Abstract
Investigations of the simultaneous reduction of cobalt(II) tetraphenylporphyrin and 4-nitrotoluene in DMF solutions by single and double potential step chronoamperometry as well as by linear sweep and cyclic voltammetry show that the diffusional pathways of the two reactants are coupled by the electron transfer reaction: [4-nitrotoluene] .−+Co IITPP → 4-nitrotoluene+Co 1TPP Experimental observation of the coupling is made possible by the fact that the diffusion coefficients of the two reactants differ substantially (by a factor of 3). Comparison with theoretical predictions indicates that the system behaves as if the coupling reaction was infinitely fast and irreversible from left to right.
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