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Issue 37, 2016

Direct simulation of electron transfer in the cobalt hexammine(ii/iii) self-exchange reaction

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Abstract

We present an atomistic simulation of the cobalt hexammine(II/III) self-exchange reaction using path integral (PI) methods. We construct a simple force field for the system in its reactant state that includes parameters for both atom–atom interactions, and interactions with an explicit transferring electron represented in the PI framework. We then calculate the outer sphere free energy barrier due to solvent reorganization from a PI molecular dynamics simulation and we obtain the dynamic transmission coefficient using ring polymer molecular dynamics. Combining these calculated values with literature values for the inner sphere reorganization energy, we obtain a reaction rate in good agreement with experimental measurements. The protocol introduced here circumvents the need for complex, system-specific force field parameterization along an assumed reaction coordinate making it sufficiently accurate, efficient, and broadly applicable to the study of both adiabatic and nonadiabatic charge transfer reactions in transition metal complexes.

Graphical abstract: Direct simulation of electron transfer in the cobalt hexammine(ii/iii) self-exchange reaction

Supplementary files

Article information


Submitted
13 Jul 2016
Accepted
31 Aug 2016
First published
31 Aug 2016

Phys. Chem. Chem. Phys., 2016,18, 26117-26124
Article type
Paper

Direct simulation of electron transfer in the cobalt hexammine(II/III) self-exchange reaction

R. L. Kenion and N. Ananth, Phys. Chem. Chem. Phys., 2016, 18, 26117 DOI: 10.1039/C6CP04882J

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