Journal of Physical Chemistry p. 6060 - 6065 (1993)
Update date:2022-08-11
Topics:
Hable, Christopher T.
Crooks, Richard M.
Valentine, James R.
Giasson, Richard
Wrighton, Mark S.
Charge associated with quinone reduction is trapped at low pH in systems composed of sulfonated anthraquinones electrostatically bound to a polymer derived from a monomer consisting of a quinone unit flanked by two viologen units.Each monomer repeat unit carriers 6 equiv of positive charge which can be charge compensated by monosulfonated anthraquinone to yield a quinone:viologen ratio of nearly 7:2.At low pH, electrostatic binding is persistent, and the amount of trapped charge is 90percent of the theoretical maximum.Some of the electrostatically bound quinone can be replaced with Fe(CN)6(3-) to allow mediated release of trapped charge via the Fe(CN)6(3-/4-) redox couple.I(-) is blocked from entering the polymer and thus does not mediate release of charge.Electrostatic binding of anionic quinones to a thiophene polymer with pendant viologen units has also demonstrated.This polymer system has the unique property of having built-in mediators for both the reduction (charge trapping) and oxidation (charge release) of the electrostatically bound anthraquinone.
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