Photoredox reactions in water-in-oil microemulsions. The functions of amphiphilic viologens in charge separation and electron transfer across a water-oil boundary.

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Photosensitized redn. of a series of dialkyl-4,4'-bipyridinium salts, CnV2+, with Cn alkyl of n = 1, 4, 6, 8, 14, and 18 was examd. in water-in-oil microemulsions, by using Ru(bpy)32+ (bpy = 2,2'-bipyridine) [15158-62-0] as sensitizer and (NH4)3 EDTA [15934-01-7] as electron donor. With the amphiphilic electron acceptors (n = 8-18) the water-in-oil microemulsion media effect the charge sepn. of the initial encounter cage complex, and stabilize the photoproducts, CnV+ and Ru(bpy)33+, against the recombination process. Consequently, enhanced quantum yields for CnV+. formation are obsd. under continuous illumination. [on SciFinder(R)]


CAPLUS AN 1984:513865(Journal)