Abstract
Solid-state 31P and 29Si n.m.r. spectroscopy has been used to characterise a number of heteropolyanion salts. A significantly larger chemical shift anisotropy was seen for the phosphorus in the dimeric P : Mo = 2 : 18 Dawson structure than for the P : Mo = 1 : 12 Keggin unit. Two inequivalent phosphorus sites are seen for the 2 : 18 anion. Solution and solid-state chemical shifts agree very well allowing the identification of various degrees of tungsten substitution in the compound of nominal composition Cs3[PMo11WO40]. Structures having the composition 1 : 11 ([SiW11O39]8–) show an observable difference in the solid-state isotropic chemical shift from 1 : 12 species thus allowing the detection of the first stages of decomposition of the Keggin unit.
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