title: Poly[[bis-(μ(2)-6-methyl-pyrazin-2-carboxyl-ato-κN,O:N)copper(II)] dihydrate].
abstract: In the title compound, {[Cu(C(6)H(5)N(2)O(2))(2)]·2H(2)O}(n), the Cu(II) ion (site symmetry ) is coordinated by two N,O-bidentate ligands and two N-monodentate ligands in a distorted CuO(2)N(4) octa-hedral geometry. Each anion acts as a bridge between two cations, thus forming a two-dimensional polymeric network parallel to the ab plane. The packing is consolidated by O-H⋯O hydrogen bonds. One of the O atoms of the ligand and both water mol-ecules are disordered.
authors.forename: Chuan-Gang
authors.initials: CG
authors.lastname: Fan
authors.forename: Xin-Ting
authors.initials: XT
authors.lastname: Wei
authors.forename: Linwei
authors.initials: L
authors.lastname: Li