Abstract
The electrochemical reduction of 9,10-anthraquinone (AQ) has been found to occur in two reversible one-electron processes in the adiponitrile (ADN)/0.20 M TEA BF4 solvent system. Upon addition of aluminum(III) trifluoromethanesulfonate to the solution, the initial reduction process is shifted to a more positive potential due to complexation of the carbonyl oxygen by Al3+. As AQ is reduced, the Al3+ is also able to react with the AQ reduction products. Even at the 0.40 Al3+:1.00 AQ point, the initial reversible processes are entirely absent, implying that Al3+ is able to interact with, or complex, approximately three 9,10-anthraquinone dianion reduction products. This high degree of interaction is also reflected in the large 1.0 V separation between the potentials for reduction of the AQ(AlCl3) complex and the oxidation of the complexed AQ dianions.
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