Synthesis, structures and properties of two 3D Cd(II) MOFs with bianthracene vinylpyridine and dicarboxylate ligands
摘要
Two three-dimensional (3D) Cd-based metal-organic frameworks (MOFs), [Cd(L1)(L2)]·(CH4O)16 (Cd-1) and [Cd(L1)(L3)]·(C3H7NO)1.5(CH4O)5 (Cd-2), have been rationally designed and synthesized by using 10,10’-bis((E)-2-(pyridin-4-yl)vinyl)-9,9’-bianthracene (L1), 1,4-benzenedicarboxylic acid (H2L2) or 4,4’-biphenyldicarboxylic acid co-ligand (H2L3) and CdCl2·4H2O under solvothermal conditions. The structures have been determined by single-crystal X-ray diffraction analyses and further characterized by IR spectra, UV-Vis spectra, and powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction analyses reveal that Cd-1 consists of a 3D network with one-dimensional (1D) channels, while Cd-2 with longer dicarboxylate ligands consists of a 3D network with interpenetration of two infinite structures. Moreover, the two MOFs exhibit strong luminescent emission in solid state at room temperature. The stability of Cd-1 and Cd-2 at different temperatures was analyzed by thermogravimetry.