Single-ion transfer enthalpies for Ph 4P + = BPh −4 Na + and I − ions in methanol- N, N-dimethylformamide mixtures

Abstract

Enthalpies of solution of Ph 4PI and NaBPh 4 in rnethanol- N,N-dimethylformamide (DMF) mixtures have been measured within the whole range of the mixed solvent composition. The ionic contribution to the transfer enthalpy from methanol to methanol-DMF mixtures based on the assumption that Δ H t XXX(BPh − 4) = Δ H t xxx(Ph 4P +), has been calculated using the data obtained and earlier data for NaI solution. The single-ion transfer enthalpies change monotonically with the mixture's composition, without any extrema typical of the systems containing water as a component of the mixed solvent.