Study on the mechanism of fluorescence quenching of nitrocompounds for oxazoles

摘要

The mechanism of nitrocompounds quenching of the fluorescence of 5'-dipheny 1-2, 2'- bisoxazole (POOP) and trans-1, 2-bis [2-(5-phenyloxazolyl)] ethene (POEOP) has been studied. It was found that the fluorescence of oxazoles was quenched mainly by the absorption competition and radiationless energy transfer of nitrocompounds. The fluorescence quenching rate constants of nitrobenzene and nitromethane are 3.0 × 10~10 L·s~-1 and 1.5 × 10~8 L·mol~-1·s~-1 respectively for POEOP. This remarkable difference was explicated.