A. MCAULEY, LEE SPENCER, and P. R. WEST. Can. J . Chem. 63, 1198Chem. 63, (1985. The reactions of the outer-sphere electron transfer reagent, Ni(9-aneN&", (Dis(l,4,7-triazacyclononane)nickel(III) ion) with ascorbic acid, hydroquinone, catechol, and resorcinol have been investigated. The absence of any proton related equilibria with the oxidant provides a means of ascribing the observed inverse hydrogen ion dependences to reactions of the dissociated ascorbate or quinolate ions, (HA-). The data are consistent with the rate-determining one-electron transfer reactions: k, ~i ( 9 -a~~~~)~~' + HA-4 Ni(9-ane N-c)2" + HA followed by rapid oxidation of the radical ions formed. In the reaction with ascorbic acid, kl -0 and k 2 ( T = 25°C) = 5.2