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

Abstract

Abstract The reaction of CoCl2·6H2O 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)(H2O)]·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.