Synthesis of new types of polyoxometallate pillared anionic clays: 31P and 27Al MAS NMR study of the orientation of intercalated PW11VO404–

Abstract

A series of different new types of polyoxometallate pillared anionic clays are synthesized by ion-exchange reactions and characterized by elemental analysis, powder X-ray diffraction and IR spectroscopy; the observation of two ³¹P MAS NMR peaks for ZnAl–PW₁₁VO₄₀ provides experimental evidence for the orientation of the intercalated polyoxometallates with the C₂ axis predicted to be orthogonal to the layers.