Piperazine-1,4-diium bis­(pyridine-2,6-dicarboxyl­ato-κ3 O 2,N,O 6)cobaltate(II) tetra­hydrate

The asymmetric unit of the title complex, (C4H12N2)[Co(C7H3NO4)2]·4H2O, consists of one piperazinediium dication, one [Co(py-2,6-dc)2]2− dianion (where py-2,6-dc is pyridine-2,6-dicarboxyl­ate) and four water mol­ecules. The piperazinediium cation adopts a chair conformation and the CoII ion is six-coordinated in an N2O4 environment, having a distorted octa­hedral geometry. In the crystal, inter­molecular O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds link the components, forming a three-dimensional network