Electrochemical Explorations of 9,10-Anthraquinone/Hafnium(Ⅳ) Ion Interactions in Nonaqueous Solvents

摘要

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 Hf_2(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 Hf~(4+) interacts more extensively with AQ than does Al~(3+).