New proton and electron donors, M-II(HL)(2) (M = Ni, Pd, Pt; L = 5,6-diethylpyradzinedithiolate), as well as a proton and electron acceptor, Pt-IV(L)(2), were prepared and characterized. The pH-dependent cyclic voltammetry of the M-II(HL)(2) complexes revealed a favorable Gibbs free energy (K-com > 1) for the proton and electron transfer reactions from M-II(HL)(2) to M-IV(L)(2); i.e., the equilibrium for the following reaction lies to the right: M-II(HL)(2) + M-IV(L)(2) reversible arrow 2M(III)-(HL)(L).