Self-asembly Chemistry Of 1, 3, 4-Oxadiazole Bridging Imine And Secondary Amine Ligands And Schiff-base Ligands

The chemistry of organic-inorganic coordination polymers and supramolecular complexes has recently become area of increasing interest. 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 compounds. The synthesis and charaterization of infinite one-, two-, and three-dimensional networks have been an area of rapid growth. In the thesis, a series of novel oxadiazole bridging ligands and asymmetry Schiff-base ligands have been synthesized. The coordination chemistry of these novel ligands with transition metal ions was investigated. The coordination chemistry based on one of the two ligands with metal ions was primarily investigated. Totally 23 new coordination compounds were prepared by solution reactions methods, and fully characterized by IR, elemental analysis and single-crystal X-ray diffraction. The solid state luminescent properties of selected coordination compounds were investigated primarily.1. The coordination chemistry based on 1, 3, 4-oxadiazole bridging ligands end-capped by chelating Schiff-base coordination sites with inorganic Cu(II), Co(II), Zn(II) salts has been investigated. Five new coordination compounds, namely {[Cu2(L1)2]·2CH2Cl2} (1), {Co2(L2)2} (2), {[Zn2(L2)2]·0.5CH2Cl2} (3), {[Cu2(L3)2]·4CH2Cl2} (4), were synthesized based on them, respectively. Their single crystal structures and luminescent properties were investigated in the solid state. In addition, we investigated the adsorption and desorption properties of the coordination compound (1) for CH2Cl2, CHCl3, CCl4, THF, ClCH2CH2Cl, CO2 and so on, get the flowing coordination compounds {[Cu2(L1)2]·CH2Cl2} (5), {[Cu2(L1)2]·2CH2Cl2} (1'), {[Cu2(L1)2]·2CHCl3} (6), {[Cu2(L1)2]·2CHCl3} (6'), {[Cu2(L1)2]·2CH2Cl2} (1''), and characterized the process by single-crystal X-ray diffraction and TGA.2. The coordination chemistry based on 1, 3, 4-oxadiazole bridging imine organic ligands with inorganic Mn(II), Cd(II), Co(II) and Hg(II) salts has been investigated. Six new coordination compounds and polymers, namely {[Mn(L12)2(SCN)2]·CH2Cl2}n (7), {[Cd(L12)(SCN)2]·CH2Cl2}n (8), {Co(L12)2Cl2} (9), {[Hg(L14)Cl2]2} (10), {[Co(L15)2Cl2]·2CH2Cl2·2EtOH}n (11) and {Cd(L15)(ClO4)2}n (12), were synthesized based on them, respectively. Their single crystal structures were investigated in the solid state.3. The coordination chemistry based on 1, 3, 4-oxadiazole bridging asymmetry organic ligands with inorganic Ag(I) salts has been investigated. Six new coordination compounds and polymers, namely {Ag(L17)SO3CF3}n (13), {Ag(L17)H2PO4}n (14), {[Ag(L17)ClO4·C7H8}n (15), {Ag2(L17)2(ClO4)}n (16), {[Ag(L18)ClO4]·C6H6}n (17) were synthesized based on them, respectively. Their single crystal structures were investigated in the solid state.4. The coordination chemistry based on asymmetry Schiff-base ligands with inorganic Ag(I) and Co(II) salts has been investigated. Five new coordination compounds, namely {Cu(E)2}n (18), {[Ag(L20)SO3CF3]·CH2Cl2}n (19), {Co(L21)2Cl2·0.5(CH2O)}n (20), {Ag(L22)2SO3CF3} (21) were synthesized based on them, respectively. Their single crystal structures were investigated in the solid state.5. The coordination chemistry based on triazole carboxylic acid ligands with inorganic Cd(II) and Co(II) salts by hydrothermal reaction has been investigated. Two new coordination compounds, namely {Cd(L25)(H2O)}n (22), {[Co(L25)2(H2O)2]·2(H2O)}n (23) were synthesized based on them, respectively. Their single crystal structures were investigated in the solid state.6. The luminescent properties of selected organic ligands and coordination compounds were investigated in the solid state. The results show that the emission wavelength and intensity of free organic molecules were significantly affected by their incorporation into the metal-containing coordination compounds.The results reported herein demonstrate that the use of bent 1, 3, 4-oxadiazole bridging ligands and asymmetry Schiff-base ligands as precursors to bind transition metal ions, is in fact a new and efficient approach for synthesis of novel supramolecular networks with interesting chemical and physical properties.