Abstract
Fluorescence (FL) quenching of 3-aminoquinoline (3AQ) by halide ions has been explored in an aqueous acidic medium using the steady-state and time-domain FL measurement techniques. The halide ions showed no significant change in the absorption spectra of 3AQ in an aqueous acidic medium. The FL intensity was strongly quenched by ions and the order of FL quenching by halide ions was . The decrease in FL lifetime along with the reduction in FL intensity of 3AQ suggested the dynamic nature of quenching. The obtained values were 328 for ions and 119 for ions and the values were ~ and , respectively. The observations suggested that the likely governing mechanism for FL quenching may be an electron transfer process and the involvement of the heavy atom effects.
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