Synthesis and structure of two polymeric barium–oxydiacetates: [Ba(oda) · H2O]n and [Ba(Hoda)2]n (H2oda: oxydiacetic acid)

The reaction of barium carbonate or hydroxide with oxydiacetic acid leads to the self-assembly of two barium oxydiacetate polymers in good yield: [Ba(oda) · H2O]n (1) and [Ba(Hoda)2]n (2). The products have been characterized by elemental analysis, IR, TGA and single crystal X-ray diffraction studies. The central barium atom in each mononuclear fragment is nine-coordinate in 1 and 10-coordinate in 2. These fragments are bridged by carboxylato groups in anti–anti conformation and through H-bonds bonding interactions forming complex 3D networks.