A diketiminate-bound diiron complex with a bridging carbonate ligand

Abstract

Reduction of carbon dioxide by a diiron(I) complex gives μ-carbonato-k3 O:O′,O′′-bis-{[2,2,6,6-tetra- methyl-3,5-bis-(2,4,6-triisopropyl-phenyl)heptane-2,5-diiminate(1-)-k 2 N,N′]iron(II)} toluene disolvate, [Fe2(C41H65N)2(CO3)] ·2C7H8, a diiron(II) species with a bridging carbonate ligand. The asymmetric unit contains one diiron complex and two cocrystallized toluene solvent mol-ecules that are distributed over three sites, one with atoms in general positions and two in crystallographic 1̄ sites. Both Fe II atoms are n2-coordinated to diketiminate ligands, but n1- and n2-coordinated to the bridging carbonate ligand. Thus, one FeII center is three-coordinate and the other is four-coordinate. The bridging carbonate ligand is nearly perpendicular to the iron-diketiminate plane of the four-coordinate FeII center and parallel to the plane of the three-coordinate FeII center. © 2009 International Union of Crystallography.