Crystal structure of a polymorph of μ-oxido-bis­[(5,10,15,20-tetra­phenyl­porphyrinato)iron(III)]

The title compound, [Fe(2)(C(44)H(28)N(4)O)(2)O], was obtained as a by-product during the synthesis of Fe(III) tetra­phenyl­porphyrin perchlorate. It crystallizes as a new polymorphic modification in addition to the ortho­rhom­bic form previously reported [Hoffman et al. (1972 ▸). J. Am. Chem. Soc. 94, 3620–3626; Swepston & Ibers (1985 ▸) Acta Cryst. C41, 671–673; Kooijmann et al. (2007 ▸). Private Communication (refcode 667666). CCDC, Cambridge, England]. In its crystal structure, the two crystallographically independent Fe(III) cations are coordinated in a square-planar environment by the four N atoms of a tetra­phenyl­porphyrin ligand. The Fe(III)-tetra­phenyl­porphyrine units are linked by a μ(2)-oxido ligand into a dimer with an Fe—O—Fe angle close to linearity. The final coordination sphere for each Fe(III) atom is square-pyramidal with the μ(2)-oxido ligand in the apical position. The crystal under investigation consisted of two domains in a ratio of 0.691 (3): 0.309 (3).