Synthesis,crystal structures and spectral properties of cobalt (Ⅱ) complexes:[ CoL (N_3) ] ·ClO_4 and CoL (N_3)_2 [L=tris ((3,5-dimethylpyrazol-1-yl) methyl) amine

Two monomeric cobalt(Ⅱ)complexes,CoL(N3)] ClO4(1)and CoL(N3)2(2),where L is tris((3,5-dimethylpyrazol-1-yl)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 atoms of the tris((3,5-dimethylpyrazol-l-yl)-methyl)amine ligand,and the metal center is in distorted trigonal bipyramidal environment.Complex 2 is six coordinated distorted octahedron with the two azide nitrogen atoms and four nitrogen donors of the tris((3,5-dimethylpyrazol-1-yl)-methyl)amine ligand.The solution behaviors of the title complexes have been further investigated by UV-Vis,and 1H NMR analysis.It is found that the formation of 1 and 2 depends 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.

Synthesis,crystal structures and spectral properties of cobalt (II) complexes: [ Col (N3) ] · ClO4 and CoL (N3) 2 [L = tris( (3,5‐dimethylpyrazol‐1‐yl) methyl)amine]

Two monomeric cobalt(II) complexes, CoL(N₃)]ClO₄ (1) and CoL(N₃)₂ (2), where L is tris((3,5‐dimethylpyrazol‐yl) 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 atoms of the tris((3,5‐dimethyipyrazol‐1‐yl)‐methyl) amine ligand, and the metal center is in distorted trigonal bipyramidal environment. Complex 2 is six coordinated distorted octahedron with the two azide nitrogen atoms and four nitrogen donors of the tris((3,5‐dimethylpyrazol‐l‐yl)‐methyl) amine ligand. The solution behaviors of the title complexes have been further investigated by UV‐Vis, and ¹H NMR analysis. It is found that the formation of 1 and 2 depends on the molar ratio of the azide ion to metal salt and ligand. Complex 1 attached with one aside group is more stable and easy to generate than complex 2 incorporated with two azide groups, and the reasons were well discussed.