Table 4. Cyclic Voltammetric Data^a for Complexes 1–8.

compound	oxidation peaks			reduction peaksb
1		1.90	2.40	−1.20
2	d			–0.79
3	1.8sh	1.90	2.28	–1.31
4	1.63c			–0.79
5	1.68c			–0.82
6	1.8sh	1.87		–0.80
7	1.8sh	1.91		–0.83
8	d			–2.25

^aPotential values in volts ± 0.02 vs SCE, in a 0.1–0.2 M [nBu₄N][BF₄]/CH₃CN solution, at a GC working electrode, determined by using the [Fe(η⁵-C₅H₅)₂]^0/+ redox couple (E_1/2^ox = 0.525 V vs SCE)^41,42 as internal standard at a scan rate of 100 mV s^–1; the values can be converted to the NHE reference by adding +0.245 V.

^bDetermined in the experiment with several cycles of potential.

^cIn comparison with the ferrocene these values are close.

^dNo clear oxidation wave was observed; sh = shoulder.