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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
Two novel lanthanide(III) organic frameworks based on a biphenyltetracarboxylate ligand: synthesis, structure and
Hongguo Hao1, Yuchen Wang1, Suxian Yuan1
1Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, People's Republic of China.
Abstract:
Two new two-dimensional lanthanide coordination polymers, namely poly[[tetra-μ2-acetato-tetraaquabis(μ4-biphenyl-3,3',5,5'-tetracarboxylato)tetrakis(dimethylacetamide)tetraterbium(III)] pentahydrate], {[Tb4(C16H6O8)2(C2H3O2)4(C4H9NO)4(H2O)4]·5H2O}n, (1), and poly[[tetra-μ2-acetato-tetraaquabis(μ5-biphenyl-3,3',5,5'-tetracarboxylato)tetrakis(dimethylacetamide)tetraeuropium(III)] tetrahydrate], {[Eu4(C16H6O8)2(C2H3O2)4(C4H9NO)4(H2O)4]·4H2O}n, (2), have been synthesized from biphenyl-3,3',5,5'-tetracarboxylic acid (H4bpt) and Ln(NO3)3·6H2O (Ln = Tb and Eu) under solvothermal conditions. Single-crystal X-ray structure analysis shows that the two compounds are isostructural and crystallize in the monoclinic P21/n space group. The crystal structures are constructed from bpt4- ligands (as linkers) and {Ln2(μ2-CH3COO)2} building units (as nodes), which topological analysis shows to be a (4,6)-connected network with sql topology. Compounds (1) and (2) have been characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and fluorescence analysis in the solid state. In addition, a magnetic investigation shows the presence of antiferromagnetic interactions in compound (1).
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