Study of aqueous solutions of lithium iodates by Li7 nuclei relaxation

Spin-lattice relaxation time of Li7nuclei, T1 has been measured in aqueous solutions of lithium iodate by the spin echo method. The solutions in H2O and D2O have been studied with addition of iodic acid, as well as potassium, rubidium, or cesium iodates. The time T1 for Li7nuclei in D2O is about twice that in H2O. This is related to the fact that when protons are replaced with deuterons in the first hydrate shell, the rate of magnetic relaxation of Lisup(7-1/Tsub(1M)) 1 The analysis of concentration dependence T1 has shown that, up to 3 mol/l of LiIO3 in H2, the IO3- ion does not replace the water molecule in the first hydrate shell of Li+. Addition of potassium iodate into the solution of LiIO3 reduces T1 of Li7 whereas addition of RbIO3 and CsIO3 practically does not affect the time T1. This is due to the formation in aqueous solution of associates containing IO3-, Li+, and K+. The dependences of spin-lattice relaxation times (Tsub(1M)) of Li7 in the solutions of lithium iodate in light and heavy water Tsub(1M) on salt concentration are presented