Proton-coupled electron transfer reactivities of electronically divergent heme superoxide intermediates: a kinetic, thermodynamic, and theoretical study.
Proton-coupled electron transfer reactivities of electronically divergent heme superoxide intermediates: a kinetic, thermodynamic, and theoretical study.
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电子发散血红素超氧化物中间体的质子耦合电子转移反应性:动力学、热力学和理论研究。
DOI:
10.1039/d1sc01952j
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发表时间:
2021-07-01
期刊:
影响因子:
8.4
通讯作者:
Wijeratne GB
中科院分区:
文献类型:
--
作者:
Mondal P;Ishigami I;Gérard EF;Lim C;Yeh SR;de Visser SP;Wijeratne GB
Heme superoxides are one of the most versatile metallo-intermediates in biology, and they mediate a vast variety of oxidation and oxygenation reactions involving O2(g). Overall proton-coupled electron transfer (PCET) processes they facilitate may proceed via several different mechanistic pathways, attributes of which are not yet fully understood. Herein we present a detailed investigation into concerted PCET events of a series of geometrically similar, but electronically disparate synthetic heme superoxide mimics, where unprecedented, PCET feasibility-determining electronic effects of the heme center have been identified. These electronic factors firmly modulate both thermodynamic and kinetic parameters that are central to PCET, as supported by our experimental and theoretical observations. Consistently, the most electron-deficient superoxide adduct shows the strongest driving force for PCET, whereas the most electron-rich system remains unreactive. The pivotal role of these findings in understanding significant heme systems in biology, as well as in alternative energy applications is also discussed. Electronic characteristics of heme significantly influence the feasibility of hydrogen atom abstraction by synthetic heme superoxide moieties, shedding new light on analogous scenarios implicated in both biological and alternate energy applications.
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影响因子:
14.8
作者:
通讯作者:
--
影响因子:
15
作者:
Chiang, Chien-Wei;Kleespies, Scott T.;Stout, Heather D.;Meier, Katlyn K.;Li, Po-Yi;Bominaar, Emile L.;Que, Lawrence, Jr.;Muenck, Eckard;Lee, Way-Zen
通讯作者:
Lee, Way-Zen
影响因子:
4.6
作者:
Corsi, DM;Murthy, NN;Karlin, KD
通讯作者:
Karlin, KD
影响因子:
15
作者:
CAPPELLANI, EP;DROUIN, SD;SCHWEITZER, CT
通讯作者:
SCHWEITZER, CT
影响因子:
4.6
作者:
Cummins DC;Alvarado JG;Zaragoza JPT;Effendy Mubarak MQ;Lin YT;de Visser SP;Goldberg DP
通讯作者:
Goldberg DP