Entropy and enthalpy contributions to the kinetics of proton coupled electron transfer to the Mn4O4(O2PPh2)6 cubane
Literature Information
Thomas G. Carrell, Paul F. Smith, Joseph Dennes, G. Charles Dismukes
The dependence of rate, entropy of activation, and (1H/2H) kinetic isotope effect for H-atom transfer from a series of p-substituted phenols to cubane Mn4O4L6 (L = O2PPh2) (1) reveals the activation energy to form the transition state is proportional to the phenolic O–H bond dissociation energy. New implications for water oxidation and charge recombination in photosystem II are described.
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