Structures And Fluorescent Probe Properties Of Metal Organic Frameworks Based On Diacid Ligands

Metal-organic frameworks（MOFs）have been widely applied in the fields of energy storage,medicine,catalysis,sensing and etc.due to its various structure,large specific surface area and low density.In this work,we aim to study the synthesis,structure and fluorescence property of novel structure MOFs which are based on H₂tda（hiophene-2,5-dicarboxylic acid）ligand with rich-electron.X-ray single crystal diffraction characterization and spectroscopic characterizations were carried out,respectively.In addition,the ability of detection in NACs,metal ions and aions based on fluorescence property are important work in this study.The main research contents and results are as follows:The synthesis of MOFs based on the mixture ligands of diacid and triazine.Two MOFs:Cu₂（tpt）₂（tda）₂·H₂O（1）and Zn₂（tpt）（tda）₂·H₂O（2）base on mixed ligands of H₂tda and tpt(2,4,6-Tri（pyridin-4-yl）-1,3,5-triazine were successfully synthesized under solvothermal condition.Compound 1 has a 3D structure with four connecting nets,and compound 2 has a 3D framework with triple interpenetration.Compound 1 and 2 has excellent thermostability and chemicalstability.And they are not only display great luminescent property in aqueous solution,but also maintain the integrity of framework in the acid-basic solution with different pH value and organic solvents.Both 1 and 2 exhibit admirable selectivity and sensitivity for PA and CrO₄^2-ions.In addition,2 also has high quenching constant and low detection limit to Fe³⁺in water solution.The recycle experiment further explore potential for 1 and 2 in the filed of detection.The synthesis of MOF based on single ligand.Compound 3（Pb-tda）with three-dimension pour structure was successful synthesized under solvothermal method which constructed from Pb（II）and single ligand-H₂tda.Compound 3 is a potential multifunctional fluorescent sensor for the detection of 2,4,6-trinitrophenol,CrO₄^2-and Fe³⁺.It not only has a high quenching constant and a low detection limit,but also can resist interference of other analogues.Furthermore,3 behaves excellent stability which can steadily exist in different organic solution and acid-base solution.