title: Comparison of the conductivity properties of the tetrabutylammonium salt of tetrakis(pentafluorophenyl)borate anion with those of traditional supporting electrolyte anions in nonaqueous solvents.
abstract: Cyclic voltammetry experiments at minielectrodes exhibit less ohmic error for lower polarity solvents when the supporting electrolyte anion is [B(C(6)F(5))(4)](-) rather than one of the smaller traditional anions such as [BF(4)](-), [PF(6)](-), or [ClO(4)](-). Conductance measurements have been performed for [NBu(4)][B(C(6)F(5))(4)] in tetrahydrofuran, dichloromethane, benzotrifluoride, and acetonitrile and compared with results for [NBu(4)](+) salts of several traditional anions in the same solvents. In solvents with dielectric constants of 10 or less, ion association constants, K(A), are as much as 2 orders of magnitude lower with [B(C(6)F(5))(4)](-), TFAB, as the electrolyte anion and the degree of this lowering is related to the acceptor property of the solvent. Analyses carried out on the basis of a Fuoss model attribute this fact to differences in concentrations of contact ion pairs rather than of solvent-separated ion pairs. The greater dissociation of the TFAB ion is attributed to its highly delocalized charge.
authors.affiliation: Department of Chemistry, The University of Vermont, Burlington, Vermont 05405, USA.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: LeSuer
authors.forename: Catherine
authors.initials: C
authors.lastname: Buttolph
authors.forename: William E
authors.initials: WE
authors.lastname: Geiger