Abstract
The effect of hafnium(IV) trifluoromethanesulfonate [Hf(TfO)4] on the electrochemical behavior of 9,10-anthraquinone (AQ) has been studied in adiponitrile (ADN). AQ undergoes two successive reversible one-electron redox processes in ADN. Addition of Hf(TfO)4 produces a positive reduction peak potential shift due to formation of the complexes Hf(AQ)4+, then Hf2(AQ)8+, as Hf(TfO)4 is added. The reduction of these complexes leads to the appearance of the same oxidation peak, which is assigned to oxidation of Hf(AQ)3 2-. The peak potential shift is greater than that observed for addition of Al(TfO)3, indicating that Hf4+ interacts more extensively with AQ than does Al3+.
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