catena-Poly[[[bis(N,N-dimethylformamide)iron(II)]-{μ-2,2′-bis(diphenylphosphinoyl)-N,N′-[(1R,2R)-cyclohexane-1,2-diyl]dibenzamide}] bis(perchlorate) N,N-dimethylformamide disolvate]

Abstract

The title extended solid coordination compound, {[Fe(C44H40N2O4P2)(C3H7NO)2](ClO4)2·2C3H7NO}n, was crystallized unexpectedly from the reaction mixture containing the Trost ligand (1R,2R)-(+)-1,2-diaminocyclohexane-N,N′-bis(2′-diphenylphosphinobenzoyl) and Fe(ClO4)2·6H2O in a 1:1 ratio in dimethylformamide (DMF) under reflux conditions. The polymeric complex is characterized by FeII metal centers that are coordinated by two oxidized Trost ligands, each coordinated in a bidentate fashion in a square plane, along with two DMF molecules above and below the plane [average Fe—ODMF = 2.086 (4) Å], forming an overall pseudo-octahedral geometry. The Trost ligand binds adjacent FeII centers, each FeII being bound through the O atom of one of the phosphine oxides [average Fe—OPPh2 = 2.115 (4) Å] and the carbonyl O atom of the adjacent amide [average Fe—Oamide = 2.192 (3) Å]. Disorder is observed in the co-solvated solvent: there are two DMF molecules per FeII centre, which were modeled as one DMF molecule with complete occupancy and the other being modeled in two positions with equal occupancy. Disorder was also observed with one of the perchlorate anions, which was modeled in two positions with 0.75:0.25 occupancy.