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By using a semi-rigid tripodal ligand 5-(4-carboxybenzyloxy)isophthalic acid (H 3 L) and lanthanide metal ions (Nd 3+ , Tb 3+ ), two novel lanthanide metal-organic frameworks, namely, {[Nd 2 L 2 (DMF)4] DMF} n ( 1 ), and {TbL(DMF)(H 2 O)} n ( 2 ), were synthesized under mild solvothermal conditions and structurally characterized by X-ray single crystal diffraction. Compounds 1 and 2 are isostructural, in which L 3- ligands linked dinuclear lanthanide metal-carboxylate units to form non-interpenetrated 3D network with (3,6)-connected topology. Luminescent investigations reveal that compound 1 displays the near-infrared emission at room temperature, and compound 2 can be employed as selective probe for Cr 2 O 7  2  - anion in aqueous solution based on luminescence quenching. Moreover, compound 2 exhibits catalytic activity for cyclo-addition of CO 2 and epoxides under relatively mild conditions.

Two Lanthanide Metal–Organic Frameworks Based on Semi-Rigid T-Shaped Tricarboxylate Ligand: Syntheses, Structures, and Properties