Solid-state tellurium-125 nuclear magnetic resonance studies of transition-metal ditellurides†

Abstract

Solid-state ¹²⁵Te NMR studies of inorganic compounds containing tellurium in oxidations states ranging from –II to VI have been made. The chemical shift tensors of Te(OH)₆, TeCl₄, TeO₂ and elemental tellurium have been determined by simulation of magic angle spinning (MAS) NMR spectra. Binary transition-metal ditellurides have been studied by MAS and static ¹²⁵Te NMR techniques. The observed MTe₂ NMR shifts range from ca. 500 to 8000 ppm [from aqueous Te(OH)₆] and are shown to be correlated with the expected tellurium oxidation state. Separation of the chemical shift and Knight shift contributions has been attempted.