Mg7V4O16(OH)2(H2O): A magnesium vanadate with a novel 3D magnesium oxide open framework

Hydrothermal reaction of V2O5 and Mg(BO2)2(H2O) in H2O afforded a novel magnesium vanadate with a non-centrosymmetric structure, Mg7V4O16(OH)2(H2O). The structure of Mg7V4O16(OH)2(H2O) features a novel 3D openframe network of magnesium(II) oxide with tunnels along c-axis based on 6- and 12-member rings (MR), the V(2)O4 tetrahedra are located at 6-MR tunnels whereas V(1)O4 tetrahedra and the 1D chains composed of the face-sharing Mg(1)O6 octahedra are located at the 12-MR tunnels.