Table 2. Cyclic voltammetry results (V vs. Fc⁺/Fc) for Co and Zn complexes in acetonitrile/0.1 M Bu₄NPF₆ .

Complex	E 1/2 (CoIII/II)	E p1,c	E p2,c	E p3,c
1-Co, [(ax-PY4PZMe2)Co(OH2)]2+	0.32	–1.22	–1.40	—
1-Zn, [(ax-PY4PZMe2)Zn(OH2)]2+	—	—	–1.69	–1.90
2-Co, [(eq-PY4PZMe2)Co(OH2)]2+	0.27	–1.30	–1.42	–2.04
2-Zn, [(eq-PY4PZMe2)Zn(OH2)]2+	—	—	–1.70	–1.83
3-Co, [(PY3PZ2Me2)Co(OH2)]2+	0.35	–1.18	–1.25	–1.95
3-Zn, [(PY3PZ2Me2)Zn(OH2)]2+	—	—	–1.45	–1.75
[(PY5Me2)Co(CH3CN)]2+ (ref. 10a )	0.24	–1.47	–2.36	—
[(PY5Me2)Zn(OH2)]2+  a	—	—	—	—

^aElectrochemistry in CH₃CN was performed to confirm its electrochemical silence as previously reported in CH₂Cl₂ solution (ref. 10a ).