Electrochemistry of Tantalum(V) Chloride in the Basic Aluminum Chloride‐1‐Methyl‐3‐Ethylimidazolium Chloride Room‐Temperature Molten Salt

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Abstract
Electronic absorption spectroscopy indicated that tantalum(V) is complexed as in the basic molten salt. This anionic species can be reduced to in a one‐electron, reversible electrode reaction with a voltammetric half‐wave potential of −0.49V in the 44.4/55.6 m/o melt vs. the Al3+/Al couple in the melt at 40°C. Voltammograms of solutions also exhibit a second reduction process with a voltammetric peak potential of about −1.70V vs. this same reference electrode. This second electrode reaction is complicated by coupled homogeneous chemistry at slow scan rates but appears to simplify to a one‐electron reduction process at fast scan rates. The average Stokes‐Einstein products for and are , respectively. The former complex, but not the latter, appears to react slowly with oxide in the melt to form an oxide‐containing complex. The conditional equilibrium constant for the reaction between oxide and is approximately . The tantalum(V) oxide‐containing species can be converted back to its chloride complex with .

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