TITLE:
Synthesis and Crystal Structure of the First Example of a Tris-Chelated Co(II) Complex Based on Oxamide Dioxime Ligand
AUTHORS:
Gouet Bebga, Emmanuel N. Nfor, Yves A. Mbiangué, Patrick L. Djonwouo, Justin Nenwa
KEYWORDS:
Crystal Structure, Cobalt(II) Complex, Oxamide Dioxime, Oxalate, Hydrogen Bridging
JOURNAL NAME:
Crystal Structure Theory and Applications,
Vol.4 No.2,
May
14,
2015
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.