Abstract
N-Methylnicotinamide (MNA) was studied by dc and DP polarography and linear sweep cyclic voltammetry in acidic media (pH < 3). Tafel slopes and reaction orders were obtained from i — E curves traced at potentials corresponding to the foot of the polarographic wave. The results show that in the pH range studied the species in solution is the non-protonated one. In a strong acidic medium the overall process is irreversible. The reduction pathway consists of the reversible transfer of one electron and two H + ions followed by an irreversible one-electron transfer, which is the rate-determining step. At 1 < pH < 3, this process is in competition with the electrodimerization of MNA.
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