raveendra M. Melavanki.

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Melavanki, R.M., Kusanur, R.A., Kadadevaramath, J.S. et al. Effect of Solvent Polarity on the Fluorescence Quenching of Biologically Active 5BAMC by Aniline in Binary Solvent Mixtures. J Fluoresc 20, 1175–1180 (2010). https://doi.org/10.1007/s10895-010-0664-7

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  • DOI: https://doi.org/10.1007/s10895-010-0664-7

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