Electrochemistry of Cycloaddition Products of Olefins with Nickel Dithiolenes: A Reinvestigation of the Reduction of the 1:1 Adduct between Ni(S2C2(CF3)2)2 and Norbornadiene

The reduction of Ni(S2C2(CF3)2)2(C7H8) (3) proceeds by an overall two-electron irreversible process through an ECE mechanism. The reduction potential of 3 is about 700 mV negative of that in an earlier report, which is shown to result from contamination of the sample by the monoanion of the olefin-free complex [Ni(S2C2(CF3)2)2]-.