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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 MoS 2 , A x (H 2 O) y -MoS 2 (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 x (H 2 O) y MoS 2 , 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 H 2 O molecules are activated at room temperature.

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