Structure of the Nearest Environment of Ions in Aqueous Solutions of Praseodymium Chloride in a Wide Range of Concentrations
P. R. Smirnov, O. V. Grechin
Российский журнал физической химии А
https://doi.org/10.1134/S003602442110023X
The radial distribution functions of aqueous solutions of praseodymium chloride in a wide range of concentrations under standard conditions were calculated from the experimental data obtained earlier by XRD analysis. The results were analyzed using a model approach. The quantitative characteristics of the nearest environment of Pr3+ and Cl– ions were determined: coordination numbers, interparticle distances, and types of ion pairs. At higher concentration, the average number of water molecules decreases from 9 to 6.2 in the first coordination sphere of the cation and from 14.4 to 4.2 in the second. It was concluded that the structure of a dilute solution is determined by an ion pair of the noncontact type, which transforms into an ion triplet at increased concentrations.
- Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 153045, Ivanovo, RussiaP. R. Smirnov
- Ivanovo State University of Chemistry and Technology, 153000, Ivanovo, RussiaO. V. Grechin
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