X-ray study of the third polymorphic structure of μ-oxo-bis[(octaethylporphinato)iron(III)]: [(OEPFe)2O)]

Exposure of a dichloromethane solution of [OEPFeIIICl], where OEP is the dianion of octaethylporphyrin, to dioxygen results in its transformation into the μ-oxo bridged compound [(OEPFe)2O)]. The structure of [(OEPFe)2O)] is determined by X-ray diffraction analysis. It contains binuclear centrosymmetric [(OEPFe)2O]. The Fe atom is five-coordinated to four N atoms of the porphyrin ring and to one bridging O atom. The compound is characterized by an average Fe-N bond length of 2.096 Å. The Fe-O bond distance is 1.7739(12) Å, the Fe-O-Fe bond angle is 180.0° and the two porphyrin rings are parallel. Crystal data: triclinic crystal system, a = 10.915(4) Å, b = 12.951(4) Å, c = 13.403(4) Å, α = 118.06(1)°, β = 100.33(1)°, Γ = 102.43°, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$P\bar 1$$\end{document} space group, V = 1144.5(1) Å3, Z = 1.