Jiang H, Xie YS, Zhou ZY, Xu XL, Liu QL (2003) Syntheses, structures and characterization of cobalt(II) and cobalt(III) complexes with N-benzylated polyamines and a terminal azido ligand. Journal of Coordination Chemistry 56(9), 825-832. [In English Estonian]

Web link: http://dx.doi.org/10.1080/0095897031000123804

Keywords:

crystal structures, cobalt complexes, polyamine complexes, azido ligand, crystal-structure, anionopentaaminecobalt(iii) complexes, metal-complexes, coordination, tris(2-benzimidazolylmethyl)amine, copper(ii), binding, amine,

Abstract: Mononuclear cobalt(II) and cobalt(III) complexes, [Co(trenb)(N(3))]Cl (1) and [Co(dienb)(N(3))(2)(OAc)] (2) (trenb =tris[2-(benzylamino)ethyl]amine, dienb=1,9-diphenyl-2,5,8-triazanonane) were synthesized and characterized by elemental analyses, IR and electronic spectra. Their crystal structures were also determined by X-ray diffraction analyses. In Complex 1, cobalt(II) is five-coordinate trigonal bipyramidal with one azido nitrogen atom and four nitrogen donors of the tripodal ligand, the chloride interacts weakly with one of the secondary amino groups of trenb via a hydrogen bond. In Complex 2, cobalt(III) is in a distorted octahedral coordination environment, consisting of three nitrogen atoms of the amine ligand, two azide nitrogen atoms and an oxygen atom of the acetate ion, a six-membered ring involving the hydrogen bond may stabilize the complex, which maintains its solid geometry in DMF as indicated by the electronic spectrum.