Improved electrochemistry of multi-ferrocenyl compounds: investigation of biferrocene, terferrocene, bis(fulvalene)diiron and diferrocenylethane in dichloromethane using [NBu4][B(C6F5)4] as supporting electrolyte

Cyclic voltammetry in CH2Cl2 containing 0.1 M [NBu4][B(C6F5)4] gives enhanced behavior for the oxidation of complexes containing two or more ferrocenyl groups, owing to better stabilities and solubilities of the multiply-charged oxidation products. The lower ion-pairing interaction of the anion [B(C6F5)4]− with oligoferrocenyl multiply-charged cations leads to larger separations of the oxidation waves which may be exploited in studies of mixed-valent systems.