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Raje S, Mani K, Kandasamy P, Butcher RJ, Angamuthu R. Bioinspired Oxidative Cleavage of Aliphatic C–C Bonds Utilizing Aerial Oxygen by Nickel Acireductone Dioxygenase Mimics. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sakthi Raje
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Kalaikodikumaran Mani
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Parameswaran Kandasamy
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Ray J. Butcher
- Department of Chemistry Howard University 20059 Washington, D.C. United States
| | - Raja Angamuthu
- Laboratory of Inorganic Synthesis and Bioinspired Catalysis (LISBIC) Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
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Oxygen activation by mononuclear Mn, Co, and Ni centers in biology and synthetic complexes. J Biol Inorg Chem 2016; 22:407-424. [PMID: 27853875 DOI: 10.1007/s00775-016-1402-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 10/21/2016] [Indexed: 10/20/2022]
Abstract
The active sites of metalloenzymes that catalyze O2-dependent reactions generally contain iron or copper ions. However, several enzymes are capable of activating O2 at manganese or nickel centers instead, and a handful of dioxygenases exhibit activity when substituted with cobalt. This minireview summarizes the catalytic properties of oxygenases and oxidases with mononuclear Mn, Co, or Ni active sites, including oxalate-degrading oxidases, catechol dioxygenases, and quercetin dioxygenase. In addition, recent developments in the O2 reactivity of synthetic Mn, Co, or Ni complexes are described, with an emphasis on the nature of reactive intermediates featuring superoxo-, peroxo-, or oxo-ligands. Collectively, the biochemical and synthetic studies discussed herein reveal the possibilities and limitations of O2 activation at these three "overlooked" metals.
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Elton ES, Zhang T, Prabhakar R, Arif AM, Berreau LM. Pb(II)-Promoted Amide Cleavage: Mechanistic Comparison to a Zn(II) Analogue. Inorg Chem 2013; 52:11480-92. [DOI: 10.1021/ic401782x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Eric S. Elton
- Department
of Chemistry and Biochemistry, Utah State University, 0300 Old
Main Hill, Logan, Utah 84322-0300, United States
| | - Tingting Zhang
- Department
of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431, United States
| | - Rajeev Prabhakar
- Department
of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431, United States
| | - Atta M. Arif
- Department
of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112-0850, United States
| | - Lisa M. Berreau
- Department
of Chemistry and Biochemistry, Utah State University, 0300 Old
Main Hill, Logan, Utah 84322-0300, United States
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Ward AL, Elbaz L, Kerr JB, Arnold J. Nonprecious metal catalysts for fuel cell applications: electrochemical dioxygen activation by a series of first row transition metal tris(2-pyridylmethyl)amine complexes. Inorg Chem 2012; 51:4694-706. [PMID: 22458367 DOI: 10.1021/ic2026957] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A series of divalent first row triflate complexes supported by the ligand tris(2-pyridylmethyl)amine (TPA) have been investigated as oxygen reduction catalysts for fuel cell applications. [(TPA)M(2+)](n+) (M = Mn, Fe, Co, Ni, and Cu) derivatives were synthesized and characterized by X-ray crystallography, cyclic voltammetry, NMR spectroscopy, magnetic susceptibility, IR spectroscopy, and conductance measurements. The stoichiometric and electrochemical O(2) reactivities of the series were examined. Rotating-ring disk electrode (RRDE) voltammetry was used to examine the catalytic activity of the complexes on a carbon support in acidic media, emulating fuel cell performance. The iron complex displayed a selectivity of 89% for four-electron conversion and demonstrated the fastest reaction kinetics, as determined by a kinetic current of 7.6 mA. Additionally, the Mn, Co, and Cu complexes all showed selective four-electron oxygen reduction (<28% H(2)O(2)) at onset potentials (~0.44 V vs RHE) comparable to state of the art molecular catalysts, while being straightforward to access synthetically and derived from nonprecious metals.
