Table 2.

Gibbs free energies of reaction (ΔG, kcal/mol), reorganization energies (λ, kcal/mol), reaction barriers (ΔG^≠, kcal/mol) and rate constants (k, M⁻¹s⁻¹) for the Cu(II) reduction by PhAs, O₂^•− and Asc⁻, at 298.15 K and pH = 7.4.

	∆G	λ	∆G≠	k
O2•−	−24.01	51.87	3.74	4.66 × 109
Asc−	−4.67	34.14	6.36	1.33 × 108
HnCOA	12.90	29.40	15.22	4.34 × 10−2
Hn−1COA–	5.49	30.79	10.69	8.59 × 104
Hn−2COA2–	−16.64	28.53	1.24	3.96 × 108
HnFLA	8.46	29.45	12.20	7.11 × 100
Hn−1FLA–	2.94	29.86	9.00	1.47 × 106
Hn−2FLA2–	−19.39	28.45	0.72	4.22 × 108
HnPRA	15.69	30.97	17.57	8.12 × 10−4
Hn−1PRA–	8.14	31.35	12.43	4.57 × 103
Hn−2PRA2–	−16.15	29.96	1.59	3.45 × 108
HnGAA	15.19	31.05	17.22	1.48 × 10−3
Hn−1GAA–	8.50	31.20	12.63	2.97 × 103
Hn−2GAA2–	−17.80	30.11	1.26	1.01 × 109