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Keywords:

  • Polyoxometalates;
  • Tungsten;
  • Boron;
  • Iron;
  • Structure elucidation

Abstract

The reaction of [HBW11O39]8–, (WO4)2–, and Fe3+ (1:2:3 ratio) in water at pH 1.5 resulted in [{FeIII(H2O)3}2(WO2)(HBW11O39)2]8– (1), the first 3d-metal-substituted tungstoborate whose structure differs from that of a monosubstituted Keggin framework. Polyanion 1 is composed of an unprecedented 23-tungsto-2-borate subunit stabilized by FeIII coordination at the external positions. The linkage mode of the 11-tungstoborate fragments in 1 evidences that substitution of tungsten by 3d metals can occur in the capping positions of the {BW13} skeleton.