Abstract
The complexation of 9-fluorenone by aluminum(III) trifluoromethanesulfonate [Al(TfO)3] in adiponitrile / 1.0 M tetraethylammonium tetrafluoroborate has been studied by electrochemical methods. Addition of Al(TfO)3 to solutions of 9-fluorenone cause the first 9-fluorenone one-electron reduction process to broaden, signaling an increase to a two-electron process. The interaction of the aluminum cation with the 9-fluorenone radical anion is evidently responsible for this behavior. In addition, the appearance of an entirely different reduction process at a potential positive of the initial reduction process indicates that the 9-fluorenone : aluminum complex is also formed. 9-Fluorenone : aluminum cation interactions in the similar 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate (BMPY TfO) ionic liquid system are considerably less than in the ADN / 1.0 M TEA BF4 system, presumably due to the very high concentration of triflate in the ionic liquid system.
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