Synthesis Of Multifunctional Metal Organic Complexes And Its Application In Environmental Analysis

The metal organic complexes are assembled with organic ligands and metal ions by coordination and hydrogen bonds and π-π stacking interactions, which form multifunctional self-assembly porous materials. The metal organic complexes not only shows the rich and colorful structure of topology, but also has a broad application prospect in many fields.(1) In this paper, we selected bis-(3,5-dicarboxyphenyl) terephthalamide (L1) and 2,5-bis-(3,5-dicarboxyphenyl)thiopheneamide (L2) as the organic linkers and 1,10-phenanthroline as auxiliary ligand to synthesize six metal organic complexes with transition metal ions:[Zn(L1)0.5(1,10-phen)(H20)] 2H2O (1), [Cd(L1)0.5(1,10-phen)(H20)]2H20 (2), [Mn2L1(1,10-phen)2] DMF0.5H2O (3), [Mn(1,10-phen)(SO4)(H2O)2] (4), [Cd(L2)(2H2O)] 3H2O DMF (5) and [Zn2(L2)(4,4’-bpy)(CH3OH)(2H2O)]3.5H2OCH3OH (6) and X-ray diffraction analysis was used to determine the structure of metal organic complexes. The complexes were characterized by UV-Vis diffuse reflectance spectra, FT-IR, X-ray powder diffraction (PXRD), fluorescence spectra, thermogravimetric (TG) and so on.(2) The effect of 1-5 on the fluorescence of aromatic compounds was studied. The experimental results show that the complexes 1-5 have different degrees of fluorescence quenching and enhancement, and can be used for the selective detection of aromatic compounds. Compared with the literature, we synthesized the metal organic complexes as the sensing material and its detection limit is lower. In addition, we also take the complexes 1 and 2 as an example, carried on the 5 cycle experiment research. The results show that the complexes 1 and 2 have good cycling stability, which have potential applications in the selective identification of trace aromatic compounds.(3) Based on the optical properties of 1-5 in the ultraviolet region, we also studied the application of them as a photocatalyst in the degradation of organic dye Luo Danming B (RhB). The experimental results show that the metal organic complexs can effectively degrade organic dyes, which is widely used in the treatment of organic dyes wastewater. In addition, we studied the cyclic stability of metal organic complexes as the photocatalyst by 1 and 3. From the viewpoint of mechanism, the mechanism of metal organic complexes as a photocatalyst is the hydroxyl radical.