Add time:07/21/2019         Source:sciencedirect.com

Conductivities were measured at 298.15 K for LiClO4, LiAsF6, Bu4NCl, Bu4NClO4, Bu4NBPh4 and Ph4AsCl in 2-(chloromethyl)tetrahydrofuran, and for LiAsF6 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 LiClO4 and LiAsF6 exist predominately as contact ion pairs as opposed to LiBPh4 and NaBPh4 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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