Abbreviations used in this paper: Porph; a generalized porphyrin dianion, TPP; dianion of the 5,10,15,20-tetraphenylporphyrin, TpivPP; dianion of ?,?,?,?-terakis(o-pivalamidophenyl) porphyrin (picket fence porphyrin), OEP; dianion of 2,3,7,8,12,13,17,18-octaethylporphyrin, cryptand-222; 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo [8,8,8]hexacosane, 18-C-6; 1,4,7, 10,13,16-hexaoxacyclooctadecane (18-crown-6), DMAP; 4-(N,N’-dimethylamino) pyridine. 1-MeIm; 1-methylimidazole, 1-2-Me2Im; 1,2-dimethylimidazole,

has been cited by the following article:

• TITLE: Synthesis, structural and spectroscopic characterization of the bis(nitrito-N) octaethylporphyrin cobalt(III) complex

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

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

  JOURNAL NAME: Open Journal of Inorganic Chemistry, Vol.1 No.3, October 24, 2011

  ABSTRACT: The bis(nitrito-N) cobalt(III) octaethylporphyrin derivative with the formula [K(18-C-6)(NO2)0.5(H2O)0.5]2 [CoIII(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) Å3. 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 [CoIII(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.