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Issue 7, 1995
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Multiple redox polymers prepared by covalent and electrostatic binding to poly(vinylpyridine-co-styrene): cooperative binding and potential-induced electrostatic binding

Charles M. Lindall,  Joe A. Crayston  and  David J. Cole-Hamilton 

Abstract

Binding of [RuIII(edta)(OH2)]–(edta = ethylenediaminetetraacetate) to pyridine (py) sites in poly(vinylpyridine-co-styrene)(PUPS; 10% styrene) is induced by exposing a PUPS-coated glassy carbon (GC) electrode to dilute solutions of [RuIII(edta)(OH2)]–. This polymer is capable of incorporating [MoIV(CN)8]4–, and the amount of anion incorporated is augmented by holding the electrode in the RuII state in line with expectations due to charge balance. Rotating-disc electrode experiments confirm that the current observed due to the MV2+(MV2+= 1,1′-dimethyl-4,4′-bipyridinium) ion arises from membrane diffusion through the polymer rather than from pinhole effects. Similarly, [RuII(NH3)5(OH2)]2+ was covalently bound to PVPS to give a polymer which can bind [MoIV(CN)8]4– by ion-exchange, the amount depending on the Ru oxidation state. Co-operative binding of both [RuIII(edta)(OH2)]– and [RuII(NH3)5(OH2)]2+ to PVPS results in a single broad wave composed of the two overlapping RuIII/II redox couples present in a 2:1 ratio consistent with their respective charges. The {[RuIII(edta)(OH2)(py)]2[RuII(NH3)5(py)]} polymer can incorporate redox-active ions from either MV2+ or [MoIV(CN)8]4– containing solutions, but at lower levels than observed for the pure [RuIII(edta)(py)]– and [RuII(NH3)5(py)]2+ polymers. The diffusion coefficient for charge transfer, Dct, is higher for the mixed polymer, reflecting its greater concentration of redox sites. The mixed polymer is capable of binding both MV2+ and [MoIV(CN)8]4– species, yielding a redox polymer which can be switched into six different redox states.

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Article type: Paper
DOI: 10.1039/JM9950500955
Citation: J. Mater. Chem., 1995,5, 955-962
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    Multiple redox polymers prepared by covalent and electrostatic binding to poly(vinylpyridine-co-styrene): cooperative binding and potential-induced electrostatic binding

    C. M. Lindall, J. A. Crayston and D. J. Cole-Hamilton, J. Mater. Chem., 1995, 5, 955
    DOI: 10.1039/JM9950500955

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