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Draksharapu A, Xu S, Que L. Ce IV - and HClO 4 -Promoted Assembly of an Fe 2IV (μ-O) 2 Diamond Core from its Monomeric Fe IV =O Precursor at Room Temperature. Angew Chem Int Ed Engl 2020; 59:22484-22488. [PMID: 32902902 PMCID: PMC7708462 DOI: 10.1002/anie.202010027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Indexed: 11/06/2022]
Abstract
Diiron(IV)-oxo species are proposed to effect the cleavage of strong C-H bonds by nonheme diiron enzymes such as soluble methane monooxygenase (sMMO) and fatty acid desaturases. However, synthetic mimics of such diiron(IV) oxidants are rare. Herein we report the reaction of (TPA*)FeII (1) (TPA*=tris(3,5-dimethyl-4-methoxypyridyl-2-methyl)amine) in CH3 CN with 4 equiv CAN and 200 equiv HClO4 at 20 °C to form a complex with an [FeIV2 (μ-O)2 ]4+ core. CAN and HClO4 play essential roles in this unprecedented transformation, in which the comproportionation of FeIII -O-CeIV and FeIV =O/Ce4+ species is proposed to be involved in the assembly of the [FeIV2 (μ-O)2 ]4+ core.
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Affiliation(s)
- Apparao Draksharapu
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota, 55455, USA
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Shuangning Xu
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota, 55455, USA
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota, 55455, USA
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Draksharapu A, Xu S, Que L. Ce
IV
‐ and HClO
4
‐Promoted Assembly of an Fe
2
IV
(μ‐O)
2
Diamond Core from its Monomeric Fe
IV
=O Precursor at Room Temperature. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Apparao Draksharapu
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis Minnesota 55455 USA
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
| | - Shuangning Xu
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis Minnesota 55455 USA
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis Minnesota 55455 USA
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3
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Ezhov R, Ravari AK, Pushkar Y. Characterization of the Fe
V
=O Complex in the Pathway of Water Oxidation. Angew Chem Int Ed Engl 2020; 59:13502-13505. [PMID: 32369663 DOI: 10.1002/anie.202003278] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/15/2020] [Indexed: 02/02/2023]
Affiliation(s)
- Roman Ezhov
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
| | - Alireza Karbakhsh Ravari
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
| | - Yulia Pushkar
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
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Ezhov R, Ravari AK, Pushkar Y. Characterization of the Fe
V
=O Complex in the Pathway of Water Oxidation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003278] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Roman Ezhov
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
| | - Alireza Karbakhsh Ravari
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
| | - Yulia Pushkar
- Department of Physics and Astronomy Purdue University 525 Northwestern avenue West Lafayette IN 47906 USA
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Karmalkar DG, Sankaralingam M, Seo MS, Ezhov R, Lee YM, Pushkar YN, Kim WS, Fukuzumi S, Nam W. A High-Valent Manganese(IV)-Oxo-Cerium(IV) Complex and Its Enhanced Oxidizing Reactivity. Angew Chem Int Ed Engl 2019; 58:16124-16129. [PMID: 31489757 DOI: 10.1002/anie.201910032] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Indexed: 12/20/2022]
Abstract
A mononuclear nonheme manganese(IV)-oxo complex binding the Ce4+ ion, [(dpaq)MnIV (O)]+ -Ce4+ (1-Ce4+ ), was synthesized by reacting [(dpaq)MnIII (OH)]+ (2) with cerium ammonium nitrate (CAN). 1-Ce4+ was characterized using various spectroscopic techniques, such as UV/Vis, EPR, CSI-MS, resonance Raman, XANES, and EXAFS, showing an Mn-O bond distance of 1.69 Å with a resonance Raman band at 675 cm-1 . Electron-transfer and oxygen atom transfer reactivities of 1-Ce4+ were found to be greater than those of MnIV (O) intermediates binding redox-inactive metal ions (1-Mn+ ). This study reports the first example of a redox-active Ce4+ ion-bound MnIV -oxo complex and its spectroscopic characterization and chemical properties.
