Abstract
The electrochemical oxidation of Rh 2(hp) 4, Rh 2(chp) 4 and Rh 2(mhp) 4 has been examined by cyclic, alternating current and stirred voltammetry in nine non-aqueous solvents. The oxidation potentials depend upon the identity of the solvent, and become more cathodic as the donor power of the solvent is increased. In any given solvent an apparent correlation exists between the three oxidation potentials and the Taft resonance parameter for the variously substituted pyridyl rings. The stable one-electron oxidation products have been characterised spectroelectrochemically in CH 3CN. The electro-generated monocations exhibit characteristic intervalence charge-transfer bands in the near infrared portion of their electronic spectra.
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