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  • cPCET versus HAT: A Direct ...
    Klein, Johannes E. M. N.; Knizia, Gerald

    Angewandte Chemie (International ed.), September 10, 2018, Letnik: 57, Številka: 37
    Journal Article

    Proton‐coupled electron transfer (PCET) events play a key role in countless chemical transformations, but they come in many physical variants which are hard to distinguish experimentally. While present theoretical approaches to treat these events are mostly based on physical rate coefficient models of various complexity, it is now argued that it is both feasible and fruitful to directly analyze the electronic N‐electron wavefunctions of these processes along their intrinsic reaction coordinate (IRC). In particular, for model systems of lipoxygenase and the high‐valent oxoiron(IV) intermediate TauD‐J it is shown that by invoking the intrinsic bond orbital (IBO) representation of the wavefunction, the common boundary cases of hydrogen atom transfer (HAT) and concerted PCET (cPCET) can be directly and unambiguously distinguished in a straightforward manner. Proton‐coupled electron transfer (PCET) events are pivotal in many transformations, but variants are hard to distinguish. The boundary cases of hydrogen atom transfer (HAT) and concerted PCET (cPCET) could now be clearly identified in enzyme model complexes via theory. Key to this was an intrinsic bond orbital analysis of the PCET process along its intrinsic reaction coordinate.