Ion Ion Solvent Interactions in Solution .X. Group-2 Perchlorates in Water

Abstract

Solutions of Mg(ClO₄)₂, Ca(ClO₄)₂ and Sr (ClO₄)₂ have been studied at a variety of concentrations up to saturation by means of infrared absorption, Raman scattering and multinuclear n.m.r. spectroscopy. For solutions of Mg(ClO₄)₂ there was little ion association up to saturation but for the other two salts association to both solvent shared anion- cation complexes and contact anion-cation complexes was identified. The nature of the association process was probed by using line broadening for the quadrupolar nuclei ¹⁷O, ³⁵Cl and ⁴³Ca . The extent of association to solvent shared anion-cation complexes was found to increase in the series Mg²⁺ < Ca²⁺ < Sr²⁺.