Entropy and enthalpy contributions to the kinetics of proton coupled electron transfer to the Mn4O4(O2PPh 2)6 cubane

Thomas G. Carrell; Paul F. Smith; Joseph Dennes; G. Charles Dismukes

doi:10.1039/c3cp55200d

Entropy and enthalpy contributions to the kinetics of proton coupled electron transfer to the Mn₄O₄(O₂PPh ₂)₆ cubane

Thomas G. Carrell, Paul F. Smith, Joseph Dennes, G. Charles Dismukes

Rutgers University

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	11843-11847
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	24
DOIs	https://doi.org/10.1039/c3cp55200d
Publication status	Published - Jun 28 2014

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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abstract = "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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