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Affiliation(s)
- Deepika G Karmalkar
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | | | - Mi Sook Seo
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Roman Ezhov
- Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave., West Lafayette, IN, 47907, USA
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Yulia N Pushkar
- Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave., West Lafayette, IN, 47907, USA
| | - Won-Suk Kim
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea.,Faculty of Science and Engineering, Meijo University, Nagoya, Aichi, 468-0073, Japan
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 03760, Korea.,School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
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Karmalkar DG, Sankaralingam M, Seo MS, Ezhov R, Lee Y, Pushkar YN, Kim W, Fukuzumi S, Nam W. A High‐Valent Manganese(IV)–Oxo–Cerium(IV) Complex and Its Enhanced Oxidizing Reactivity. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201910032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Deepika G. Karmalkar
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | | | - Mi Sook Seo
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | - Roman Ezhov
- Department of Physics and Astronomy Purdue University 525 Northwestern Ave. West Lafayette IN 47907 USA
| | - Yong‐Min Lee
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | - Yulia N. Pushkar
- Department of Physics and Astronomy Purdue University 525 Northwestern Ave. West Lafayette IN 47907 USA
| | - Won‐Suk Kim
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
- Faculty of Science and Engineering Meijo University Nagoya Aichi 468-0073 Japan
| | - Wonwoo Nam
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
- School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710119 China
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Rasheed W, Draksharapu A, Banerjee S, Young VG, Fan R, Guo Y, Ozerov M, Nehrkorn J, Krzystek J, Telser J, Que L. Crystallographic Evidence for a Sterically Induced Ferryl Tilt in a Non‐Heme Oxoiron(IV) Complex that Makes it a Better Oxidant. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804836] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Waqas Rasheed
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis MN 55455 USA
| | - Apparao Draksharapu
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis MN 55455 USA
| | - Saikat Banerjee
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis MN 55455 USA
| | - Victor G. Young
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis MN 55455 USA
| | - Ruixi Fan
- Department of Chemistry Carnegie Mellon University Pittsburgh PA 15213 USA
| | - Yisong Guo
- Department of Chemistry Carnegie Mellon University Pittsburgh PA 15213 USA
| | - M. Ozerov
- National High Magnetic Field Laboratory (NHMFL) Florida State University Tallahassee FL 32310 USA
| | - Joscha Nehrkorn
- National High Magnetic Field Laboratory (NHMFL) Florida State University Tallahassee FL 32310 USA
| | - J. Krzystek
- National High Magnetic Field Laboratory (NHMFL) Florida State University Tallahassee FL 32310 USA
| | - Joshua Telser
- Department of Biological Chemical and Physical Sciences Roosevelt University Chicago IL 60605 USA
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis University of Minnesota Minneapolis MN 55455 USA
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Rasheed W, Draksharapu A, Banerjee S, Young VG, Fan R, Guo Y, Ozerov M, Nehrkorn J, Krzystek J, Telser J, Que L. Crystallographic Evidence for a Sterically Induced Ferryl Tilt in a Non-Heme Oxoiron(IV) Complex that Makes it a Better Oxidant. Angew Chem Int Ed Engl 2018; 57:9387-9391. [PMID: 29882390 DOI: 10.1002/anie.201804836] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Indexed: 11/06/2022]
Abstract
Oxoiron(IV) units are often implicated as intermediates in the catalytic cycles of non-heme iron oxygenases and oxidases. The most reactive synthetic analogues of these intermediates are supported by tetradentate tripodal ligands with N-methylbenzimidazole or quinoline donors, but their instability precludes structural characterization. Herein we report crystal structures of two [FeIV (O)(L)]2+ complexes supported by pentadentate ligands incorporating these heterocycles, which show longer average Fe-N distances than the complex with only pyridine donors. These longer distances correlate linearly with log k2 ' values for O- and H-atom transfer rates, suggesting that weakening the ligand field increases the electrophilicity of the Fe=O center. The sterically bulkier quinoline donors are also found to tilt the Fe=O unit away from a linear N-Fe=O arrangement by 10°.
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Affiliation(s)
- Waqas Rasheed
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Apparao Draksharapu
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Saikat Banerjee
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Victor G Young
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Ruixi Fan
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
| | - M Ozerov
- National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, FL, 32310, USA
| | - Joscha Nehrkorn
- National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, FL, 32310, USA
| | - J Krzystek
- National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, FL, 32310, USA
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, IL, 60605, USA
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, MN, 55455, USA
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