Events Calendar

3M University Lecturer in Chemistry 2017 ~ Prof. Jim Mayer

Monday, May 15, 2017
3:30 pm - 4:30 pm
3M Centre
Room: 3250

James M. Mayer
Charlotte Fitch Roberts Professor of Chemistry
Yale University
New Haven, CT

will present a talk entitled:

LECTURE 1 — Proton-Coupled Electron Transfer Reactions: from hydrogen atom transfer to separated e and H+

Abstract:       A wide range of chemical processes proceed by proton-coupled electron transfer (PCET), including combustion, fuel cells, the action of antioxidants, and catalysis by many metallo­enzymes. Understanding these processes is being developed through fundamental studies of single reaction steps that involve transfer of one proton and one electron. Some of these reactions ‘look like’ hydrogen atom transfers X–H + Y ® X + H–Y, while in other reactions the electron and proton are quite separated in the reactants or products. In the example below left, the hydroxylamine transfers a proton to a carboxylate concerted with transfer of an electron to an iron center 14 Å away. The example below right shows a reaction that cleaves a C–H bond by a PCET process, with the electron going to an external oxidant and the proton to a nearby carboxylate base. The rate constants for many of these reactions can be understood using models based on Marcus Theory. These studies indicate the factors that influence the facility of concerted proton/electron transfers, and show the commonality of organic and transition metal PCET reactions. These PCET concepts provide the basis for the development of new electrocatalysts for the reduction of oxygen.

Department of Chemistry
Johanna M. Blacquiere - Professor
Event Type:

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