[{μ-C(OC2H5)}(CO)4Fe2C{(OC2H5)(P-CF3C6H4)(η-C7H7}]

The crystal structure of tetracarbonyl-1κ 2 C,2κ 2 C-μ-{2-[α-ethoxy-4-(trifluoromethyl)benzylidene-1κC α ]-1(1,2-η):2(3,4,5,6-η)-1,3,5-cycloheptatriene}-μ-ethoxymethylidyne-1:2κ 2 C-diiron has been determined by X-ray diffraction analysis. The Fe atoms coordinated by carbonyl and cycloheptatriene groups are unsymmetrically bridged by a carbyne ligand. The extensively delocalized bonding may be found over the entire metal-ligand framework