Author(s)

Bader Belhaj Ali, Mohamed Salah Belkhiria, Michel Giorgi, Habib Nasri

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The bis(nitrito-N) cobalt(III) octaethylporphyrin derivative with the formula [K(18-C-6)(NO₂)_0.5(H₂O)_0.5]₂ [Co^III(OEP)(NO₂)₂] (1) (OEP = octaethylporphyrin and 18-C-6 is the crown ether18-crown-6) has been synthesized and characterized by UV-vis, IR and proton NMR spectroscopy which indicate, inter alia, that the cobalt ion presents the oxidation state III. The synthesis utilizes 18-crown-6 to solubilize potassium nitrite in the synthetic procedure. This compound crystallizes in the triclinic system, with the centric space group P-1 and the following unit cell parameters: 11.6724(2) Å, b = 12.5715(2) Å, c = 13.4722(3) Å, α = 101.1290(6)°, β = 106.6498(6)°, γ= 109.1507(6)°, Z = 1 and V = 1696.74(5) ų. The crystal structure has been solved and refined to R = 0.0499 and R(w) = 0.1319. The X-rays molecular structure of 1 shows that there is a relatively close interaction of both two NO₂^- axial ligands of the ion complex [Co^III(OEP)(NO₂)₂]^- with the potassium atoms of the two counterions [K(18-C-6) (NO₂)0.5(H₂O)_0.5]^0.5+. The title compound exhibits one-dimension polymer-like structure where “monomers” are linked together through strong O(H₂O)—H…O(nitrito-O) hydrogen bonds.

Cobalt(III) Porphyrin; X-Rays Diffraction; UV-Visible; ¹H NMR

Ali, B. , Belkhiria, M. , Giorgi, M. and Nasri, H. (2011) Synthesis, structural and spectroscopic characterization of the bis(nitrito-N) octaethylporphyrin cobalt(III) complex. Open Journal of Inorganic Chemistry, 1, 39-46. doi: 10.4236/ojic.2011.13006.