Description:
Abstract The spin–lattice relaxation rates of the D and 17O nuclei of D2O molecules have been measured for dilute aqueous solutions of potassium halides (KF, KBr, KCl, KI) in the concentration range below 1.0 mol kg−1 at 25°C. The agreement between the B\barx′ coefficients of the spin–lattice relaxation rate (reorientational motion) and the B− coefficients of the solution viscosity of the anions is somewhat better than that of the cations. The reorientational motion of hydration for D2O molecules of Cl−, Br−, and I− ions was anisotropic; this anisotropic motion is enhanced with increasing ion radius. On the other hand, the hydration D2O molecule of the F− ion was approximately isotropic.