A Series of Metal-Organic Frameworks Based on Mixed Ligand Strategy: Synthesis, Structures, and Properties

Taking advantage of a basic ligand (BPCH=2,6-bis(4-pyridyl methylidene)cyclohexanone) and three acid ligands (H2TP=terephthalic acid, H2IP=isophthalic acid, H(3)TMA=1, 3, 5 - benzenetricarboxylic acid), seven metal-organic frameworks (MOFs) 1-7 have been achieved by using this acid-base mixed-ligand synthetic strategy. These complexes were characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction, and thermogravimetric analysis. Diverse 3D structural characters of MOFs 1-3 or 2D structural characters of MOFs 4-7 have been observed. The fluorescence properties of these complexes have been explored, indicating that they had selectivity towards Fe3+ ions. Several complexes had shown certain performance for adsorbing dye molecules.