Nuclear Spin–Lattice Relaxation in Aqueous Alkali-Metal Chloride Solutions

The concentration dependence of the viscosity-adjusted deuteron nuclear spin–lattice relaxation rates of solutions of alkali-metal chlorides in deuterium oxide indicates that viscosity is useful in normalizing the relaxation data. This normalization reveals changes in the relationship between the average molecular rotations and the viscosity, suggesting variations in the dynamic structure of the solutions with various ionic species and concentrations. This viscosity adjustment is not sensitive to the small changes which can be revealed by comparing the concentration dependence of the relaxation rates for the solute nuclei to that for the solvent nuclei. This comparison is shown for the LiCl solutions.