QUENCHING OF PYRENE FLUORESCENCE BY SINGLE AND MULTIVALENT METAL-IONS IN MICELLAR SOLUTIONS

Abstract

The temporal characteristics of the quenching of pyrene fluorescence in micellar solution, by several metal ions, are shown to depend on the charge and type of metal ion. The quenching by Tl+ and Ag+ is pseudo-first-order and dependent on the micelle concentration. For bivalent metal ions the fluorescence quenching curves show a two-component decay behavior. The biexponential decay behavior is dependent on the micelle concentration, the ionic strength of the solution, and the bivalent ion used. It is shown that some of these effects can be accounted for by assuming that micelle-micelle collisions allow the transfer of a bound metal ion from one micelle to the other. Intramicellar quenching c..