HOST LATTICE ELECTRONIC-PROPERTIES OF HYDRATED LAYERED INTERCALATION COMPOUNDS STUDIED BY SOLID-STATE H-1-NMR

Solid state H-1 NMR methods have been applied to study local magnetic fields at the proton sites of water molecules intercalated together with alkali cations in layered transition metal dichalcogenides. The chemical shift anisotropy of the Ax(H2O)y[MX2] compounds (A = Na, K; M = Ti, V, Nb, Mo, Ta, W; X = S, Se) depends greatly on M and on the reduction degree x. It appears to be proportional to the anisotropic Pauli paramagnetic susceptibility and to the host material density of states at the Fermi level. For the intercalation compounds of TiS2 and NbS2 the structure of the d(z)2 band has been determined. The ''rigid-band model'' could be confirmed. Exceptional results for TaS2 and MoS2 host lattices are discussed.