Table 1. Redox Potentials (V vs Fc⁺/Fc) and Electrochemical Gaps (ΔE_gap,ec) of TbNC@C₈₂ (C₂(5), C_s(6), C_2v(9))^a.

	E1/2 (V vs Fc/Fc+)
	reduction steps (Ered)				oxidation step (Eox)
sample	first	second	third	fourth	first	ΔEgap,EC/Vb	ref.
TbNC@C2(5)-C82	−0.88	−0.97	−1.55	−1.91	0.50	1.38	36
Yb@C2(5)-C82	−0.86	−0.98	−1.50	−1.87	0.38	1.24	49
TbNC@Cs(6)-C82	−0.59	−0.84	−1.77	−1.92	0.55	1.14	this work
YNC@Cs(6)-C82	−0.59	−0.84	−1.76	−1.92	0.56	1.15	35
Yb@Cs(6)-C82	−0.62	−0.92	−1.81	−2.01	0.34	0.96	49
TbNC@C2v(9)-C82	−0.46	−0.81	−1.78	−1.96	0.55	1.07	this work
Yb@C2v(9)-C82	−0.46	−0.78	−1.60	−1.90	0.61	1.07	49

^aOther reported C₈₂-based endohedral fullerenes were also added for comparison.

^bΔE_gap,EC = E_1/2,ox(1) – E_1/2,red(1).