PREPARATION OF NEW CATIONIC COMPLEXES [(ETA(5)-C5H5)FE(DPPE)L]PF6 WITH SULFUR AND OTHER DONOR LIGANDS

The reaction of (eta(5)-C5H5)Fe(dppe)I with the ligand L' (L' = S-2(CH3)(2), C(6)H(5)SNR(2) (R = CH3, C6H11), S(NC4H8O)(2), P(n-Bu)(3), tetrahydrofuran and NC5H5 in the presence of T1PF(6) have been investigated. Formation of the new cationic complexes [(eta(5)-C5H5)Fe(dppe)L']PF6 was found for all the ligands except for N,N'-thiobis-morpholine which was not coordinated. The THF complex [(eta(5)-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. H-1-NMR and P-31-NMR data of the fragment ([eta(5)-C5H5)Fe(dppe)(+) correlate with the pi-acceptor capacity of the L' ligand.