Solute–solvent interactions in water + t-butyl alcohol mixtures. Part 12.—Single-ion enthalpies of transfer using the tetraphenylarsonium tetraphenylborate assumption

Abstract

Heats of solution of tetraphenylarsonium chloride (ϕ₄AsCl) and sodium tetraphenylboride (NaBϕ₄) in water and water + t-butyl alcohol mixtures (from 0 to 40% by weight) have been measured. From these data and the previous values for NaCl, enthalpies of transfer of tetraphenylarsonium tetraphenylboride are estimated. Using the classical assumption of equivalent change of solvation with solvent media of the two tetra-aryl ions, ionic enthalpies of transfer are estimated for various cations and anions. This reveals a completely distinct behaviour for the two types of ions. These results are discussed in terms of the structure of the water + t-butyl alcohol mixtures.