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QUENCHING OF PHOTOEXCITED 4,4'‐DICARBOXY‐2,2'‐BIPYRIDINEBIS(2,2'‐BIPYRIDINE)RUTHENIUM(II) BY OXYGEN IN AQUEOUS SOLUTION AND IN SILK FIBROIN MEMBRANE
Author(s) -
Kaneko M.,
Iwahata S.,
Asakura T.
Publication year - 1992
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.1751-1097.1992.tb04270.x
Subject(s) - fibroin , aqueous solution , quenching (fluorescence) , ruthenium , membrane , chemistry , oxygen , polymer chemistry , silk , photochemistry , chemical engineering , materials science , organic chemistry , fluorescence , catalysis , composite material , biochemistry , physics , quantum mechanics , engineering
— Photoluminescence and quenching of 4,4'‐dicarboxy‐2,2'‐bipyridinebis(2,2'‐bipyridine)‐ruthenium(II) complex (Ru(DCbpy)(bpy) 2 2 + ) in an aqueous solution as well as in a silk fibroin membrane were studied. Emission quenching by oxygen in an aqueous solution showed a linear relationship with respect to oxygen concentration. When the complex was incorporated into a silk fibroin membrane by adsorption from an aqueous solution into a preformed membrane, the photoexcited state of the complex was not quenched by oxygen in an aqueous phase. However, when the complex was incorporated into a silk fibroin membrane by casting a mixture of the complex and silk fibroin, the photoexcited complex was quenched by oxygen in an aqueous phase. In this case the Stern‐Volmer plots showed a downward‐deviating curve indicating heterogeneity of the probe site. Emission intensity decreased with an increase of the water content in the silk fibroin membrane.