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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 tetra-phenyl-porphyrin perchlorate. It crystallizes as a new polymorphic modification in addition to the ortho-rhom-bic form previously reported [Hoffman et al. (1972 ▸). J. Am. Chem. Soc.  94 , 3620-3626; Swepston &amp; Ibers (1985 ▸) Acta Cryst. C 41 , 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 tetra-phenyl-porphyrin ligand. The Fe III -tetra-phenyl-porphyrine 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).

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