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- W2079618925 abstract "The binding of Ru(bpy)2+3 onto Nafion membrane (H+ form) is complete in about 20 h and a binding maximum of about 10−5 mol mg−1 has been arrived at from absorption studies. The binding of Ru(bpy)2+3 from a saturated solution of 7-amino-4-methylcoumarin (C120) and Ru(bpy)2+3 also yielded a similar isotherm, but a low binding maximum of Ru(bpy)2+3 was recorded. The binding process studied on Li+- and Cs+-exchanged Nafion forms indicated that while the binding density was enhanced marginally on the Li+ form (compared to the H+ form), there was practically no binding on the Cs+ form. Absorption and luminescence studies on Ru(bpy)2+3 bound to Nafion indicated that the spectra were shifted to blue. In the case of absorption, both the metal-to-ligand charge transfer (MLCT) and π→π* states shifted to the blue, but the luminescence spectra of C120 moved progressively to the red as the binding density increased. Direct interaction between C120 and Ru(bpy)2+3 is observed from luminescence studies as shown by an isoemissive point in the combined luminescence spectra. A static quenching mechanism between C120 and Ru(bpy)2+3 is inferred in the bound state also, as is shown in the case of a homogeneous solution. The Ru(bpy)2+3 emission bound to the Li+ form underwent a blue shift at higher loading." @default.
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- W2079618925 date "1994-09-01" @default.
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- W2079618925 title "Studies on Nafion membrane with 7-amino-4-methylcoumarin (C120) and tris(2,2′-bipyridyl)ruthenium(II) [Ru(bpy)2+3] donor—quencher pair: Binding and emission aspects" @default.
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- W2079618925 doi "https://doi.org/10.1016/0927-7757(94)02866-4" @default.
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