Ferrocene-modified oligopeptide as model compound for charge-transfer interactions with organic electron acceptors

Two newly synthesised 21 - amino acid peptides based on L-leucine and L-lysine substituted with ferrocene groups preserve the helical structure of the peptide and behave as multi-centre donor systems with six electroactive reversible redox centres per molecule. The formal potential of the hexaferrocene compound is slightly less positive than that of its single centre analogue. CT interactions of the ferrocene peptides with chloranil are not confirmed by UV-vis spectra.