Fluorescence quenching of anthracene by aniline in five
different solvents has been carried out at room temperature with a view to
understand the quenching mechanisms. Experimental results show positive
deviation in the Stern-Volmer plots in all the solvents studied. In order to
interpret these results the ground state complex and sphere of action static
quenching models have been invoked. Using these models various rate parameters
have been determined. Ground state complex formation model is found not to be
applicable. Using sphere of action static quenching model 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 S-V plots is attributed to the
static and dynamic quenching. Further, with the use of finite sink approximation model it has been observed that these
bimolecular reactions are diffusion limited. The dependence of Stern-Volmer
constant on dielectric constant of the solvents suggests the charge transfer
character of the excited complex.
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