Author(s)

Imen Ketata, Lassad Mechi, Taïcir Ben Ayed, Michal Dusek, Vaclav Petricek, RachedBen Hassen

Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic.
Unité de Recherche de Chimie des Matériaux et de l’Environnement, Université de Tunis El Manar, Tunis, Tunisia.

New transition metal complex of Cobalt(III) of the ligand (E)-3-(1-(2-aminoethylimino)ethyl)-4-hydroxy-2H-chromen-2-one, derived from condensation of ethylene diamine with 3-acetyl-4-hydroxy-chromene-2-one have been synthesized by reaction of cobalt(III) salt and the ligand, in amounts equal to metal-ligand molar ratio of 1:2. Both the Schiff base and the complex of Co(III) were characterized by IR, UV-Vis, ¹H NMR- and ¹³C NMR-spectroscopy techniques. Single crystal X-ray diffraction investigation, at low temperature T = 120 K, shows that the cobalt complex is triclinic P-1, a = 10.426(5) ?, b = 11.3234(2) ?, c = 15.729(5) ?, α(°) = 70.102(4), β(°) = 86.049(4), γ(°) = 82.497(4), Z = 2, and its structure consists of isolated [Co(III)(C₁₃H₁₃N₂O₃)₂]⁺ complex cations with distorted octahedral geometry, ClO^-₄ counter anions, acetone solvent and water molecules. The crystal cohesion is stabilized by hydrogen bonds between ligands and water molecules, and ionic interactions between complex cations and counter anions.

Hydroxycoumarin Derivative; Co^III Complex; ¹H NMR; UV-Visible; Single Crystal X-Ray Diffraction

Ketata, I. , Mechi, L. , Ayed, T. , Dusek, M. , Petricek, V. and Hassen, R. (2012) Synthesis, characterization, spectroscopic and crystallographic investigation of Cobalt(III) schiff base complex with two perpendicular diamine coumarin ligands. Open Journal of Inorganic Chemistry, 2, 33-39. doi: 10.4236/ojic.2012.22006.