Syntheses and Structures of Two New Oxalate-bridged Transition-metal Supramolecular Polymers of [M(2-NH2py)2 (ox)]

Two new supramolecular polymers [M(2-NH2py)2 (ox)] [M = Co (1), Ni (2); 2-NH2py = 2-aminopyridine; ox = oxalate] were hydrothermally synthesized and characterized by elemental analyses, IR and single-crystal X-ray diffraction analyses. The isomorphic compounds 1 and 2 both possess one-dimensional zigzag chain structures, which are composed of [M(2-NH2py)2]2+ units bridged by tetradentate oxalate ligands to form three-dimensional supramo-lecular network via the C-H…O hydrogen bonds and π-π stacking interactions. Compound 1 displays antiferromagnetic interaction.