Abstract: | The thermodynamic data (ΔG0, ΔH0 and TΔS0) of the solvation of tetraphenylarsonium-tetraphenylborate (Ph4AsPh4B) and its neutral parts, tetraphenylgermanium (Ph4Ge) and tetraphenylmethane (Ph4C) in methanol—N,N-dimethylformamide mixed solvents are discussed. The values of the free energy of transfer, ΔsMG0, are calculated from measurements of the solubilities of Ph4AsPh4B, Ph4Ge and Ph4C in the successive fractions of MeOH in DMF at three different temperatures (15, 25, 35°C). The values of ΔsMH0 and TΔsMS0 for the derivatives are calculated from ΔsMG0 values. The values of ΔsMG0, ΔsMH0 and TΔsMS0 of tetraphenylarsonium and tetraphenylborate ions have also been carefully calculated. The ratios of ΔsMG0 values (ΔsMG0 = ΔG0(+)/ΔG0(?)) were found to be greater than unity. Similarly, the ratios of ΔsMH0 and TΔsMS0 for the positive and negative ions were found to be greater than unity. |