Synthesis, Structure And Properities Of 2-(2-Hydroxyphenyl)benzimidazole And Its Transition Metal Complexes

In resent decades the compound contained 2-benzimidazole group and its metal complexes have been the object of numerous investigations, because of their good property and application foreground, in biology, pharmacology, photo-electricity material, supermolecule construction and the other research fields. In the thesis, we have selected the 2-(2-hydroxyphenyl)benzimidazole(HPBI) as the target, found a novel, environmentally-friendly, high-yield, simple and convenient synthesis method and studied its IR, UV-Vis, ¹HNMR, crystal structure and solid fluorescence spectra. Simultaneity, more than ten the first transition metal complexes with the deprotoned ligand have been synthesized and their crystal structure, IR, UV-Vis, cyclic voltammetry, thermal property, fluorescence property and variable temperature solid magnetic susceptibility were also reported.1. On the basis of perusing a lot of literatures, according to the number of the 2-benzimidazole group, we have discussed the structural characters of this kind of compounds which before and after coordinated with transition metal ions and classified them. Here, the synthesis, property and its transition metal complexes about compound 2-(2-hydroxyphenyl)benzimidazole have been emphasized dissertation. In the part, the purpose and purport of the selected subject were put forward.2. A novel synthesis method of HPBI was reported and was characterized by IR, UV-Vis, ¹HNMR and X-ray single crystal diffraction. Seven the first transition system metal complexes with the ligand have been efficiently synthesized and characterized by element analysis, molar conductance, IR, UV-Vis, TG-DTG-DSC. They are Mn^III[(C₁₃H₉N₂O)₂Cl]CH₃OH (1), Cu(C₁₃H9_N2O)₂CH₃OH (2), Co(C₁₃H₉N₂O)₂CH₃OH (3), Zn(C₁₃H₉N₂O)₂CH₃OH (4), Ni(C₁₃H₉N₂O)₂ (5), Mn^III(C₁₃H₉N₂O)₂(CH₃COO) (6), Fe^III[(C₁₃H₉N₂O)₂Cl]CH₃OH (7). The proposed structure of these complexes have been depicted. The solid fluorescence spectra of HPBI and part complexes show that the Zn( II) complex have the strongest fluorescence.3. Using diffusion and hydrothermal methods, three single crystals of the fourmononuclear complexes Co(C|3H9N2O)2-2DMF (8), Cu(C|3H9N2O)2-2DMF (9), Zn(C|3H9N2O)2-2DMF (10), Co(C|3H9N2O)2-(ll) containing deportoned HPBI were reported. The results of element analysis, IR, UV-Vis, cyclic voltammetry were also discussed. Here, we compared their structures and found they had similar coordination structures, but through hydrogen bonds they structured a different and interesting supermolecule respectively.4. A dinuclear Mn(IV) complex Mn2O2(C|3H9N2O)4-2Py5H2O (12) and a trinuclear Ni(II) complex ^i3(CuH9N2O)5(CH3OHXCH3CH2OH)]Cl (13) have been synthesized and characterized by element analysis, IR, UV-Vis, TG, cyclic voltammetry, respectively. The crystal structure of the dinuclear Mn (IV) complex shows that there are intramalecular n'"n stacking between benzimidazole rings(0.344nm) and a novel 2-D supermolecule net was constructed through the hydrogen bonds among five lattice water molecules which formed distorted tetrahedral geometry, the adjacent phenolate oxygen atoms and non-coordinated benzimidazole nitrogen atom. The trinuclear Ni( II) complex was co-constructed by three Ni( II), five deportoned HPBI, one methanol, one ethanol and one CI' ion. Its crystal structure shows that two Ni(II) lie a distorted octahedral coordinated environment and the other Ni(II) lies distorted dipyramid coordinated environment. The three Ni( II) ions were bridged by four oxygen atoms from five ligands. The low-temperature (300-1.8K) magnetic measurement of the Ni( II) complex reveals that it is weakly antiferromagnetically coupled.