Electronic excitation energy quenching of indole derivative by CCl4 in different solvents

Abstract

The electronic excitation energy quenching of 2-phenyl-3-(3?-hydroxythiazolidin-4?-ione-2?-yl) benz(g) indole by carbon tetrachloride (CCl4) in different solvents viz., n-butanol, dioxane, benzene, methanol, DMF and acetonitrile has been carried out at room temperature to understand nature of quenching mechanism. The Stem-Volmer plots have been found to be linear. The value of probability of quenching per encounter p is found to be less than unity in all the solvents, and the activation energy for quenching 'Ea' is greater than the activation energy of diffusion 'Ed'. Hence, it is inferred that the fluorescence quenching mechanism is not solely controlled by the material diffusion. © 2007 IACS.