Preparation of new cationic complexes [(η5-C5H5)Fe(dppe)L]PF6 with sulphur and other donor ligands

Abstract

The reaction of (η5-C5H5)Fe(dppe)I with the ligand L′ (L′ = S2(CH3)2, C6H5SNR2 (R = CH3, C6H11), S(NC4H8O)2, P(n-Bu)3, tetrahydrofuran and NC5H5 in the presence of T1PF6 have been investigated. Formation of the new cationic complexes [(η5-C5H5)Fe(dppe)L′]PF6 was found for all the ligands except for N,N′-thiobis-morpholine which was not coordinated. The THF complex [(η5-C5H5)Fe(dppe)(THF)]PF6 appears to be a useful precursor for the preparation of other cationic complexes. Electrochemical one electron oxidation of some of the cationic complexes suggests the formation of stable dicationic 17e-species. 1H-NMR and 31P-NMR data of the fragment (η5-C5H5)Fe(dppe)+ correlate with the π-acceptor capacity of the L′ ligand. © 1994.