Molecular chains in the structure of a zinc(II) complex with pyrazine-2,6-dicarboxylate and water ligands

Crystals of catena-[diaqua-(mu-pyrazine-2,6-dicarboxylato-N,N,O'-mu-N')]zinc(II) contain molecular chains in which the Zn(II) ions are bridged by pyrazine-2,6-dicarboxylate ligands via two symmetry-related oxygen atoms, each donated by a different carboxylic group [Zn-O(1) and O(1)(I): 2.182(2)Angstrom] and the hetero-ring nitrogen atom [Zn-N(1): 2.049(3)Angstrom] situated between them on one side and the second hetero-ring nitrogen atom [Zn-N(2)(II) 2.118(3)Angstrom] from the adjacent ligand on the other. The Zn(II) ion and four coordinating atoms are coplanar. Two symmetry related water molecules, [Zn-O3 and O: 2.116(2)Angstrom] situated above and below this plane complete the coordination around the Zn(II) ion to six atoms forming a distorted octahedron.