Abstract

Six antimony-phosphates have been studied by MAS high resolution solid state 31P NMR. Correlations have been drawn between NMR chemical shifts and structural data. They show that the 31P resonance line moves towards high field when the number of bridging oxygens in the PO 4, group increases. The chemical shift anisotropy is related to the dimensionality of the solid network. It is smaller for 3D lattices. Water intercalation in layered phosphates leads to a shift of the 31P resonance towards high or low field suggesting that protonation of some (PO 4) 3− group occurs. A correlation between the P-O π bonding and the chemical shift is also proposed.

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