Abstract
Conductivities were measured at 298.15 K for LiClO 4, LiAsF 6, Bu 4NCl, Bu 4NClO 4, Bu 4NBPh 4 and Ph 4AsCl in 2-(chloromethyl)tetrahydrofuran, and for LiAsF 6 in tetrahydrofuran. Comparing these results with literature data for THF and 2-methyltetrahydrofuran systems, it is found that the nature of the anion plays an important role in determining type of ion pair formed. In all the ethers considered, it is found that LiClO 4 and LiAsF 6 exist predominately as contact ion pairs as opposed to LiBPh 4 and NaBPh 4 which form solvent-separated ion pairs. This effect, and the abnormally large ion association constants, K ∞ a , found for tetraalkylammonium salts are satisfactorily treated in terms of non-coulombic contributions to the energy of interaction of the ion pair.
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