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Keywords:

  • Cluster compounds;
  • Poly­oxometalates;
  • Sandwich complexes;
  • Tungsten;
  • Electrocatalysis

Abstract

Four dimeric mononuclear sandwich-type tungstophosphate clusters of Na12H[FeIII(HPW7O28)2]·44H2O (1) and Na14[M(HPW7O28)2]·44H2O {M = CoII (2), CdII (3), MnII (4)} were successfully synthesized by reaction of Na2WO4·2H2O, H3PO4, and CH3COOH with FeCl3·6H2O, Co(CH3COO)2·4H2O, CdSO4·8H2O, and Mn(CH3COO)2·4H2O, respectively. Single-crystal X-ray diffraction analysis revealed that 14 are essentially isomorphous and crystallize in the triclinic space group Pequation image. Complexes 14 consist of two [HPW7O28]8– units incorporating a single FeIII, CoII, CdII, and MnII ion, respectively. Furthermore, the electrocatalytic behaviors of 14 in the reduction of nitrite were investigated.