J. Schoebrechts
1987
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Abstract
The chemistry of tungsten hexachloride in an acidic sodium chloroaluminate (63 mole % A IC I 3 ) has been investigated by electrochem ical and spectroscopic techniques at temperatures of 150 and 175°C. Tungsten hexachloride undergoes several reduction steps in the melt, the f ir s t of which is sensitive to the presence of oxide containing im purities. U V -visible absorption measurements indicate that tungsten hexachloride reacts with oxides in the melt to form the oxide tetrachloride VJOCI 4 . Comparison between spectroscopic re su lts and electrochem ical data indicates that the fir s t voltammetric wave is due to the reduction of WClg. The in it ia l amount of oxide in the melt as w ell as the equilibrium constant for formation of WOCI 4 can be obtained from a p lot of reduction current of WClg vs. the formal concentration of W (VI).