Temperature dependence of activity coefficients and Gibbs energies of transfer of LiBr in acetonitrile, dimethyl sulfoxide, and N,N-dimethylacetamide from EMF measurements

Abstract

Electromotive force (EMF) measurements based on the redox reaction[Formula: see text]are reported for solutions of LiBr at concentrations 0.005 < cLiBr/(mol dm−3) < 0.1 in acetonitrile (AN), dimethyl sulfoxide (DMSO), and N.N-dimethylacetamide (DMA) in the temperature range 278.15 < T/K < 308.15. Gibbs energies of transfer and activity coefficients are estimated. The association constants of LiBr in AN, DMSO, and DMA from EMF measurements and the enthalpy of transfer AN → DMSO are compared to those from other methods of determination. Keywords: temperature-dependent EMF measurements, aprotic solvents, LiBr, TlBr(s) | TlxHg(l) electrode, activity coefficients, transfer quantities.