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LONG‐RANGE TRIPLET‐SINGLET ENERGY TRANSFER FROM ENZYME GENERATED TRIPLET ACETONE TO XANTHENE DYES
Author(s) -
Durán Nelson,
Cilento Giuseppe
Publication year - 1980
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.1751-1097.1980.tb03997.x
Subject(s) - xanthene , intersystem crossing , triplet state , singlet state , photochemistry , chemistry , rose bengal , acetone , energy transfer , excited state , atomic physics , molecule , physics , organic chemistry , chemical physics
— Enzyme‐generated and protected acetone transfers its energy to xanthene dyes by a nontrivial process. The relative populations of the S 1 state are indicative of the operation of a heavy atom effect, being 1:15:100 for fluorescein, eosine and Rose Bengal. On the other hand Stern‐Volmer constants and k ET 0 values are similar for the three dyes and are remarkably higher than for collisional processes. It is tentatively suggested that at least for eosine and Rose Bengal, a triplet‐triplet cxciton transfer may occur to populate an upper triplet state of the dye followed by heavy‐atom enhanced intersystem crossing to the S 1 state.