Fig. 1. Cyclic voltammograms recorded at room temperature at 100 mV s⁻¹ for 1.0 mmol dm⁻³ MeCN solutions of mer- and fac-1²⁺–3²⁺ as their hexafluorophosphate salts. Solutions contained 0.2 mol dm⁻³ NBu₄PF₆ as supporting electrolyte. All potentials are shown against the Fc⁺/Fc couple (E_1/2 = 0 V).