Design,Synthesis,Crystal Structures And Properties Of Organic Skeleton Complexes Modified By Carboxylic Acid

In recent years,a variety of environmental problems are becoming more and more serious.Among them,the water pollution caused by dyes has attracted more attention.Therefore,developing high-efficiency and low energy consumption's catalyst to degrade organic dyes is one of the urgent problems.As a photocatalyst,TiO₂ has been widely used for its high activity and strong stability.However,due to the wide band gap value of TiO₂,its absorption spectrum only accounts for a small part of the solar spectrum,which cannot make full use of solar energy.Metal-organic frameworks have a wide range of light response and can make full use of solar energy,thus making up the disadvantage of TiO₂.Moreover,it has adjustable pore channels and no secondary pollution after degradation.Therefore,it has become the preferred catalyst to deal with the environmental problem.Organic skeleton complexes modified by carboxylic acid are one of the most common photocatalytic materials.The complexes have good coordination abilities,abundant coordination modes and favor the transfer of electrons and energy.Therefore,in this work,four different kinds of metal organic complexes were constructed.Among them,2,4,6-triiodo-1,3,5 benzenetricarboxylic acid,N-(4-pyridine methyl)-L-aspartic acid,2,6-bis(2-pyrazinyl)pyridine-4-benzoic acid and niacin were ligands and transition metals Co(?),Zn(?),Cd(?),Cu(?)and Ni(?)were metal sources.They were characterized by IR spectrum,UV-Vis spectrum,X-ray single crystal diffraction,X-ray powder diffraction and TG analysis et al.At the same time,the properties of photocatalytic degradation and adsorption on organic dyes for some complexes were studied.