Abstract
The preparation and properties of crystalline colourless complexes of the composition MI[NbO(C2O4)2(dmso)2](M = NH4, K, Rb, or Cs; dmso = dimethyl sulphoxide), and MI[NbO(C2O4)2(tmso)2](M = NH4, K, Rb; tmso = tetramethylene sulphoxide) are described. The complexes were prepared by dissolving the corresponding MI salts of oxobis(oxalato)aquoniobates in dmso and tmso, respectively. Stability trends and i.r. spectra of these oxobis-(oxalato) bis(sulphoxide)niobate(V) series of complexes are discussed. According to chemical and i.r. evidence the complexes contain two oxygen-bonded sulphoxide ligands and the presence of seven-co-ordinate niobium(V) in these complexes is assumed.
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