Table 2.

Summary of the Thermochemical Properties for the Two Catalysts

Thermochemical parameter	(bpy)Mn(CO)3H	(mesbpy)Mn(CO)3H
pKa (experimental)	28.8 (±0.8)	28.5 ± 0.9
apKa (extrapolated)	26.4 (±0.1)	28.0 (±0.2)
a$E_{\mathit{Mn}0}^o$	−1.48 (±0.01) V	−1.57 (±0.01) V
b$E_{\mathit{Mn}+}^o$	−1.48 (±0.01) V	−1.57 (±0.01) V
$\Delta G_{\mathrm{H}-}^{\mathrm{o}}(\text{experimental})$	50.7 (±1.1) kcal·mol−1	46.1 (±1.3) kcal·mol−1
d$\Delta G_{\mathrm{H}-}^{\mathrm{o}}(\text{extrapolated})$	47.5 (±0.4) kcal·mol−1	45.4 (±0.4) kcal·mol−1

^aFrom a plot of pK_a versus reduction potential; see SI and ref.⁵⁴

^bReduction potential of the corresponding Mn(0) species, (N^N)Mn(CO)₃, versus Fc^+/0.

^cReduction potential of the corresponding Mn(I) species, [(N^N)Mn(CO)₃]⁺, versus Fc^+/0.

^dUsing the extrapolated pK_a.