Abstract
A new cobalt(II) complex, [Co(H2 oxado)3 ]C2 O4 H2 oxado·2H2 O (H2 oxado = oxamide dioxime), has been synthesized in aqueous solution and characterized by elemental analysis and single crystal X-ray structure determination. The complex crystallizes in the triclinic space group P-1, with the parameters a = 9.46(4), b = 11.84(5), c = 12. 81(5) Å, α = 104.94(6), β = 99.29(5), γ = 106.73(5), V = 1284(9) Å3, Z = 2. The central cobalt(II) cation is pseudo-octahedrally coordinated by six imino N atoms of the neutral oxamide dioxime ligand. In the solid state, each of the following bricks, namely the cationic complexes, the oxalate dianions as well as the oxamide dioxime crystallization molecules, pile up parallel to the a axis. The bulk structure is consolidated by an extended three-dimensional network of hydrogen bridgings—that link the ionic partners, oxamide dioxime and water molecules to one another—and by coulombic interactions.
Highlights
Introduction(2015) Synthesis and Crystal Structure of the First Example of a Tris-Chelated Co(II) Complex Based on Oxamide Dioxime Ligand
Transition metal complex cations of the form [M(H2oxado)3]n+ (M = metal(II) or metal(III), n = 2 or 3, H2oxado =How to cite this paper: Bebga, G., Nfor, E.N., Mbiangué, Y.A., Djonwouo, P.L. and Nenwa, J. (2015) Synthesis and Crystal Structure of the First Example of a Tris-Chelated Co(II) Complex Based on Oxamide Dioxime Ligand
It has been observed previously that in aqueous solution, the CoII ion generally reacts with the oxamide dioxime ligand, yielding the familiar trischelated CoIII complex cation, [Co(H2oxado)3]3+ [6]-[8]
Summary
(2015) Synthesis and Crystal Structure of the First Example of a Tris-Chelated Co(II) Complex Based on Oxamide Dioxime Ligand. It has been observed previously that in aqueous solution, the CoII ion generally reacts with the oxamide dioxime ligand, yielding the familiar trischelated CoIII complex cation, [Co(H2oxado)3]3+ [6]-[8]. In our current research program which is focused on fabricating multifunctional materials involving N,N’- or O,O’chelating ligands, the [Co(H2oxado)3]3+ building block and its homologous nickel(II) complex, [Ni(H2oxado)3]2+, have proven to be good partners in the formation of hydrogen-bonded functional solid-state assemblies [9] [10]. The present finding turns out to be quite interesting, in as much as it provides, to the best of our knowledge, the first example of a complex salt containing the dipositive [Co(H2oxado)3]2+ cation, as highlighted in Scheme 1
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