| Autor: |
Mannekutla, J.R., Mulimani, B.G., Savadatti, M.I., Inamdar, S.R. |
| Předmět: |
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| Zdroj: |
Spectroscopy Letters; Aug2006, Vol. 39 Issue 4, p321-335, 15p, 3 Charts, 4 Graphs |
| Abstrakt: |
Fluorescence quenching of UVITEX‐OB [2,5‐thiophenediylbis(5‐ tert ‐butyl‐1,3‐benzoxazole)] by aniline in different polar and nonpolar solvents was examined at room temperature by steady‐state fluorescence measurements. Positive deviations from the nonlinear Stern–Volmer plots were observed in most of the solvents indicating the extent of quenching to be large. The quencher concentration dependence data were analyzed using ground‐state complex and sphere of action static quenching models in order to interpret the results. The magnitudes of the quenching rate parameters suggest that a sphere of action static quenching model is expected to describe the data most accurately. Also, the results are suggestive of both static and dynamic quenching processes being responsible for the observed positive deviation in the Stern–Volmer plot. Experimental results are described by an equation derived using the finite sink approximation model, which allows the evaluation of diffusion‐limited interaction and the estimation of encounter distance and mutual diffusion coefficient independently. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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