Study On Synthesis Of Metal-organic Coordination Polymer Based On A New Polycarboxylic Acid And Application For Recognition Of Fluorinion

Porous Metal-Organic coordination polymers(also called as Metal-Organic Frameworks,MOFs)are ordered frame structures centered by metal ions,coordinated with organic ligands under suitable conditions,and self-assembled,which have the features of unsaturated metal sites,porosity and easy functionalization.Metal-Organic coordination polymers with luminescent properties have good application prospects in ion detection,small molecule detection,drug delivery and so on.Therefore,choosing suitable metal ions and organic ligands to construct novel metal-organic framework compounds with luminescent properties and exploring their application have already become a research hotspot.In this dissertation,a novel aromatic carboxylic acid ligand[1-(3,5-dicarboxyphenyl)-2,5-dimethyl-lH-pyrrole-3,4-dicarboxylic acid](H4ppdc)with good rigidity and n conjugated systems was synthesized.A two-dimensional and plane coordination polymer[Zn(H4ppdc)3·H2O]n was synthesized using this ligand and Zn2+ ions under solvothermal conditions.The coordination polymer was characterized by PXRD?TG-DTA?FT-IR and FL techniques,and the solid-state photoluminescence behavior of the organic ligand and coordination polymer were compared.It was found that the fluorescence intensity of the coordination polymer was significantly enhanced compared with the organic ligand.Then we studied its fluorescence response to halogen ions in detail and used it to capture halogen ions that are contaminated to the environment.The experimental results show that compared with chlorine,bromine,and iodine ions,the fluorescence quenching of this compound for fluoride ion is more obvious.The detection limit of the coordination polymer for fluoride ion is 6.539×10-7 mol/L.The coordination polymer shows that it equipped with potential application in the detection of fluoride ion.