Table 1.

One-Electron Oxidation Potentials (E_ox) of Electron Donors and Second-Order Rate Constants of Electron Transfer from Electron Donors to 1 and 2 in the Absence and Presence of Sc(OTf)₃ (10 mM) with Driving Force of Electron Transfer (–ΔG_et) in CF₃CH₂OH/CH₃CN (v/v = 1:1) at 273 K

		[(Bn-TPEN)MnIV(O)]2+a		[(N4Py)MnIV(O)]2+
electron donor	Eox, V vs SCEa	kobs, M−1 s−1	−ΔGet, eV	kobs, M−1 s−1	−ΔGet, eV
dimethylferrocene	0.26	(1.0 ± 0.1) × 105	0.52
ferrocene	0.37	(6.1 ± 0.3) × 103	0.41	(8.2 ± 0.1) × 103	0.43
bromoferrocene	0.54	(9.3 ± 0.1) × 102	0.24	(8.4 ± 0.3) × 102	0.26
acetylferrocene	0.62	(9.3 ± 0.2) × 10	0.16	(8.2 ± 0.2) × 10	0.18
dibromoferrocene	0.71	(3.1 ± 0.1) × 10	0.07	(4.3 ± 0.1) × 10	0.09
		[(Bn-TPEN)MnIV (O)]2+ – (Sc3+)2		[(N4Py)MnIV(O)]2+ – (Sc3+)2
electron donor	Eox, V vs SCEb	kobs, M−1 s−1	−ΔGet, eV	kobs, M−1 s−1	−ΔGet, eV
[FeII (Me2-phen)3]2+	0.94	(1.7 ± 0.2) × 105	0.42	(2.3 ± 0.1) × 105	0.48
[FeII (Ph2-phen)3]2+	1.02	(2.1 ± 0.1) × 104	0.34	(2.4 ± 0.4) × 104	0.40
[FeII (bpy)3]2+	1.06	(3.6 ± 0.1) × 103	0.30	(6.9 ± 0.1) × 103	0.36
[FeII (5-Cl-phen)3]2+	1.20	(4.1 ± 0.8) × 102	0.16	(4.1 ± 0.2) × 102	0.22
[RuII (bpy)3]2+	1.24	(7.3 ± 0.1) × 10	0.12	(6.4 ± 0.3) × 10	0.18

^aTaken from ref 41b.

^bTaken from ref 30b.