Quenching of biacetyl fluorescence and phosphorescence by inorganic anions

Abstract

The quenching of biacetyl fluorescence and phosphorescence by some inorganic anions has been studied in aqueous solution. The fluorescence quenching rate constants are generally higher than the corresponding phosphorescence quenching rate constants. The quenching rate constants are correlated with the oxidation potentials of the anions, indicating that a charge transfer process from the anion to the singlet and the triplet states of biacetyl is responsible for the quenching.