The structure of a concentrated solution of MgCl2 in methanol has been studied by X-ray diffraction. The parameters for the ion-solvent interactions are in good agreement with those found in aqueous solutions. Both for Mg2+ and Cl- the solvate shells are composed of 6 methanol molecules. An average octahedral arrangement of OH groups in the solvate shells of magnesium is probable. Octahedral symmetrical positions for CH3 groups proved to be unlikely
Continuing our investigations on the solvation of chlorides of selected main group elements in concentrated solutions of electrolytes this paper is intended to discuss the possibility of the qualitative interpretation of the solubility data by the example of regions of the 25°C solubility isotherm of 11 systems of the type MgCl2 H2O — Organic solvent. As to magnesium chloride a significant influence on the solubility can be noticed in a general analogy to aluminium(III)‐chloride according to the solvent groups of the Kolthoff classification. The results obtained correlate with the results of spectroscopic investigations.
Special significance is attached to solid phases so far unknown in literature.
Starting from pure DMSO (DMSO‐d6) the solvent‐solvent interactions detectable in the aqueous systems were investigated by means of vSO and vCS.
On the basis of the results obtained the solvation behaviour of cations (Li+, Mg2+, Al3+) in DMSO (DMSO‐d6)H2O mixtures is discussed. In spite of the prevailing solvent‐solvent interactions direct cation‐DMSO (DMSO‐d6) interactions can still be proved in solutions rich in water, which suggest preferred cation solvation by the organic molecule.
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