A MU-OXO-BIS[IRON(III) PORPHYRIN] COMPLEX

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