The Metal-organic Complexes Constructed By2,3,5,6-tetrabromoterephthalic Acid And Transition Metals

Due to the wide applications of metal-organic complexes in photoelectricity, magnetism,catalysis, ion exchange, adsorption and molecular recognition etc., investigation on themetal-organic complexes constructed by transition metals ions and organic ligands is an activeresearch field in coordination chemistry, supramolecular chemistry and crystal engineering inrecent years.In this thesis, by the use of ₂,3,5,6-tetrabromoterephthalic acid （H₂TBTA） andcombination with the auxiliary ligands [2,₂’-bipyridine （bipy）, 1,3-bis（4-pyridyl）propane（BPP）, 1,10-phenanthroline （phen）] assembling with transitional metal ions, we havesynthesized 10 novel metal-organic complexes. All of these complexes have been determinedby single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction analysis,thermogravimetric analysis and infrared spectroscopy. The main contents are as follows:1. Two novel Cd and Cu metal-organic complexes based on H₂TBTA and bipy ligandshave been successfully assembled in the same experiment situation:[Cd₂（bipy）₄（TBTA）（HTBTA）₂] （1） and {[Cu（bipy）（TBTA）（H₂O）]·H₂O}n（₂）. Complex 1 isbinuclear supramolecular structure, while complex ₂ shows diferent structural motif of the1D chain. There are many hydrogen bonding interactions in these metal-organic complexes,which may further stabilize coordination structure.₂. By use of the difusion method, The reactions of H₂TBTA ligand, BPP ligand andtransitional metal ions gave rise to five metal-organic complexes: [Zn（BPP）（TBTA）]n（3） and[M（BPP）₂（TBTA）（H₂O）₂]n[M=Cd（4）, Mn（5）, Co（6）, Ni（7）]. Due to transition metal ionscoordination ability is different, BPP ligand is flexible and can adopt different conformations,metal-organic complexes 3-7 show diferent structural motifs from the 1D chain （4-7） to the₂D grid （3） metal-organic networks.3. Based on transitional metal ions, H₂TBTA ligand and phen ligand，three novelmetal-organic complexes have been successfully assembled:{[M（phen）₂（TBTA）]·CH₃OH·H₂O}n[M=Cu（8）, Cd（10）] and [Co（HTBTA）₂（phen）₂] （9）. Their crystal structures show different structure motifs: 1D chain （8 and 10） and mononuclearmolecule （9） metal-organic networks, respectively. The 3D supramolecular structures of thecomplexes 8-10 are constructed by hydrogen bonding andπ-πinteractions.