Crystal structure of bis-(ammonium) bis-[penta-aqua-(di-methyl-formamide)-zinc(II)] deca-vanadate tetra-hydrate.

The crystalline product (NH)[Zn(CHNO)(HO)][VO]·4HO was success-fully isolated from an HO/DMF solvent combination by evaporation at ambient temperature. The salt crystallizes in the 2/ space group. Imidazole, initially used in the synthesis but not present in the product, and DMF solvent appear to affect the synthesis and crystallization as structural-directing agents. In the title compound, the complex cation [Zn(HO)(DMF)] acts as a counter-ion without being directly coordinated to the deca-vanadate anion. An extensive framework of hydrogen bonds integrates the whole architecture as evidenced by X-ray crystallography. The polyoxometalate [VO] lies on a center of symmetry while the complex cation [Zn(HO)(DMF)] links three adjacent anions through a set of 2 + 2 + 3 hydrogen bonds.