A diketiminate-bound diiron complex with a bridging carbonate ligand

摘要

Reduction of carbon dioxide by a diiron(I) complex gives μ-carbonato-κ³ O:O′,O′′-bis­{[2,2,6,6-tetra­methyl-3,5-bis­(2,4,6-triisopropyl­phenyl)heptane-2,5-diiminate(1−)-κ² 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 mol­ecules that are distributed over three sites, one with atoms in general positions and two in crystallographic sites. Both Fe^II atoms are η²-coordinated to diketiminate ligands, but η¹- and η²-coordinated to the bridging carbonate ligand. Thus, one Fe^II 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 Fe^II center and parallel to the plane of the three-coordinate Fe^II center.