Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Fluorescence Quenching of Bis-msb by Carbon Tetrachloride in Different Solvents

  • Thipperudrappa, J. (Department of Physics, Gulbarga University) ;
  • Biradar, D.S. (Department of Physics, Gulbarga University) ;
  • Lagare, M.T. (Department of Physics, Gulbarga University) ;
  • Hanagodimath, S.M. (Department of Physics, Gulbarga University) ;
  • Inamdar, S.R. (Department of Physics, Karnatak University) ;
  • Kadadevaramath, J.S. (Department of Physics, Karnatak University)
  • Published : 2004.04.01
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Abstract

Fluorescence quenching of l,4-bis [2-(2-methylphenyl) ethenyl]-benzene (Bis-MSB) by carbon tetrachloride in five different solvents namely hexane, cyclohexane, toluene, benzene and dioxane has been carried out at room temperature with a view to understand the quenching mechanisms. The Stern-Volmer plot has been found to be non-linear with a positive deviation for all the solvents studied. In order to interpret these results we have invoked the Ground state complex and Sphere of action static quenching models. Using these models various rate parameters have been determined. The magnitudes of these parameters imply that sphere of action static quenching model agrees well with the experimental results. Hence the positive deviation in the Stem-Volmer plots is attributed to the static and dynamic quenching. Further, with the use of Finite Sink approximation model, it was possible to check whether 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 diffusion coefficient D determined using the Edwardis empirical relation and Stokes-Einstein relation.

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References

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