Ni III -embedded polyoxovanadate: Synthesis, structure and magnetic properties

A NiIII-embedded pseudosandwich-type polyoxovanadate, K2H5[NiIIIV14O40]·19H2O (1) was synthesized by conventional aqueous solution method and characterized. This polyanion contains two monolacunary Lindqvist-type {V5O18} units and a distorted square-grid {NiV4O22}. It is also the first example of NiIII-containing POV and the second 3d transition metal embedded tetradecavanadate. Moreover, the electrochemical and magnetic properties of compound 1 have also investigated.