Abstract
Multiply charged electroactive anions [IrCl 2−6 , Fe(CN) 3−6 , and W(CN) 4−8 ] are electrostatically incorporated in polymeric films of tris(4-vinyl-4′-methyl-2,2′-bipyridine) ruthenium(II) [poly-Ru(vbpy) 2+3 ] from aqueous trifluoroacetate solution. Values of apparent diffusion coefficients (D ct) and heterogenous electron transfer rates (k et) are measured for these anions as a function of their relative concentration (Γ M/Γ Ru) in the film.D ct andk et decrease systematically asΓ M/Γ Ru increases in a manner that is independent of charge and chemical identity of the ion. This result suggests that a nonchemical process, presumably electrostatic cross-linking, limits diffusional motion and is responsible for the decrease inD ct andk et with increasing anion content. Protonated polyvinyl-pyridine films exhibit similar ranges and variations inD ct andk et, which suggest similar structures and mechanisms of charge transport for these films and poly-Ru(vbpy) 2+3 .
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Kasem, K.K., Schultz, F.A. Ion exchange and charge transport properties of polymeric tris(4-vinyl-4′-methyl-2,2′-bipyridine) ruthenium(II) films. J Inorg Organomet Polym 4, 377–390 (1994). https://doi.org/10.1007/BF00683702
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DOI: https://doi.org/10.1007/BF00683702