• Dr Sanganna V Nishti
• Dr S M Hanagodimath

The fluorescence quenching of 2-[2-(1H-indol-3-yl)-4-oxo-thiazolidin-3-ylamino]-5-oxo-5,6-dihydro-4H-[1,3,4]thiadiazine-6-carboxylic acid ethyl ester by carbon tetrachloride in different solvents viz. benzene, toluene, butanol, methanol and acetonitrile, and time dependent study in toluene solvent has been carried out at room temperature with a view to understand the quenching mechanisms. The experimental results show positive deviation in the Stern-Volmer plot in all the solvents. The quencher con centration dependence data were analyzed using ground state complex formation and sphere of action static quenching models in order to interpret the results. The magnitude of various rate parameters determined suggest that the ground state complex formation model is not applicable in this case but the sphere of action static quenching model agrees well with the experimental results. Hence, both the static and dynamic quenching processes are responsible for the observed positive deviation in the Stern-Volmer plots. Further, it is concluded that these bimolecular quenching reactions are diffusion limited by using the finite sink approximation model, and also the dependence of Stern-Volmer constant on dielectric constant of the solvents suggest the charge transfer character of the excited complex.

Fluorescence, Stern-Volmer plot, Static and dynamic quenching, Charge transfer, Indole.

"Steady State Fluorescence Quenching of Indole Derivative by Carbon Tetrachloride", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.275-280, January-2019, Available :http://www.jetir.org/papers/JETIR1901I35.pdf

"Steady State Fluorescence Quenching of Indole Derivative by Carbon Tetrachloride", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp275-280, January-2019, Available at : http://www.jetir.org/papers/JETIR1901I35.pdf