Poly[trans-diaquabis(μ2-3-pyridylacetato)copper(II)

Abstract

The title copperII coordination polymer, trans-[Cu(C7H6NO2)2(H2O)2]n, was obtained from a solvothermal reaction of 3-pyridylacetic acid hydro­chloride with Cu(ClO4)2·6H2O. The mol­ecule is centrosymmetric, so pairs of equivalent ligands lie trans to each other in a slightly distorted octa­hedral geometry. The CuII center is coordinated by two water mol­ecules [Cu—O = 2.424 (4) Å], two pyridyl N atoms [Cu—N = 2.031 (4) Å], and two carboxyl­ate O atoms [Cu—O1 = 1.968 (4) Å]. All Ocarboxyl­ate—Cu—Ocarboxyl­ate, Owater—Cu—Owater and N—Cu—N bond angles are 180° due to the inversion symmetry of the complexes. Each 3-pyridylacetate anion uses its pyridine N atom and one carboxyl­ate O atom to connect two CuII ions, generating two-dimensional sheets parallel to (212). Each complex exhibits two intra­molecular O—H⋯O hydrogen bonds with angles at hydrogen of 156°. Adjacent two-dimensional layers are connected via inter­molecular O—H⋯O and weak C—H⋯O hydrogen-bonding contacts, resulting in a three-dimensional framework structure with oxygen as a trifurcated acceptor atom.