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Affiliation(s)
- Ashleigh L Ward
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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Ng GKY, Ziller JW, Borovik AS. Preparation and structures of dinuclear complexes containing M(II)-OH centers. Chem Commun (Camb) 2012; 48:2546-8. [PMID: 22288074 PMCID: PMC3777269 DOI: 10.1039/c2cc16277f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The synthesis of M(II)(2) complexes (M(II)=Co, Mn) with terminal hydroxo ligands has been achieved utilizing a dinucleating ligand containing a bridging pyrazolate unit and appended (neopentyl)aminopyridyl groups. Structural studies on the complexes revealed that the M(II)-OH units are positioned in a syn-configuration, placing the hydroxo ligands in close proximity (ca. 3 Å apart), which may be a prerequisite for water oxidation.
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Affiliation(s)
- Gary K.-Y. Ng
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697, USA
| | - Joseph W. Ziller
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697, USA
| | - A. S. Borovik
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697, USA
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Huang L, Cheng K, Yao B, Xie Y, Zhang Y. Iron-Promoted C–C Bond Cleavage of 1,3-Diketones: A Route to 1,2-Diketones under Mild Reaction Conditions. J Org Chem 2011; 76:5732-7. [DOI: 10.1021/jo200840y] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Lehao Huang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Kai Cheng
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Bangben Yao
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Yongju Xie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Yuhong Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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Shook RL, Peterson SM, Greaves J, Moore C, Rheingold AL, Borovik A. Catalytic reduction of dioxygen to water with a monomeric manganese complex at room temperature. J Am Chem Soc 2011; 133:5810-7. [PMID: 21425844 PMCID: PMC3381988 DOI: 10.1021/ja106564a] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
There have been numerous efforts to incorporate dioxygen into chemical processes because of its economic and environmental benefits. The conversion of dioxygen to water is one such example, having importance in both biology and fuel cell technology. Metals or metal complexes are usually necessary to promote this type of reaction and several systems have been reported. However, mechanistic insights into this conversion are still lacking, especially the detection of intermediates. Reported herein is the first example of a monomeric manganese(II) complex that can catalytically convert dioxygen to water. The complex contains a tripodal ligand with two urea groups and one carboxyamidopyridyl unit; this ligand creates an intramolecular hydrogen-bonding network within the secondary coordination sphere that aids in the observed chemistry. The manganese(II) complex is five-coordinate with an N(4)O primary coordination sphere; the oxygen donor comes from the deprotonated carboxyamido moiety. Two key intermediates were detected and characterized: a peroxo-manganese(III) species and a hybrid oxo/hydroxo-manganese(III) species (1). The formulation of 1 was based on spectroscopic and analytical data, including an X-ray diffraction analysis. Reactivity studies showed dioxygen was catalytically converted to water in the presence of reductants, such as diphenylhydrazine and hydrazine. Water was confirmed as a product in greater than 90% yield. A mechanism was proposed that is consistent with the spectroscopy and product distribution, in which the carboxyamido group switches between a coordinated ligand and a basic site to scavenge protons produced during the catalytic cycle. These results highlight the importance of incorporating intramolecular functional groups within the secondary coordination sphere of metal-containing catalysts.
