Synthesis of new donor/acceptor 5-cyclopentadienyl and 5-indenyliron(II) complexes with p-benzonitrile derivatives. Crystal structures of [Fe( 5-C5H5)(CO)(P(OC6H5)3)(p-NCC6H4NO2)][BF4]·CH2Cl2 and [Fe( 5-C9H7)(CO)(P(OC6H5)3)(p-NCC6H4NO2)][BF4] - Garcia, M. Helena; Robalo, M. Paula; Teixeira, António P. S.; Dias, A. R.; Piedade, M. Fátima M.; Duarte, M. Teresa (2001)