Synthesis, crystal structure and magnetic properties of poly[[diaqua{μ6-2-[bis­(carboxyl­atometh­yl)amino]­terephthalato}­dicobalt(II)] 1.6-hydrate]

The asymmetric unit of the polymeric title compound {[Co2(C12H7NO8)(H2O)2]·1.6H2O}n comprises two CoII ions, which are coordinated by fully deprotonated 2-aminodi­acetic terephthalic acid (adtp4–) and terminal water mol­ecules in distorted octa­hedral N1O5 and O6 coordination environments. The title compound features tetra­nuclear CoII units bridged by κ3O:O:O′- and κ3O:O,O′-carboxyl­ate groups, which are joined into ribbons via syn–anti carboxyl­ate bridges. The parallel adtp4– ligands with an alternately reversed arrangement further link adjacent CoII ribbons into (010) layers, which are assembled into a three-dimensional supra­molecular network via inter­molecular hydrogen bonds. The disordered water solvent mol­ecules are situated in channels parallel to [100]. Magnetic measurements and analyses reveal that the title compound displays anti­ferromagnetic behaviour. The purity of the title compound was characterized by X-ray powder diffraction.