Table 4. Electrochemical potentials (V, versus ferrocene/ferrocenium ion couple) and HOMO–LUMO gaps (eV) measured in anhydrous CH₂Cl₂ with 0.1 M nBu₄NPF₆. Scan rate, 0.05 V s^–1; working electrode, glassy carbon; counter electrode, Pt wire; reference electrode, Ag/AgNO₃.

Compound	E ox (V)	E red (V)	ΔEHOMO–LUMO (eV)
6	0.21 a	–1.76	1.97
10Ni	0.16 a	–1.73	1.89
11	0.25 a	–1.66	1.91
12	0.26 a	–1.70	1.96
13	0.24 a	–1.67 a	1.91
14	0.52 a	–1.40	1.92
15	0.46 a	–1.37	1.83

^aIrreversible, determined by DPV.