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

ABSTRACT: By using a semi-rigid tripodal ligand 5-(4-carboxybenzyloxy)isophthalic acid (H₃L) and lanthanide metal ions (Nd³⁺, Tb³⁺), two novel lanthanide metal-organic frameworks, namely, {[Nd₂L₂(DMF)4] DMF}_n (1), and {TbL(DMF)(H₂O)}_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 Cr₂O₇^2- anion in aqueous solution based on luminescence quenching. Moreover, compound 2 exhibits catalytic activity for cyclo-addition of CO₂ and epoxides under relatively mild conditions.

SUBMITTER: Xue YS 

PROVIDER: S-EPMC6572171 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature