Table 2.

Electrochemical parameters of non-chloride and chloride naphthoquinone with tyrosine, valine and tryptophan substituents ^a.

Compound	Epa	Epc	ΔEp b	E1/2 c	ipa	ipc	|ipa/ipc|
	(V)	(V)	(V)	(V)	(mA cm−2)
3a	−1.15	−1.27	0.13	−1.21	0.28	−0.30	0.95
3b	−1.16	−1.27	0.12	−1.21	0.28	−0.30	0.95
3c	−1.19	−1.30	0.11	−1.24	0.26	−0.27	0.95
4a	−1.04	−1.15	0.11	−1.10	0.22	−0.24	0.92
4b	−1.05	−1.19	0.14	−1.12	0.21	−0.25	0.83
4c	−1.05	−1.17	0.12	−1.11	0.23	−0.27	0.85

^a Determined by cyclic voltammetry in TBABF₄ 0.1 M/DMSO at 100 mV/s. The potentials are given with respect to the Ag/Ag⁺ pseudo-reference electrode; ^b ΔE_p = E_pc − E_pa; ^c E_1/2 = (E_pa + E_pc)/2.