... The second reduction wave (Eli2 = -2.48 V/Fc) is irreversible (both chemically and electrochemically) whereas the second oxidation at Ell2 = +0.42 V/Fc is an ... 257 from the Institute of Bioorganic Chemistry. ... 0002-7863/87/1509-3491$0l.50/0 0 1987 American Chemical Society ...