Table 2.

Summary of electrochemical results for 1 – 5.^a

Complex	E1/2(III/II) (ΔE) in dry CH3CNb (V)	Ep,c observed in dry CH3CNc (V)	E1/2(IV/III) in CH3CN with 0.1 M waterd (V)
1	0.61 (0.08)	−0.53	0.90
2	0.69 (0.08)	−0.43	1.07
3	0.55 (0.07)	−0.58	0.83
4	0.72 (0.11)	−0.48	0.98e
5	0.77 (0.14)	−0.32	1.23

^aAll potentials are referred to Fc^+/0;

^bobtained by cyclic voltammetry with a scan rate = 0.1 V s⁻¹ for 1 mM solutions of 1a – 5a;

^cobtained by cyclic voltammetry with a scan rate = 0.1 V s⁻¹ for 1 mM solutions of 1 – 5;

^dobtained by spectropotentiometry.

^eestimated based on the correlation shown in Figure 4.