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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]

✍ Scribed by Zhi-Hui Zhang; Hai-Long Yang; Zhi-Hong Ma; Ai-Di Qi

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
434 KB
Volume
18
Category
Article
ISSN
0256-7660

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✦ Synopsis

Abstract

Two monomeric cobalt(II) complexes, [CoL(N~3~)]ClO~4~ (1) and CoL(N~3~)~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 ^1^H 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.

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## Abstract The reaction of the new, bis(bidentate), potentially dinucleating ligand 4‐isobutyl‐3,5‐di(2‐pyridyl)‐4__H__‐1,2,4‐triazole (ibdpt) with M(ClO~4~)~2~·6H~2~O (M = Co^II^, Ni^II^ or Cu^II^) in a1:1 molar ratio in MeCN affords the dinuclear complexes [Co^II^~2~(ibdpt)~2~(MeCN)~2~(H~2~O)~2~