Temperature Features of Hydration of Singly-Charged Ions as Studied in A Diffusion NMR Experiment


The concentration dependences of the self-diffusion coefficients of water molecules in water solutions of a series of 1–1 electrolytes at different temperatures determined using nuclear magnetic resonance (NMR) with a magnetic field gradient are analyzed. The relevant results show that the hydration sign for Cs+, I, Rb+, Br, K+, and Cl ions changes at temperatures characteristic for each ion. These characteristic temperatures are determined for the ions and KI, KBr, KCl, CsF, LiI, KF, LiCl, NaCl, RbCl, and Li2SO4 water solutions. The temperature dependence of the \(\tau _{0} /\tau _{{1i}}\) ratio of the lifetime of water molecules in the structure of bulk water \(\tau_{0}\) to their lifetime in the structure of hydrated shells \(\tau_{1i}\) of Cs+, I, Rb+, Br, Cl, K+, Na+, F, and Li+ ions (i) is studied.

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Sevryugin, V.A., Zagainov, V.M. Temperature Features of Hydration of Singly-Charged Ions as Studied in A Diffusion NMR Experiment. Appl Magn Reson (2020). https://doi.org/10.1007/s00723-020-01204-2

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