Abstract
Recent solution chemistry of inorganic species in anhydrous hydrogen fluoride is reviewed, covering investigations involving dme polarography and solid electrode voltammetry, measurement of conductance and colligative properties and spectroscopy, both electronic and esr. Using the data from these studies it is postulated that speciation of solutes, particularly cationic entities, is simpler in hydrogen fluoride than in water. This is interpreted in terms of the small number of potential ligands derived from anhydrous hydrogen fluoride, namely the hydrogen fluoride molecule itself and the fluoride ion; on the other hand, species in aqueous solution can be aquo-, hydroxo- and oxo-complexes, the latter frequently being very complex polymeric species. Also few, if any, anions exist in anhydrous hydrogen fluoride which are not related to the solvent, so that complexation by extraneous species does not occur to the extent that it does in water.
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