Chronoamplometry, the study of the current semiintegral m(f) in the potential step experiment, is suggested as a method for investigating the rates and mechanisms of chemical reactions following electrode reactions. Working curves obtained through exact methods and through digital simulation are presented to assist in the determination of reaction mechanisms and in the evaluation of rate constants for the EC, ECE, and second-order dimerization mechanisms. Because of the constancy (or nearconstancy of m(f) at all points in the double potential step experiment, the uncertainty in the determination of m(t) is shown to be small with respect to that associated with the determination of either the current or the charge; thus, chronoamplometry is proposed to be superior to either chronoamperometry or chronocoulometry in the study of subtle variations necessary for the elucidation of reaction mechanisms.

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Table I. Electronic Absorption and 13C NMR Spectroscopic Data for cis-and trans-Rh(en),RJH,)(H,O),+ Emax, complex Amax, nm M-' cm-' 6 a rrans-Rh(en),(NH3)(H,0)"' 303 167 45.63 cis-Rh(en) , (NH 3)(H, 0)3 + 309 227 47.68, 46.39, Chemical shifts reported vs. Me,Si with dioxane (67.40 ppm) Reference 8. 45.99. 45.03bas an internal reference.(7) (a) Jakse, F. P.; Paukstelis, J. V.; Petersen.Relatively few bi-or polynuclear cyclopentadienylmetal nitrosyl compounds have been prepared.'S2 The known binuclear compounds include Cp2M2(N0), (Cp = v5-CSH5; M = Fe,3*4 CoSs6), which contain bridging nitrosyls, and Cp2Cr2(N0)47~8 and Cp2(~l-CSHS)Mn2(NO)3,g*10 which have 67426-08-8; Cp3Rh3(N0)', 75495-01-1; Cp,Rh,(NO)(NOJ, 75365-54-7; [Rh(CO),Cl],, 14523-22-9; CpRh(CO),, 12192-97-1; Cp3Rhg(CO)3, 12148-54-8.