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QUENCHING OF THE FLUORESCENCE OF 8‐METHOXYPSORALEN BY PROTONS
Author(s) -
Menger Eva L.,
Bhattacharjee Himangshu R.,
Hammond George S.
Publication year - 1979
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1979.tb07064.x
Subject(s) - fluorescence , quenching (fluorescence) , aqueous solution , chemistry , excited state , photochemistry , quantum yield , yield (engineering) , diffusion , ground state , analytical chemistry (journal) , atomic physics , materials science , physics , optics , chromatography , thermodynamics , metallurgy
— The quenching of 8‐methoxypsoralen (8‐MOP) fluorescence by protons was observed to occur at the diffusion controlled rates in aqueous solutions at room temperature. Enhanced basicity of 8‐MOP in the excited state compared to the ground state is expected on theoretical grounds. The fluorescence yield. which we determined as 6.3 × 10 ‐ ‐ 4 at pH 1 is surprisingly low and indicative of extremely fast radiationless decay pathways. The fluorescence lifetime of 8‐MOP in neutral aqueous solution is on the order of 1–2 ns.