Table 1.

Reductive peak potentials and diffusion coefficients (D) of 0.5 mM solutions of ${\text{FeL}}_2^{2+}$, ${\text{CoL}}_2^{2+}$, ${\text{NiL}}_2^{2+}$, and ${\text{ZnL}}_2^{2+}$ in DMF/0.1 M Bu₄NPF₆ under N₂.

Complex	Ep1, c	Ep2, c	Ep3, c	Ep4, c	D (cm2 s−1)
${\text{FeL}}_2^{2+}$	−1.43	−1.67	−2.31	–	4.69 × 10−6
${\text{CoL}}_2^{2+}$	−1.09	−1.77	−2.12	−2.65	1.02 × 10−6
${\text{NiL}}_2^{2+}$	−1.32	−1.51	−1.83	−2.25	4.36 × 10−6
${\text{ZnL}}_2^{2+}$	−1.61	−1.83	−2.24	−2.41	–

Glassy carbon working electrode, platinum wire counter electrode, and silver wire quasi-reference electrode.