1H and Multinuclear Solid NMR Study to Reveal the Ion Exchange Mechanism of Alkali Metal Ions-Ion Exchange Selectivity and Hydration Property in the Solid Phase-:—Ion Exchange Selectivity and Hydration Property in the Solid Phase—

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Solid NMR technique was applied to elucidate the ion exchange reactions, especially those that relate to the hydration reaction in the solid phase. First, solid NMR was applied to observe the hydration reaction of alkali metal ions intercalated in the layered transition metal disulfides, such as TaS2 and NbS2, and NMR spectra of monolayer and bilayer form water molecules were examined. Then the characteristic ion exchange property of titanium and tin antimonic acids was examined by multinuclear solid NMR and the presence of two exchange sites for the Li+ ion was elucidated. The 3rd and the 4th examples were concerned with H+/Li+ ion exchange reaction of monoclinic HSbO3 and cubic HNbO3 where the accommodation of the Li+ ion occurred in the completely dehydration state. The ion exchange process was clearly elucidated due to the simultaneous observation of 1H and 7Li NMR spectra. As the integration of solid NMR study, 7Li/6Li isotope separation reaction was examined based on the dehydration reaction of inorganic ion exchangers. It was found from the study that 7Li/6Li isotope separation coefficient increased with increasing dehydration degree on occasion of the accommodation of lithium ions where the hydration property in the solid phase was definitely clarified by solid NMR spectra.
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