Coordination Polymer Based On Aromatic Multicarboxylic Acid Ligands:Synthesis,Structure And Fluorescent Properties Studies

Coordination polymer is a hot spot for researchers today.It has superior functional properties and applications in the fields of gas storage/separation,heterogeneous catalysis,photoluminescence,magnetic materials,electrocatalysis,nonlinear optics,and so on.In this thesis,based on crystal engineering theory,we selected aromatic multicarboxylic acid ligands with flexible coordination modes to successfully synthesized ten Coordination polymer with novel structures.Then they were characterized and investigated by single-crystal X-ray diffraction?SCXRD?,Elemental analyses?EA?,Infrared spectrum analyses?IR?,Thermogravimetric analyses?TGA?,Powder X-ray diffraction?PXRD?,fluorescence analyses.The main work of this thesis includes the following three aspects:1.We utilized 4,4',4''-??1,3,5-triazine-2,4,6-triyl?tri?sulfanediyl??tri?benzoic acid??H₃L¹?as an organic ligand.Two coordination polymer were successfully synthesized under solvothermal conditions.And their chemical formulas are as follows:[Tb?L¹??H₂O?₂]_n?1?[Eu?L¹??H₂O?₂]_n?2?The complexes?1?-?2?were investigated by powder x-ray diffraction?PXRD?,thermogravimetric analyses?TGA?,and fluorescence analyses.Single crystal X-ray diffraction result of complex?1?-?2?revealed they are isostructural,and the complexes crystallize in the monoclinic system with the C2/c space group.Cu²⁺and Fe³⁺exhibited a relatively high quenching effect on the luminescence of complex?1?-?2?.2.We utilized 4,4?,4??-?benzene-1,3,5-triyltris?1H-pyrazole-3,1-diyl??tri?benzoic acid??H₃L²?as an organic ligand.Five coordination polymer were successfully synthesized under solvothermal conditions.And their chemical formulas are as follows:[Co₃?L²?₂?H₂O?₆]_n?3?[Mn₃?L²?₂?H₂O?₆]_n?4?[Sr₃?L²?₂?H₂O?₆]n?5?[Tb₇?L²?₇?H₂O?₉]_n?6?[Eu₇?L²?₇?H₂O?₉]_n?7?A part of the complexes?3?-?5?were investigated by powder x-ray diffraction?PXRD?,thermogravimetric analyses?TGA?,and fluorescence analyses.Single crystal X-ray diffraction result of complex?3?-?5?revealed they are isostructural,and the complexes crystallize in the monoclinic system with the P 2₁/c space group.Fe³⁺exhibited a relatively high quenching effect on the luminescence of complex?3?.Single crystal X-ray diffraction result of complex?6?-?7?revealed they are isostructural,and the complexes crystallize in the monoclinic system with the I 2/a space group.3.We utilized 3,5-bis?3?,5?-dicarboxylphenyl?-1H-1,2,4-triazole?H₄L³?as an organic ligand.Three coordination polymer were successfully synthesized under hydrothermal and solvothermal conditions.And their chemical formulas are as follows:[Co₂?L³??H₂O?₄]_n?8?[Co₂?L³??H₂O?₇]_n?9?[Cd₂?L³??HCOOH?₂]_n?10?Single crystal X-ray diffraction result of complex?8?revealed it crystallized in the monoclinic with the C2/c space group.The complex?9?was crystallized in the triclinic with the P-1 space group.The complex?10?was crystallized in the orthorhombic with the Cmme space group.