Crystal structure of catena-poly[[di­aqua­di­imida­zole­cobalt(II)]-μ2-2,3,5,6-tetra­bromo­benzene-1,4-di­carboxyl­ato]

Abstract

In [Co(Br₄bdc)(im)₂(H₂O)₂], the Co^II ions are bridged by the Br₄bdc²⁻ ligand, forming one-dimensional chains, which are inter­connected by inter­chain N–H⋯O and O–H⋯O hydrogen-bonding and π–π inter­actions, yielding a three-dimensional network.

The asymmetric unit of the title compound, [Co(C₈Br₄O₄)(C₃H₄N₂)₂(H₂O)₂]_n or [Co(Br₄bdc)(im)₂(H₂O)₂]_n, comprises half of Co^II ion, tetra­bromo­benzene­dicarboxylate (Br₄bdc²⁻), imidazole (im) and a water mol­ecule. The Co^II ion exhibits a six-coordinated octa­hedral geometry with two oxygen atoms of the Br₄bdc²⁻ ligand, two oxygen atoms of the water mol­ecules, and two nitro­gen atoms of the im ligands. The carboxyl­ate group is nearly perpendicular to the benzene ring and shows monodentate coordination to the Co^II ion. The Co^II ions are bridged by the Br₄bdc²⁻ ligand, forming a one-dimensional chain. The carboxyl­ate group acts as an inter­molecular hydrogen-bond acceptor toward the im ligand and a coordinated water mol­ecule. The chains are connected by inter­chain N—H⋯O(carboxyl­ate) and O—H(water)⋯O(carboxyl­ate) hydrogen-bonding inter­actions and are not arranged in parallel but cross each other via inter­chain hydrogen bonding and π–π inter­actions, yielding a three-dimensional network.