Two new complexes constructed by semirigid carboxylic acid ligand: Synthesis, crystal structures, absorption of organic dye and photoluminescence properties

Abstract

Two metal–organic frameworks (MOFs), [Ag2(H2L)(4,4′-bipy)(μ3-OH)]n (1) and [Zn3(L)2(bpe)2(H2O)2]n (2) were synthesized under hydrothermal conditions using the tricarboxylate and N-containing ligands (H3L=3-(3-carboxyphenoxy) phthalic acid, 4,4′-bipy=4,4′-bipyridine, bpe=1,2-di(pyridine-4-yl)ethene), and structurally characterized by single-crystal X-ray diffraction analysis, FT-IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA), furthermore, fluorescent spectra and absorption properties are discussed. Structural analysis reveals that Complex 1 is built from H3L, 4,4′-bipy and trinucleated Ag to form a three-dimensional (3D) network with a (4,4)-connected topology and a symbol of (63.83)4(86). As for 2, a trinucleate secondary building units (SBU), linked by the H3L ligand generated a one-dimensional (1D) chain, then the two adjacent 1D chains are joined together by bpe ligand, yielding a 1D trapezoidal chain. Our successive application studies indicate that complex 1 shows rapid uptake for methyl orange (MO) and iodine (I2), compound 2 is an impressive Zn-MOF based sensor for detecting Fe3+ ions in aqueous solution.