Abstract
The cyclic voltammetry of [Fe(terpy)2]2+ and [Ru(terpy)2]2+ and the frozen solution ESR spectra of the one-, two- and three-electron reduction products for both are reported. A total of four redox steps are resolved for both complexes. The first two are reversible one-electron processes, the third is a quasi-reversible one-electron process and the fourth step apparently involves an ECE mechanism. Only the one- and two-electron reduction products are chemically stable on a long time scale. However, the ESR spectra for all products can be described by an S=1/2 spin Hamiltonian. These results are interpreted to imply that the redox orbitals are single chelate ring types.
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