Cyanide bridged hexanuclear iron complexes

The hexanuclear complexes [Fe2(NO3)2(μ-OR)2] [NC-Fe(dppe)Cp]4(PF6)2 with OR=OMe or OEt were obtained from Fe(Py)3(NO3)3 and Cp(dppe)Fe–CN in methanol or ethanol. They were identified by a structure determination and by their electrochemical data. Their ν(CN) band positions indicate that the central Fe2(μ-OR)2 cores are very strong electron acceptors, which is underlined by strong intervalence transfer bands in the NIR.