Zinc(II), nickel(II) and cadmium(II) coordination polymers based on the ligand oxamide N,N-bis(4-phthalic acid): synthesis, structural characterization and magnetic properties

Three coordination polymers based on the new ligand oxamide N,N -bis(4-phthalic acid), namely [Zn( L ) 0.5 -(2,2′-bpy)] n (1), [Ni 2 (2,2′-bpy) 4 ( µ 2 -Ox)] L ·3H 2 O (2) and [Cd( L )(1,10-phen)] (3) [ L = oxamide N,N -bis(4-phthalic acid)], (2,2′-bpy = 2,2′-bipyridine), (1,10-phen = 1,10-phenanthroline), have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction: compound 1 is one-dimensional ladder-like coordination polymer, compound 2 exhibits a three-dimensional structure resulting in extensive hydrogen bonds built with the help of lattice water molecules, compound 3 also exhibits a three-dimensional supramolecular structure. All compounds were also characterized by elemental analysis, IR spectra and thermogravimetric analysis; furthermore, the magnetic measurements for 2 reveal antiferromagnetic coupling between the nickel(II) ions.