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Affiliation(s)
- Ryan L. Shook
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697-2025
| | - Sonja M. Peterson
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697-2025
| | - John Greaves
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697-2025
| | - Curtis Moore
- Department of Chemistry and Biochemistry, University of California-San Diego, San Diego, 92093-0332
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California-San Diego, San Diego, 92093-0332
| | - A.S. Borovik
- Department of Chemistry, University of California-Irvine, 1102 Natural Science II, Irvine, CA 92697-2025
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Berreau LM, Borowski T, Grubel K, Allpress CJ, Wikstrom JP, Germain ME, Rybak-Akimova EV, Tierney DL. Mechanistic studies of the O2-dependent aliphatic carbon-carbon bond cleavage reaction of a nickel enolate complex. Inorg Chem 2011; 50:1047-57. [PMID: 21222442 DOI: 10.1021/ic1017888] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mononuclear nickel(II) enolate complex [(6-Ph(2)TPA)Ni(PhC(O)C(OH)C(O)Ph]ClO(4) (I) was the first reactive model complex for the enzyme/substrate (ES) adduct in nickel(II)-containing acireductone dioxygenases (ARDs) to be reported. In this contribution, the mechanism of its O(2)-dependent aliphatic carbon-carbon bond cleavage reactivity was further investigated. Stopped-flow kinetic studies revealed that the reaction of I with O(2) is second-order overall and is ∼80 times slower at 25 °C than the reaction involving the enolate salt [Me(4)N][PhC(O)C(OH)C(O)Ph]. Computational studies of the reaction of the anion [PhC(O)C(OH)C(O)Ph](-) with O(2) support a hydroperoxide mechanism wherein the first step is a redox process that results in the formation of 1,3-diphenylpropanetrione and HOO(-). Independent experiments indicate that the reaction between 1,3-diphenylpropanetrione and HOO(-) results in oxidative aliphatic carbon-carbon bond cleavage and the formation of benzoic acid, benzoate, and CO:CO(2) (∼12:1). Experiments in the presence of a nickel(II) complex gave a similar product distribution, albeit benzil [PhC(O)C(O)Ph] is also formed, and the CO:CO(2) ratio is ∼1.5:1. The results for the nickel(II)-containing reaction match those found for the reaction of I with O(2) and provide support for a trione/HOO(-) pathway for aliphatic carbon-carbon bond cleavage. Overall, I is a reasonable structural model for the ES adduct formed in the active site of Ni(II)ARD. However, the presence of phenyl appendages at both C(1) and C(3) in the [PhC(O)C(OH)C(O)Ph](-) anion results in a reaction pathway for O(2)-dependent aliphatic carbon-carbon bond cleavage (via a trione intermediate) that differs from that accessible to C(1)-H acireductone species. This study, as the first detailed investigation of the O(2) reactivity of a nickel(II) enolate complex of relevance to Ni(II)ARD, provides insight toward understanding the chemical factors involved in the O(2) reactivity of metal acireductone species.
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Affiliation(s)
- Lisa M Berreau
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA.
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Grubel K, Ingle GK, Fuller AL, Arif AM, Berreau LM. Influence of water on the formation of O2-reactive divalent metal enolate complexes of relevance to acireductone dioxygenases. Dalton Trans 2011; 40:10609-20. [DOI: 10.1039/c1dt10587f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Powell-Jia DA, Pham MTN, Ziller JW, Borovik AS. Nickel(II) complexes stabilized by bis[N-(6-pivalamido-2-pyridylmethyl)]benzylamine: Synthesis and characterization of complexes stabilized by a hydrogen bonding network. Inorganica Chim Acta 2010; 363:2728-2733. [PMID: 22745511 PMCID: PMC3382998 DOI: 10.1016/j.ica.2010.05.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrogen bonds in metalloproteins are key in directing reactivity yet to be achieved in synthetic systems. We have been developing a synthetic system that uses hydrogen-bonding interactions to modulate the secondary coordination around a transition metal ion. This was accomplished with the ligand bis[N-(6-pivalamido-2-pyridylmethyl)]benzylamine (H(2)pmb), which contains two carboxyamido units appended from pyridine rings. Several nickel complexes were prepared and structurally characterized. In particular, we found that the appended carboxyamido groups either provide intramolecular H-bond donors or can be converted to bind directly to a metal center. We established that the complex Ni(II)H(2)pmb(Cl)(2) can be sequentially deprotonated with potassium tert-butoxide, causing coordination of the carboxyamido oxygen atoms and concomitant loss of the chloro ligands. The chloro ligands were also removed with silver(I) salts-in the presence of acetate ions, the complex Ni(II)H(2)pmb(κ(2)-OAc)(κ(1)-OAc) was isolated, in which an intramolecular H-bonding network occurs between the H(2)pmb ligand and the coordinate acetato ligands.
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Affiliation(s)
- Darla A Powell-Jia
- Department of Chemistry, University of California Irvine, 1102 Natural Science II, Irvine, CA 92697 USA
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