Abstract
Three novel Ln(III)-based coordination polymers, {[Ln2 (2,4-bpda)3 (H2O)x]·yH2O}n (Ln = La (III) (1), x = 2, y = 0, Ce (III) (2), Pr (III) (3), x = 4, y = 1) (2,4-H2bpda = benzophenone-2,4-dicarboxylic acid) have been prepared via a solvothermal method and characterized by elemental analysis, IR, and single-crystal X-ray diffraction techniques. Complex 1 exhibits a 3D complicated framework with a new 2-nodal (3,7)-connected (42·5) (44·51·66·8) topology. Complexes 2 and 3 are isomorphous, and feature a 3D 4-connected (65·8)-CdSO4 network. Moreover, solid-state properties such as thermal stabilities and luminescent properties of 1 and 2 were also investigated. Complex 1 crystallized in a monoclinic space group P21/c with a = 14.800 (3), b = 14.500 (3), c = 18.800 (4) Å, β = 91.00 (3), V = 4033.9 (14) Å3 and Z = 4. Complex 2 crystallized in a monoclinic space group Cc with a = 13.5432 (4), b = 12.9981 (4), c = 25.7567 (11) Å, β = 104.028 (4), V = 1374.16 (7) Å3 and Z = 4.
Highlights
Lanthanide metal-organic frameworks (Ln-MOFs) have attracted ever-increasing interest because of their intriguing structural diversity, and due to special photophysical properties [1,2,3,4].due to their high coordination numbers and mutable coordination geometries, the assembly of lanthanide coordination polymers with specific geometry and properties might be uncontrollable [5], so designing and controlling lanthanide metal-organic frameworks (Ln-MOFs) with presupposed topological networks and functions remains a difficult and challenging task
Among the various aromatic carboxylate ligands, rigid phenyl, biphenyl- or polyphenylcarboxylates with π-conjugated systems have been more extensively employed to provide a great variety of topological architectures with desired properties due to their remarkable versatile coordination modes [9,10]
We have focused on unsymmetrical semirigid aromatic dicarboxylatic ligand benzophenone-2,4-dicarboxylic acid (2,4-H2bpda) to construct new coordination polymers with different structures and properties
Summary
Lanthanide metal-organic frameworks (Ln-MOFs) have attracted ever-increasing interest because of their intriguing structural diversity, and due to special photophysical properties [1,2,3,4]. We have focused on unsymmetrical semirigid aromatic dicarboxylatic ligand benzophenone-2,4-dicarboxylic acid (2,4-H2bpda) to construct new coordination polymers with different structures and properties. We report the synthesis, crystal structure of three new Ln (III)-based coordination polymers, {[Ln2 (2,4-bpda) (H2O)x]·yH2O}n (Ln=La (III) (1), x = 2, y = 0, Ce (III) (2), Pr (III) (3), x = 4, y = 1,) (2,4-H2bpda = benzophenone-2,4-dicarboxylic acid). The thermogravimetric analysis and luminescent properties of 1 and 2 were discussed
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