The Syntheses, Structures And Properties Of Coordination Complexes Based On1-(benzotriazole-1-methyl)-2-propyl Imidazole Ligands

The design and preparation of metal–organic coordination complexes have attractedwidespread interests for decades, not only due to their fascinating structures, such asmolecular cage, honeycomb, grid, ladder, rotaxane and catenane, but also promisingapplications in gas adsorption, magnetism, ion–exchange, catalysis, and luminescence. Sincerapid expansion in this field has been undergone in recent years, a growing interest hasfocused on controlled-synthesis of crystalline materials with the desired fascinating structuresand related versatile properties.In the reported coordination complexes, those containing nitrogen heterocycle and theirderivatives occupy a large proportion. They can not only coordinate to transition metal ions toform strong covalent bonds, but also have good intramolecular electron and energy transferperformance because of its conjugated π bond. When ligands containing nitrogen heterocyclecoordinate with metal ions, potential properties are likely to exhibit in generated complexes.Thus, more special materials with light, electricity and magnetism properties will be found. Inaddition, complexes containing this kind of ligands have good biological activity. Research onstructures and properties of this kind of complexes can help us to understand the biologicalactivities and the mechanism of the pharmacological activities.In the paper, we selected a derivative of benzotriazole,1–(benzotriazole–1–methyl)–2–propylimidazole (bpmi), an asymmetric multidentate ligand,to assemble with metal centers. Twelve novel complexes have been prepared successfully,[Cd(bpmi)2(NO3)2(CH3OH)]n(1),[Cd2(bpmi)2Cl2(N3)2(CH3OH)2]n(2),[Cd(bpmi)Cl2]n(3),[Cd(bpmi)(SCN)2]n(4),[Cd(bpmi)(N3)2]n(5),[Co(bpmi)2(Ac)2](6),[Co3(bpmi)4(SCN)6](7), [Co2(bpmi)2(N3)4](8),[Cu(bpmi)2(N3)2](9),{Cu3(bpmi)2(SCN)4[N(CH3)2O-]}(10),[Zn(bpmi)2(N3)2](11) and [Zn(bpmi)(IPA)](H2O)3(12). The structures of the complexes weredetermined and parsing to grasp effects of different counter anions on the formation of them.The results show that the size and coordination tendency of counter anions affects geometricconfigurations of central metal ion and coordination mode of ligand directly to guide thevarious complexes. In addition, the elemental analysis, infrared radiation spectra (IR),UV–Vis spectra, solid fluorescence and etc. of complexes have also been investigated.