A μ-Oxo-bis[iron(III) porphyrin] Complex

Abstract

Partial nitration of iron(III) 2,3,7,8,12,13,17,18-octaethylporphyrin chloride [Fe III (OEP)Cl] gives the μ-oxo-bis(5,15-dinitro) compound μ-oxo-bis[2,3,7,8,12,-13,17,18-octaethyl-5,15-dinitroporphyrinato)iron(III)], [Fe 2 (C 36 H 42 N 6 O 4 ) 2 O], which is similar to other μ-oxo-iron(III) porphyrin complexes but with less ruffling of the porphyrin structure. The porphyrin planes are not parallel [the angle between plane normals is 169 (2)°] and the Fe-O-Fe angle is 167.9(3)°. As expected, the Fe atoms are significantly displaced from the porphyrin planes towards the bridging O atom : 0.46 A for Fe1 and 0.49 A for Fe2. The two porphyrin residues are eclipsed with respect to their C atoms, but the nitro groups are staggered by 90° from one residue to the other.