Table 2.

Dependence of the Calculated (Calc.) and Experimentally Measured (Exptl.) ET and PCET Rate Constants on the Calculated ${\overline{R}}_{\text{ET}}$.^a

Proton acceptor	Δ(QRuQPA) (e2)	pKa of proton acceptor	Calc. |slope| (Å−1)	Exptl. |slope| (Å−1)
		ET reaction
N/A	0	N/A	1.37	1.34b
		PCET reaction
[HPO4]2−	4	7.20c	0.59	0.59d
Imidazole	2	6.95e	0.95	0.87f

^aThe calculated (experimental) magnitudes of the slopes are obtained from the calculated (experimental) ln(k) versus the calculated ${\overline{R}}_{\text{ET}}$ values from Table 1.

^bValue for ET in Ru/Ru system (Fig. 1A) determined by plotting the experimental rate constants from Ref. ¹³ as a function of the calculated ${\overline{R}}_{\text{ET}}$ values.

^cValue from Ref. ⁷².

^dValue for Ru/Tyr system (Fig. 1B) with phosphate as proton acceptor determined by plotting the experimental rate constants from Ref. ⁵⁰ as a function of the calculated ${\overline{R}}_{\text{ET}}$ values.

^eValue from Ref. ⁷³.

^fValue for Ru/Tyr system with imidazole as proton acceptor determined by plotting the experimental rate constants measured herein as a function of the calculated ${\overline{R}}_{\text{ET}}$ values.