Three kinds of 3D isomorphous and isostructural coordination polymers, namely, {[Ln 2 (PDA) 3 (H 2 O) 3 ]·0.25H 2 O} ∞ (Ln = La(1), Sm(2), and Gd(3)) (PDA 2− = pyridine-2,6-dicarboxylate anion) have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectroscopy, thermal analyses and single crystal X-ray diffraction. In these MOFs, Ln(III) centers adopt eight-coordinated and nine-coordinated with the N 1 O 7 and N 2 O 7 donor sets to construct distorted trianglar dodecahedron geometry and tricapped trigonal prism configurations, respectively. Based on the building block of tetranuclear homometallic Ln 4 C 4 O 8 unit (16-membered ring), 1-3 are connected into highly ordered 2D sheets via O-C-O linkers and further constructed into 3D architectures through hydrogen bonds. Crystallographic parameters suggest that the lanthanide contraction effect exist in these coordination polymers. Luminescent properties of the lanthanide-based MOFs (metal-organic frameworks) have been measured at room temperature, which reveal that they presenting ionselective characters toward certain metals, such as Mg
2+, Cd 2+ and Pb 2+ ions.
Two 3D isomorphous and isostructural complexes, namely, [Zn(BDOA)(bpy)(H 2 O) 2 ] n (1) and [Cd(BDOA)-(bpy)(H 2 O) 2 ] n (2); (BDOA = Benzene-1,4-dioxyacetic acid, bpy = 4,4'-bipyridine) were synthesized under hydrothermal conditions and characterized by means of elemental analyses, thermogravimetric (TG), infrared spectrometry, and single crystal X-ray diffraction. Complexes 1 and 2 crystallize in the triclinic system, space group P-1 and each metal ion in the complexes are six-coordinated with the same coordination environment. In the as-synthesized complexes, BDOA 2− anions link central metal ions to form a 1D zigzag chain [-BDOA 2− -Zn(Cd)-BDOA 2− -Zn(Cd)-] ∞ , whereas bpy pillars connect metal ions to generate a 1D linear chain [-bpy-Zn(Cd)-bpy-Zn(Cd)-] ∞ . Both infinite chains are interweaved into 2D grid-like layers which are further constructed into a 3D open framework, where hydrogen bonds play as the bridges between the adjacent 2D layers. Luminescent properties of complex 1 showed selectivity for Hg 2+ ion.
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