Electrochemical and Spectroscopic Studies of 1,4-Benzoquinone in Ambient Temperature Chloroaluminate Ionic Liquids

摘要

The chemical, electrochemical, and spectroscopic properties of 1,4-benzoquinone (Q) have been studied in the aluminum chloride:1-ethyl-3-methylimidazolium chloride (ImCl) ionic liquid. In basic melts (AlCl3:ImCl mole ratio <1.0), fast scan voltammetry (up to 1000 Vc) shows that Q reduces to Q in a fast two-electron step, probably followed by solvation of the dianion. Infrared and visible spectroscopic data, and electrochemical measurements show that Q reacts with Cl in basic melts producing the dianion of monochlorohydroquinone. Q shows no electrochemical response in acidic melts (1.2:1AlCl3limCl). However, it reacts with the solvent and eventually generates HCl which is electrochemically detected at a Pt electrode. Keywords: Voltammetry, Chloroaluminates, Infra-red spectroscopy, Reprints. (jes)