Cyclic voltammetry experiments at minielectrodes exhibit less ohmic error for lower polarity solvents when the supporting electrolyte anion is [B(C6F5)(4)](-) rather than one of the smaller traditional anions such as [BF4](-), [PF6](-), or [ClO4](-) Conductance measurements have been performed for [NBu4][B(C6F5)(4)] in tetrahydrofuran, dichloromethane, benzotrifluoride, and acetonitrile and compared with results for [NBu4](+) 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(C6F5)(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.
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