Synthesis Of Ni(Ⅱ) Based Polymer And Its Application In Fluorescence Detection

With the progress of society,people’s life is getting better and better.The development of industry is the basis of everything.However,with these developments,some problems have been exposed,and environmental pollution is one of them.Water is the source of life.The pollutants in water contain some heavy metal ions,such as Hg,Cr,Pb,etc.In addition to heavy metal ions,some transition metal ions exceeding the allowable limit(such as Fe³⁺and Al³⁺)are also considered to be toxic water pollutants.Therefore,it is very important to accurately detect ions at ultra-low concentration.More and more porous materials have been developed as sensors to detect various pollutant ions.In recent years,Coordination Polymers（CPs）and Metal-Organic Frameworks（MOFs）have become the focus of research.In particular,one,two and three dimensional organic-inorganic hybrid polymers constructed from metal ions and organic ligands have remarkable structures and unique physical properties.As a large category of coordination polymers,luminescent coordination polymers have great sensing attraction due to their high selectivity,sensitivity and recoverability.They have been used to detect metal cations,antibiotics,p H,etc.However,rapid detection and accurate identification of ions are of great significance to the nuclear industry,life and health and environmental protection.Therefore,it is very important to develop a fast and efficient detection method.In this paper,two new coordination polymers were synthesized.By means of single crystal X-ray diffraction,X-ray powder diffraction,X-ray photoelectron spectroscopy,infrared spectroscopy,ultraviolet visible absorption spectroscopy,thermogravimetry and fluorescence,the structure of crystal materials was analyzed,the basic properties of complexes and their fluorescence sensing properties were characterized.The specific research contents are as follows:1.Using anhydrous NiCl₂ as metal source and Tpom as ligand,a new Ni coordination polymer C₁₃H_11.5Cl N₂Ni_0.5O₂（1）was synthesized by hydrothermal solvothermal method.Complex 1 has two-dimensional interpenetrating structure,can remain stable in DMF and has excellent peak luminescence properties.By fluorescence analysis,Complex 1 can selectively detect Fe³⁺ions in DMF with a detection limit of 0.42 ppm.2.A new Ni based coordination polymer C₄₀H₃₅N₄Ni_1.5O₁₁（2）was synthesized by hydrothermal solvothermal method with Ni（NO₃）₂·6H₂O as metal source,TPOM and 4,4’-Biphenyldicarboxylic Acid as ligand.Compared with Complex 1,Complex 2 has a more stable three-dimensional structure and best water stability.By fluorescence analysis,Complex 2 can selectively detect Al³⁺and Fe³⁺ions in water by turn on and turn off,respectively,and has a very low detection limit.The LOD of Complex 2 for Al³⁺ion is 2 ppb and that for Fe³⁺ion is 0.27 ppm.It is a very promising fluorescent detector.