Synthesis, crystal structures and spectral properties of cobalt(Ⅱ) complexes: [ CoL(N3) ] ·ClO4 and CoL(N3)2 [ L = tris ( (3,5- dimethylpyrazol-l-yl) methyl) amine ]

• 来源期刊: 中国化学(英文版)
• 年，卷（期）: 2000,（6）
• 所属期刊栏目: Articles
• 页码范围: 842-848
• 页数: 7页
• 语种: 英文

摘要

Twomonomeric cob a lt(Ⅱ)complexes, [CoL(N3)]·ClO4 (1) and CoL(N3)2 (2), where L is tris((3,5-di methyl)amineyl) methyl)amine, were synthesized and their crystal structures were determined by X-ray diffraction technique. Complex 1 is five coordinated with one azide nitrogen atom and four nitrogen ato ms of the tris((3,5-dimethylpyrazol-l-yl)-methyl) amine ligand, and the metal center is in distorted trigonal bipyramidal environmnt. Complex 2 is six coordinated distorted octahedron with the two azide nitrogen atoms and four nitrogen donors of the tris((3,5-dimethylpyrazol-l-y l)-methyl)amine ligand. The solution behaviors of the title complexes have been further investigated by UV-Vis, and 1H NMR analvsis. It is found that the formation of1 and2 de - pends on the molar ratio of the azide ion to metal salt and ligand. Complex 1 attached with one azide group is more stable and easy to generate than complex 2 incorporated with two azide groups, and the reasons were well discussed.