Crystal structure of di-ethyl-ammonium dioxido{)--[(pyri-din-2-yl)car-bon-yl-azan-idyl]pyri-dine-2-car-box-imid-ato}vana-date(1-) monohydrate.

The title compound, (CHN)[V(CHNO)O]·HO, was synthesized aerial oxidation on refluxing picolinohydrazide with ethyl picolinate followed by addition of VO(acac) and di-ethyl-amine in methanol. It crystallizes in the triclinic crystal system in space group . In the complex anion, the dioxidovanadium(V) moiety exhibits a distorted square-pyramidal geometry. In the crystal, extensive hydrogen bonding links the water mol-ecule to two complex anions and one di-ethyl-ammonium ion. One of the CH groups in the di-ethyl-amine is disordered over two sets of sites in a 0.7:0.3 ratio.