Photoluminescence and quenching of 4,4'‐dicarboxy‐2,2'‐bipyridinebis(2,2'‐bipyridine)‐ruthenium(II) complex (Ru(DCbpy)(bpy)22+) 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.
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Kaneko et al. (1992) studied this question.
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