Composition of the first coordination sphere of Ni2+ in concentrated aqueous NiCl2 and NiBr2 solutions. Part 2.—Application of halide nuclear magnetic relaxation

Abstract

³⁵ Cl, ³⁷Cl, ⁸¹Br and ⁷⁹Br longitudinal and transverse magnetic relaxation rates in aqueous NiX₂(X = Cl, Br) solutions in the concentration range 0 ⩽c⩽ 2.5 mol kg^–1 are reported. They are given at various temperatures and at various frequencies. Chemical shift data of the ³⁵Cl magnetic resonance as a function of the temperature are also reported. Finally, MgX₂ and CaX₂ solutions were also measured to serve as a standard for diamagnetic electrolyte solutions.

Applying the Swift–Connick exchange analysis the occurrence probabilities and life times of the halide ions in the first coordination sphere of Ni²⁺ are determined. Mechanisms of a partly three-site nature are discussed and the mode of application is analysed.