Nuclear magnetic resonance and thermal studies of concentrated aqueous solutions of lithium chloride

The nuclear spin relaxation times, T1 and T2, of 7Li nuclear magnetic resonance have been investigated over a wide range of temperatures in 14 mol kg–1 aqueous lithium chloride solution, whose thermal behaviour was examined with differential thermal analysis. The relaxation is mainly attributed to dipolar coupling between water protons and lithium ions, and T1 and T2 at temperatures higher than the glass transition point are governed by the translational motion of the hydrated lithium ions. The activation parameters of the motion were found to be Ea= 33.5 ± 0.8 kJ mol–1, τ0=(1.2 ± 0.5)× 10–17 s. The Ea values are similar to those for molecular self-diffusion in a plastic-crystalline phase of globular molecules.