Abstract

The EPR spectra of a series of mononuclear complexes [ CpFe(dppe)SR] PF6R = C6H5 (1), C3H7 (2),p-C6H4Br (3) and the binuclear [ CpFe(dppe)-S-CH2CH2-S-CpFe(dppe] (PF6)2 (4) were measured. All the paramagnetic complexes exhibit intense signals in both solid state as well as in CH2Cl2solution. Analysis of the spectra indicates a pseudooctahedral structurefor the complexes except for complex (2) for which a tetragonaldistortion in solid state was observed. Some degree of delocalization ofthe unpaired electron for (3) and (4) was suggested. The stabilization of the radicals by the thiolate ligands is discussed