Self-assembly Chemistry And Properties Based On 1,3,4-Oxadiazole Heterocyclic Ring, N-containing Carboxylic Acids Ligands And Schiff-Base Ligands

The chemistry of organic-inorganic coordination polymers and supramolecular complexes has recently become an active area of increasing interest internationally. Self-assembly of organic ligands and inorganic metal ions is one of the most efficient and widely used approaches for the construction of organic-inorganic composite materials. Recently, remarkable progress has been made in the area of molecular inorganic-organic hybrid polymers. The synthesis and characterization of infinite one-, two-, and three-dimensional networks have been an area of rapid growth. In this thesis, a series of ligands, respectively, by 1, 3, 4-oxadiazole heterocyclic ring containing ethynyl, Schiff-base containing ethynyl, semi-rigid N-containing carboxylic acids ligands and Schiff-base ligands containing 8-hydroxyquinoline were synthesized. The coordination chemistry based on these new ligands and metal ions was investigated. Totally 25 new coordination compounds were prepared and fully characterized by IR, elemental analysis, X-ray single-crystal diffraction. The solid luminescent properties and host-guest properties of selected coordination compounds were investigated.1. A series of bending organic ligands bridged by ethynyl were synthesized, which contain 1, 3, 4-oxadiazole heterocyclic ring or Schiff-base. Six coordination supramolecules were generated from self-assembly of 1, 3, 4-oxadiazole heterocyclic ring containing ethynyl groups or Schiff-base containing ethyny groups and metal ions. Their single crystal structures were characterized and investigated.2. Three coordination supramolecules were generated from self-assembly of double-armed oxadiazole with inorganic Ag(I) and Hg(II) salts. Host-guest chemistry and the tunable luminescent properties of compound 9 were investigated and realized guest-dependent luminescent properties.3. Two asymmetric semi-rigid N-containing carboxylic acids ligands were prepared and the self-assembly reaction with metal ions under hydrothermal conditions was investigated. We found the difference in the type of metal ions influenced the configuration of coordination supramolecules when they reacted with the same ligand.4. The coordination chemistry based on schiff-base ligands containing 8-hydroxyquinoline heterocycle with inorganic Cd(II) salts and different guest molecules has been investigated. Thirteen new coordination compounds were synthesized. Their single crystal structures were characterized and investigated, desorb and re-absorb guest benzene molecule and selective adsorption of compound 18 were investigated. Host–guest compounds 13–18 show an interesting guest-dependent photoluminescence.A series of 1, 3, 4-oxadiazole heterocyclic ring containing ethynyl, Schiff-base containing ethynyl, semi-rigid N-containing carboxylic acids ligands and Schiff-base ligands containing 8-hydroxyquinoline were synthesized. This study demonstrated that these ligands is in fact a new and efficient approach for synthesis of novel supramolecules systems with interesting chemical and physical properties. Also, we investigated partial new coordination supramolecules with host-guest chemistry,selective adsorption and the tunable of luminescent properties.