Abstract
A polyelectrolyte salt, which is insoluble in water, was obtained by exchanging the bromide counterions with high molecular weight polymeric anions (poly(p-styrenesulphonic) and polyacrylic) in the polycondensate of 1,4-dibromobutane and 4,4′-dipyridine. Films of this redox active polymer show good oxidation-reduction reversibility, retained even after 2000 cycles. The electrochemical accessibility of the redox centres depends on the thickness of the polymer films and the composition of the solution. In the thin films ( < 1 μm) nearly 100% of the redox centres are active. Atomic force microscopy studies show that these films change their volume during redox cycling due to cations and solvent movement.
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