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Given the slope and the intercept of the line of Figure 4 and the quenching rate data of Table V, the "E(*Cr(NN)33+/Cr(NN)32+) reduction potentials are estimated to be 1.4 V for both diphenyl substituted bpy and phen complexes; the corresponding ground-state reduction potentials are -0.28 V.(64) J. Silverman and R. W. Dodson, J. Phys. Chem., 56, 846 (1952). ( 65) The self-exchange rate constant of 4.0 X 107 M~1 s-1 for (2E)Cr-(NN)33+-Cr(NN)32•, together with the Iquenching rate data of Table V, gives ~4 X 10™ M-1 s-1 (slope 0.41, intercept 9,1) as an estimate of the exchange rate constant for the reaction I• + -* + I•. (66) G. J. Ferraudi and J. F. Endicott, private communication of unpublished results. (67)

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