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The reaction of CoCl 2 ·6H 2 O with mixed ligands of 2,2′-oxybis(benzoic acid) (2,2′-H2oba) and  trans -1,2-bis(4-pyridyl)ethylene (bpe) under hydrothermal conditions produced a new 3D cobalt(II) supramolecular architecture {[Co(oba)(bpe)(H 2 O)]·1/2bpe}  n   ( 1 ), which was structurally characterized by elemental analysis, infrared spectroscopy, thermogravimetric analyses, and single-crystal X-ray diffraction. The results show that the Co(II) ions are connected to form an infinite polymeric chain by bpe ligands in complex  1 . Due to strong intermolecular O–H···O hydrogen bonds, the adjacent chains are connected to generate a double-chain structure. These double chains are joined by O–H···N hydrogen bonding to produce a 2D supramolecular architecture. Furthermore, through intermolecular C–H···O hydrogen bonds, the layers are linked into a 3D supramolecular structure. Magnetic susceptibility measurements have indicated that complex  1  shows weak antiferromagnetic interactions between adjacent Co(II) ions.

A 3D supramolecular architecture based on 2,2′-oxybis(benzoic acid) and trans -1,2-bis(4-pyridyl)ethylene as ligands for Co(II)