The dissolution of vanadium(V) oxide (V 2 O 5 ) in various ionic liquids has been studied to determine the complexes formed with respect to melt composition and V 2 O 5 concentration. Vanadium oxide did not dissolve in either 1- n -butyl-3-methylimidazolium tetrafluoroborate or 1- n -butyl-3-methylimidazolium trifluoromethanesulfonate ionic liquids. V 2 O 5 was found to dissolve at temperatures greater than 70 °C in 1-ethyl- and 1- n -butyl-3-methylimidazolium tetrachloroaluminate ionic liquids. Analyses of vanadium-containing melts by 51 V, 1 H, and 13 C NMR and infrared spectroscopy indicate the emergence of different species as a function of melt acidity. In basic and neutral melts, VO 2 Cl 2 - and a metavanadate species of the form [(VO 3 ) n ] n - are observed. The species VO 2 Cl 2 - is the prominent product in basic melts, but as the melt becomes neutral or as the concentration of V 2 O 5 is increased, the concentration of the metavanadate species is found to increase. However, V 2 O 5 has been found to react in acidic melts to form volatile VOCl 3 .
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Bell et al. (1999) studied this question.
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