Solid-state NMR study of hydrated intercalation compounds of molybdenum disulfide

Solid-state NMR has been used to study the local coordination environments of the protons and alkali metal cations in hydrated alkali metal intercalation compounds of MoS2, A(x)(H2O)(y)-MoS2 (A = Li,Na, K, Cs). The dynamic behavior of the water molecules, which are coordinated to the intercalated A(+) cations, is consistent with an ordered quasi two-dimensional translational motion at room temperature. In Li,(H2O)(y)MoS2, the hydrated Li+ cations occupy two distinct sites in the van der Waals gap that are connected by dynamic processes. Partially random motions of the H2O molecules are activated at room temperature.