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Electron-Transfer and Redox Reactivity of High-Valent Iron Imido and Oxo Complexes with the Formal Oxidation States of Five and Six
- Electron-Transfer and Redox Reactivity of High-Valent Iron Imido and Oxo Complexes with the Formal Oxidation States of Five and Six
- Lu, Xiaoyan; Li, Xiao-Xi; Lee, Yong-Min; Jang, Yuri; Seo, Mi Sook; Hong, Seungwoo; Cho, Kyung-Bin; Fukuzumi, Shunichi; Nam, Wonwoo
- Ewha Authors
- 남원우; 이용민; Shunichi Fukuzumi; 서미숙
- SCOPUS Author ID
- 남원우; Shunichi Fukuzumi; 서미숙
- Issue Date
- Journal Title
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY vol. 142, no. 8, pp. 3891 - 3904
- AMER CHEMICAL SOC
- SCI; SCIE; SCOPUS
- Document Type
- We report for the first time electron-transfer (ET) properties of mononuclear nonheme iron-oxo and -imido complexes with the formal oxidation states of five and six, such as an iron(V)-imido TAML cation radical complex, which is formally an iron(VI)-imido complex [Fe-V(NTs)(TAML(+center dot))] (1; NTs = tosylimido), an iron(V)-imido complex [Fe-V(NTs)(TAML)](-) (2), and an iron(V)-oxo complex [Fe-V(O)(TAML)](-) (3). The one-electron reduction potential (E-red vs SCE) of 1 was determined to be 0.86 V, which is much more positive than that of 2 (0.30 V), but the E-red of 3 is the most positive (1.04 V). The rate constants of ET of 1-3 were analyzed in light of the Marcus theory of adiabatic outer-sphere ET to determine the reorganization energies (lambda) of ET reactions with 1-3; the lambda of 1 (1.00 eV) is significantly smaller than those of 2 (1.98 eV) and 3 (2.25 eV) because of the ligand-centered ET reduction of 1 as compared to the metal-centered ET reduction of 2 and 3. In oxidation reactions, reactivities of 1-3 toward the nitrene transfer (NT) and oxygen atom transfer (OAT) to thioanisole and its derivatives and the C-H bond activation reactions, such as the hydrogen atom transfer (HAT) of 1,4-cyclohexadiene, were compared experimentally. The differences in the redox reactivity of 1-3 depending on the reaction types, such as NT and OAT versus HAT, were interpreted by performing density functional theory calculations, showing that the ligand-centered reduction seen on ET reactions can switch to metal-centered reduction in NT and HAT.
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