Synthesis,Structure And Luminescence Properties Of Coordination Polymers Based On Nitrogen-containing Carboxylic Acid Ligands

In recent years,the coordination polymers have been attracting more attention by scientific researchers because of their interesting structural features and wide application prospects.Moreover,the coordination polymers show great potential in the fields of gas adsorption and separation,chemical sensing,energy storage and conversion,drug release,and biological imaging,especially the luminescent chemical sensing.In this thesis,three kinds of nitrogen-containing carboxylic acid organic ligands were selected to self-assembly with rare earth metal ions and transition metal ions by the solvothermal reaction and novel coordination polymers with different structures were successfully synthesized.Routine characterizations of novel coordination polymers were carried out by means of elemental analysis,infrared spectroscopy,thermogravimetric analysis,single-crystal X-ray diffraction analysis,luminescence test,and further study on luminescent sensing properties of a coordination polymer with red characteristic emission was carried out.The main research content is as follows:1.Isomorphic compound 1-3 were synthesized by the solvothermal reaction of H2L1 and rare earth metal ions(La3+,Ce3+,Pr3+).Besides,compound 4 was synthesized by the solvothermal reaction of H2L2 and Zn2+,and compound 4 shows obvious blue luminescence.2.Compound 5 was synthesized by the solvothermal reaction of H2L2 and Eu3+ and shows obvious red characteristic luminescence.Besides,compound 5 exhibits good thermal stability and moisture stability.Based on control of guest water molecules and direct dual emissions of ligand and Eu3+ the quantitative luminescence detection of humidity(33.0%-85.1%)and the self-calibrating ratiometric quantitative luminescence detection of temperature(10-150 K)were realized via compound 5.It is important that this is the first example of the dual function of luminescence sensing for quantitatively detecting temperature and humidity using MOFs materials.3.Compound 5 exhibits good chemical stability,the first example of ratiometric and colorimetric luminescence sensing of Cd2+ and F-using a single Ln-MOF has developed via compound 5,and the first example of recyclable vapoluminescent sensing for HCl and NH3 using Ln-MOFs has also been developed via compound 5.