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Mechanistic Insight into Peroxydisulfate Reactivity: Oxidation of the cis,cis-[Ru(bpy)₂(OH₂)]₂O⁴⁺ "Blue Dimer"

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  • One-electron oxidation of the μ-oxo dimer (cis,cis-[Ruᴵᴵᴵ(bpy)₂(OH₂)]₂O⁴⁺, {3,3}) to {3,4} by S₂O₈²⁻ can be described by three concurrent reaction pathways corresponding to the three protic forms of {3,3}. Free energy correlations of the rate constants, transient species dynamics determined by pulse radiolysis, and medium and temperature dependencies of the alkaline pathway all suggest that the ratedetermining step in these reactions is a strongly nonadiabatic dissociative electron transfer within a precursor ion pair leading to the {3,4}|SO₄²⁻|SO₄•− ion triple. As deduced from the SO₄•− scavenging experiments with 2-propanol, the SO₄•− radical then either oxidizes {3,4} to {4,4} within the ion triple, effecting a net two-electron oxidation of {3,3}, or escapes in solution with ∼25% probability to react with additional {3,3} and {3,4}, that is, effecting sequential one-electron oxidations. The reaction model presented also invokes rapid {3,3} + {4,4} → 2{3,4} comproportionation, for which kcₒₘ ∼5 × 10⁷ M⁻¹ s⁻¹ was independently measured. The model provides an explanation for the observation that, despite favorable energetics, no oxidation beyond the {3,4} state was detected. The indiscriminate nature of oxidation by SO₄•− indicates that its fate must be quantitatively determined when using S₂O₈²⁻ as an oxidant.
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  • Hurst, J. K., Roemeling, M. D., & Lymar, S. V. (2015). Mechanistic Insight into Peroxydisulfate Reactivity: Oxidation of the cis, cis-[Ru (bpy)₂(OH₂)]₂O⁴˖“Blue Dimer”. The Journal of Physical Chemistry B, 119(24), 7749-7760. doi:10.1021/acs.jpcb.5b00922
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  • 119
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  • 24
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  • The published article is copyrighted by American Chemical Society
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  • This work and use of the 2 MeV electron Van de Graaff and LEAF Facility of the Brookhaven National Laboratory (BNL) Accelerator Center for Energy Research was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences, under contracts DE-AC02-98CH10886 and DE-SC0012704 (at BNL) and through grant DE-FG02-06ER15820 (to Washington State University). M.D.R. received scholastic support from HHMI grant 52005883 (administered by Oregon State University).
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