Substitution reactions of beryllium(II) ion in mixed solvents IV. Beryllium sulphate complexes in water‐hexamethylphosphoric triamide mixtures

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Abstract
Using conductivity and pressure jump relaxation measurements the complex formation of BeSO4 has been studied in mixtures of water and hexamethylphosphoric triamide (HMPT). The rate of substitution of a solvent molecule in the inner solvation sheath of the beryllium ion by a sulphate ion depends on the composition of the solvate species Be(HMPT)i(H2O)4‐i and on the type of solvent molecule being replaced by the sulphate ion. Above a mole fraction xHMPT ≥ 0.2 six relaxation processes have been observed. From the conductivity and the kinetic measurements the existence of a Be(SO4)22− complex was inferred in the mixed solvents. Measurements of the densities, dielectric constants and viscosities of the solvent mixtures are reported.