Coordination of Ions in Aqueous Manganese Chloride Solutions: X-ray Diffraction Data
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The radial distribution functions of aqueous manganese chloride solutions are calculated from experimental X-ray diffraction data in a wide range of concentrations under standard conditions. Different models of the structural organization of the systems are developed. The optimum variants are revealed by calculating theoretical functions for each model and comparing their correspondence to experimental functions. Quantitative parameters of the immediate environment of Mn2+ and Cl– ions (coordination numbers, interparticle distance, and types of ion pairs) are found. It is shown that contact ion pairs determine the structure of a saturated solution. It is found that dilution results in contact ion pairs becoming non-contact and the independent hydration of the ions.