Abstract
The photoinduced electron transfer from the excited state of tris(2,2‘-bipyridine)ruthenium(II) (Ru(bpy)32+) incorporated into Nafion membranes to propylviologen sulfonate (PVS°) in the surrounding solution has been examined both by photochemical and photoelectrochemical measurements. N,N‘-Tetramethylene-2,2‘-bipyridinium (DQ2+) entrapped in the Nafion membranes is used as an electron relay. Luminescence quenching studies indicate that the quenching reaction of Ru(bpy)32+ with DQ2+ is both of dynamic and static nature. Ru(bpy)33+ generated from the luminescence quenching remains in the Nafion matrix, while DQ+• migrates to the Nafion−water interface by an electron hopping mechanism, which transfers an electron to PVS° to produce PVS-•. The negatively charged PVS-• is repelled into the bulk solution by the anionic Nafion surface. The isolation of the photoinduced oxidized species Ru(bpy)33+ in Nafion from the ultimate reduced species PVS-• in solution prevents them from undergoing back electron transfer, a...
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