Open Chain Crown Ether Carboxylic Acids, Including Five Yuan Heterocyclic Ligands And Ligand Coordination Self-assembly And Nature Of Research

The chemistry of organic-inorganic coordination polymers and supramolecularcomplexes has recently become an active area of increasing interest internationally.Thestudy of coordination-driven self-assembled discrete and polymeric metal-organicframeworks （MOFs） is a very active interdisciplinary research area. Thesemetal-organic assemblies have intriguing structures and potential applications as smartoptoelectronic, magnetic, and catalytic materials. In this thesis, a series of bent ligandsbridging by the open-chain crown ethers, 1, 3, 4-oxadiazole, 1, ₂, 4-triazole andfluorescein ligands were used. The coordination chemistry based on theseligands,co-ligands and metal ions was investigated. Totally 17 new coordinationcompounds were prepared and fully characterized by IR, elemental analysis, X-raysingle-crystal diffraction and powdered X-ray diffraction.Ⅰ. A new {₂[Cd（4,4’-bipy）（L1）（H₂O）]（4,4’- bipy）11（H₂O）}nwas synthesized based onpolyether-bridged carboxyl ligand,4,4’- bipy and cadmium （Ⅱ）.With the host-guestaccoupled, seven new coordination polymers were synthesized based on it:{0.39Tb（H₂O）83+ Cd（Ⅱ）-MOF}n（₂）; {0.6₂Eu（H₂O）83+ Cd（Ⅱ）-MOF}n（3）; {0.45Nd（H₂O）83+ Cd（Ⅱ）-MOF}n（4）; {0.37Tb/0.16Eu（H₂O）83+ Cd（Ⅱ）-MOF}n（5）; {0.₂8Tb/0.65Eu（H₂O）83+ Cd（Ⅱ）-MOF}n（6）; {0.₂0Tb/0.3₂Eu（H₂O）83+ Cd（Ⅱ）-MOF}n（7）;{0.31Tb/0.34Nd（H₂O）83+ Cd（Ⅱ）-MOF}n（8）. Its tunable luminescent properties wasinvestigated.Ⅱ. Seven new coordination polymers were synthesized based on 1, 3, 4-Oxadiazole and1,₂, 4-Triazole bridged ligands with co-ligands: {Cd（L₂）₂（NO——3）₂}n（9）; {Cd（L₂）₂（OTf）₂}n（10）; {Zn（L3）₂（BDC）}n（11）;{Ni（L4）₂L’}n（1₂）; {L5（H₂BDC）（H₂O）}n（13）;{Cd（L5）（BDC）}n（14）; {Co（L5）₂（HBDC）₂}n（15）.Their single crystal structures wereinvestigated.Ⅲ. Two new coordination polymers were synthesized based on the semi-rigid organicligands bridged by 4-amino-1,₂,4-triazole：{Hg₂（L6）₂Cl4（CH₂Cl₂）}n（16）; {Hg₂（L6）₂Br4（CH₂Cl₂）}n（17）, Their single crystal structures were investigated. This study demonstrated that the use of the flexible open-chain polyether-bridgedligands and 1, 3, 4-oxadiazole, 1, 2, 4-triazole as precursors with N-containingtemplates to bind metal ions, is in fact a new and efficient approach for synthesis ofnovel supramolecular systems with interesting fluorescent chemical and physicalproperties.