Crystal structure of poly[[aqua­(μ2-pyrazine-κ2N:N′)(μ2-2,3,5,6-tetra­chloro­benzene-1,4-di­car­boxyl­ato-κ2O1:O4)copper(II)] hemihydrate]

Abstract

The Cu^II ions in this compound form a square-pyramidal coordination environment and are bridged by the Cl₄bdc²⁻ and pyz ligands to form a two-dimensional (2D) layer. The 2D layers are alternately stacked by hydrogen-bonding and C—Cl⋯π inter­actions to form a three-dimensional network.

The asymmetric unit of the title compound, {[Cu₂(C₈Cl₄O₄)₂(C₄H₄N₂)₂(H₂O)₂]·H₂O}_n or {[Cu₂(Cl₄bdc)₂(pyz)₂(H₂O)₂]·H₂O}_n comprises of a Cu^II ion, one tetra­chloro­benzene­dicarboxyl­ate ion (Cl₄bdc²⁻), one pyrazine ligand (pyz), and one and a half water mol­ecules. The Cu^II ion exhibits a five-coordinated square-pyramidal geometry with a CuN₂O₃ coordination environment comprising two oxygen atoms of the Cl₄bdc²⁻ ligands, one oxygen atom of a water mol­ecule, and two nitro­gen atoms of the pyz ligands. The carboxyl­ate group is almost perpendicular to the benzene ring and shows monodentate coordination to the Cu^II ion. The Cu^II ions of these units are bridged by both the Cl₄bdc²⁻ and pyz ligands to form two-dimensional (2D) layers, which are linked by alternating hydrogen-bonding and C—Cl⋯π inter­actions to yield a three-dimensional network.