A novel two-dimensional coordination polymer constructed from bi-capped Keggin molybdenum–vanadium polyoxoanions and nickel ethylenediamine complexes

A novel two-dimensional (2-D) solid material [Ni(en)2]2{SiMoVI8VIV6O42[Ni(en)2]2}·4H2O 1 (en = ethylenediamine) has been hydrothermally synthesized and structurally characterized by IR, UV–Vis spectrum, elemental analysis, XRD, ESR, XPS, X-ray diffraction analysis, magnetic property analysis and electrochemistry study. Single-crystal X-ray analysis reveals that the 2-D framework of compound 1 is based on Mo/V/Si bicapped Keggin clusters interconnected by nickel ethylenediamine complexes. Magnetic susceptibility measurement indicates that compound 1 exhibits antiferromagnetic coupling interactions.