Quenching of acetone fluorescence by inorganic anions

Abstract

Simple inorganic anions were found to be effective quenchers of acetone fluorescence in aqueous solution. A linear correlation for the quenching rate constant with the ionization potential of the anion, measured by the energy of the charge-transfer-to-solvent (C.T.T.S.) absorption band maximum, has been observed. Although no fluorescence from an excited-state charge-transfer complex was detected, an electron-transfer quenching mechanism was clearly implicated. Energy transfer complications were suggested for the nitrite and nitrate ions.