Supra-molecular Structure Study On Transitional Metallic Compounds Contanining Imidazole Ligands

Imidazole and benzimidazole are good extend ligands and a variety topologycomplexes can be generated by self-assembly. Great efforts have been expended on crystalengineering of supramolecule complex because of their fascinating structural diversity andpotential applications in the fields of molecular self-assembly, molecular recognitions,molecular catalysis, magnetic materials, optoelectronic materials，drug synthesis，gasabsorption，and so on.In this thesis, six transition metal compounds containing N, O-donor ligands aredesigned, synthesized and structural characterized, and the coordination behaviors andintermolecular weak interactions of these compounds are studied. The weak interactionssuch as hydrogen bonds，π-π stacking play a very important role in forming thecoordination supramolecule frameworks structure.1. Two new mononuclear complexes derived from AMB and second ligand KSCNhave been synthesized and characterized by elemental analysis, IR spectra, UV-visabsorption spectra. The crystal structure research shows that AMB acts as a bidentateligand, coordinating to metal ions by a nitrogen atomof imidazole and a nitrogen atom ofaliphatic amine. Both of the compounds （[Co（AMB）₂（NCS）₂] and [Ni（AMB）₂（NCS）₂]）are six-coordinated and in a distorted octahedral geometry.2. Two compounds with2-substituted benzimidazole ligands are prepared andcharacterized by elemental analysis, IR spectra, UV-vis absorption spectra. The crystalstructures are determined by X-ray single diffraction. The formulas of the compounds are[Zn（AMB）（H2O）SO4]·0.5H2Oand [Cu（AMB）₂H₂O]·SO₄.3. Two compounds containing imidazole ligand are obtained because the CDI ligandhydrolyzes to imidazole （Im）. The new complexes （[Ni（Im）₆]·SO₄·CH₃OH·2H₂O and[Co（Im）₆]·（NO₃）₂）] have been characterized by elemental analysis, IR and Uv-visspectroscopy. The coordination number in these complexes is six, and the coordinationenvironment is distorted octahedral.These six compounds all have two-dimensional or three-dimensional supramoleculenetworks, which are formed through hydrogen bonds and π-π stacking interaction.