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Nikos G. Tsierkezos

Conductivity Studies of n-Tetrabutylammonium Tetraphenylborate in Acetone and Acetonitrile in the Temperature Range from 283.15 to 303.15K

Keywords: association constant, Lee–Wheaton Model, Limiting Ion Conductivity, Tetrabutylammonium Tetraphenylborate, Thermodynamic Quantities

The molar conductivities (Λ) of solutions of n-tetrabutylammonium tetraphenylborate (NBu₄BPh₄) in acetone (ACE) and acetonitrile (ACN) have been measured at eight different temperatures in the range from 283.15 to 303.15K. The Λ values have been analysed using the Lee–Wheaton conductivity equation in the Pethybridge-Taba modification and the limiting molar conductivities (Λ_o) and the association equilibrium constants (K_A) have been derived. The centre-to-centre distances (α) of the formed ion pairs have been considered to be equal to the Bjerrum´s distance. The limiting ion conductivities (λ^o_±) have been evaluated according to the method of Krumgalz and the experimental λ^o_± values have been compared with the theoretical λ^o₊ values calculated from the empirical equation of Gill. The thermodynamic functions, Gibbs energy (ΔG^o_A), enthalpy (ΔH^o_A), and entropy (ΔS^o_A) for the ion-pair formation process as well as the activation energy of the ionic movement (ΔH^∗) have been evaluated.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 222, 01/2008
Pages: 63 - 79

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