New Metal–Organic Framework Solids Built from Barium and Isoelectronic Chelidamic and Chelidonic Acids

Two new Ba(II) metal–organic framework solids bearing the chelidamate [Ba2(C7H3NO5)2(μ-H2O)(H2O)6]·2H2O (1) and chelidonate [Ba(C7H2O6)(H2O)] (2) ligands were synthesized and characterized by IR, elemental, thermal, photoluminescent and X-ray diffraction analyses. In complex 1 the chelidamate dianion exists in two tautomeric forms, in which the enol form exhibits unprecedented (К1, К1) (К1) (К2, К2, μ2, μ2)-μ7 heptadentate coordination while the...