Synthesis and crystal structure of the two-dimensional coordination compound potassium oxo-bis(hydroxylamido)-pyridine-2,3-dicarboxylato-vanadate(V)

The crystal structure of the title compound, K-2[VO(C7H3O4N)(NH2O)(2)(H2O)](2), is composed of KO9 and VO5N2 polyhedra connected through pyridine-2,3-dicarboxylate (2,3-dipicolinate) bridges. The VO5N2 coordination polyhedron is a pentagonal bipyramid, with hydroxylamido and dipicolinato ligands being bidentate. The axial positions are occupied by the terminal oxo ligand and one oxygen atom from a deprotonated carboxylate group. The oxygen atoms from hydroxylamido and the nitrogen atoms belonging either to the pyridine ring or to the hydroxylamido occupy the equatorial positions and form an approximate pentagonal plane. The irregular KO9 polyhedra are linked, sharing edges and planes to form infinite chains. These chains are linked by the dipicolinate bridges to form layers. The distorted VO5N2 polyhedron is grafted on to the layer by the dipicolinate carboxylate O atom. Adjacent layers are connected through N-H center dot center dot center dot O hydrogen bonds to form a three-dimensional supramolecular structure.