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EFFECTS OF EXCITED‐STATE PROTON TRANSFER ON THE PHOSPHORESCENCE OF TYROSINE‐PHOSPHATE COMPLEXES
Author(s) -
Schnarr Manfred,
Helene Claude
Publication year - 1982
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.1751-1097.1982.tb04345.x
Subject(s) - phosphorescence , intersystem crossing , chemistry , excited state , photochemistry , proton , fluorescence , triplet state , tyrosine , phosphate , molecule , atomic physics , organic chemistry , singlet state , biochemistry , physics , quantum mechanics
Phosphate anions quench the fluorescence of tyrosine at room temperature as a result of an excited‐state proton transfer. At 77 K in frozen solutions the fluorescence of tyrosine is still quenched by phosphate anions but the phosphorescence emission is enhanced. No tyrosinate phosphorescence is detected. A mechanism is proposed to explain these results: excited‐state proton transfer from tyrosine to phosphates is followed by intersystem crossing in tyrosinate anions with subsequent back‐transfer of the proton in the triplet state.