Reaction of [Fe(N-2)(depe)(2)] with carbon dioxide gives trigonal bipyramidal [Fe(eta(2)-CO2)(depe)(2)], where the coordinated CO2 lies on equatorial plane by an eta(2)-fashion and converts into dimethyl ether and [FeX(CO)(depe)(2)]X (X = I, OTf) on interaction with methyl halide or triflate.