Abstract
N- para-ferrocenyl benzoyl dipeptide esters 2– 5 were prepared by coupling para-ferrocenyl benzoic acid 1 to the dipeptide ethyl esters GlyGly(OEt) 2, GlyAla(OEt) 3, GlyLeu(OEt) 4 and GlyPhe(OEt) 5. The compounds were fully characterized by a range of NMR spectroscopic techniques, mass spectrometry (ESI-MS, FABMS, MS/MS) and cyclic voltammetry (CV). The a 1 and b 1 ions appeared at one mass unit less than the expected mass in the tandem mass spectra. The CV curves of compounds 2– 5 exhibited quasi-reversible redox behavior similar to the Fc/Fc + redox couple and displayed oxidation potential values in the 50–55 mV range, against the Fc/Fc + redox couple.
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