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Beagan DM, Cabelof AC, Pink M, Carta V, Gao X, Caulton KG. Nickel-mediated N-N bond formation and N 2O liberation via nitrogen oxyanion reduction. Chem Sci 2021; 12:10664-10672. [PMID: 34447560 PMCID: PMC8356809 DOI: 10.1039/d1sc02846d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/13/2021] [Indexed: 12/26/2022] Open
Abstract
The syntheses of (DIM)Ni(NO3)2 and (DIM)Ni(NO2)2, where DIM is a 1,4-diazadiene bidentate donor, are reported to enable testing of bis boryl reduced N-heterocycles for their ability to carry out stepwise deoxygenation of coordinated nitrate and nitrite, forming O(Bpin)2. Single deoxygenation of (DIM)Ni(NO2)2 yields the tetrahedral complex (DIM)Ni(NO)(ONO), with a linear nitrosyl and κ1-ONO. Further deoxygenation of (DIM)Ni(NO)(ONO) results in the formation of dimeric [(DIM)Ni(NO)]2, where the dimer is linked through a Ni–Ni bond. The lost reduced nitrogen byproduct is shown to be N2O, indicating N–N bond formation in the course of the reaction. Isotopic labelling studies establish that the N–N bond of N2O is formed in a bimetallic Ni2 intermediate and that the two nitrogen atoms of (DIM)Ni(NO)(ONO) become symmetry equivalent prior to N–N bond formation. The [(DIM)Ni(NO)]2 dimer is susceptible to oxidation by AgX (X = NO3−, NO2−, and OTf−) as well as nitric oxide, the latter of which undergoes nitric oxide disproportionation to yield N2O and (DIM)Ni(NO)(ONO). We show that the first step in the deoxygenation of (DIM)Ni(NO)(ONO) to liberate N2O is outer sphere electron transfer, providing insight into the organic reductants employed for deoxygenation. Lastly, we show that at elevated temperatures, deoxygenation is accompanied by loss of DIM to form either pyrazine or bipyridine bridged polymers, with retention of a BpinO− bridging ligand. Deoxygenation of nitrogen oxyanions coordinated to nickel using reduced borylated heterocycles leads to N–N bond formation and N2O liberation. The nickel dimer product facilitates NO disproportionation, leading to a synthetic cycle.![]()
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Affiliation(s)
- Daniel M Beagan
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Alyssa C Cabelof
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Maren Pink
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Veronica Carta
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Xinfeng Gao
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - Kenneth G Caulton
- Indiana University, Department of Chemistry 800 E. Kirkwood Ave. Bloomington IN 47401 USA
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Heinemann J, Mayer T, Böttcher H. Intermediates en Route Towards Tetranitrosyl‐bis(diorganophosphanido)diiron Complexes. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jan Heinemann
- Department Chemie Ludwig-Maximilians-Universität Butenandtstr. 5–13 (D) 81377 München Germany
| | - Tobias Mayer
- Department Chemie Ludwig-Maximilians-Universität Butenandtstr. 5–13 (D) 81377 München Germany
| | - Hans‐Christian Böttcher
- Department Chemie Ludwig-Maximilians-Universität Butenandtstr. 5–13 (D) 81377 München Germany
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Beck D, Klüfers P. HN 2 O 2 - as a Ligand in Mononuclear Hydrogenhyponitrite-κ 2 -N,O Ruthenium Complexes with Bisphosphane Co-Ligands. Chemistry 2018; 24:16019-16028. [PMID: 30144196 DOI: 10.1002/chem.201803770] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Indexed: 01/21/2023]
Abstract
The hyponitrite anion is a tentative intermediate in the reduction of nitric oxide (NO) to nitrous oxide (N2 O) catalyzed by nitric-oxide reductase (NOR) in the process of bacterial denitrification. Owing to the considerable number of known coordination modes for the hyponitrito ligand, its actual bonding form in the enzymatic cycle is a point of current discussion. Here, we contribute to the hardly known ligand properties of a key intermediate, the monoprotonated hyponitrite anion. Three air- and water-stable ruthenium complexes with hydrogenhyponitrite as the ligand were synthesized by using commercially available bisphosphane co-ligands (1,2-bis(diphenylphosphino)ethane (dppe), 1,3-bis(diphenylphosphino)propane (dppp), 1,2-bis(diphenylphosphino)ethene (dppv)). The starting compounds [Ru(dppe)2 (tos)]BF4 (1) and [Ru(dppp)2 (tos)]BF4 (2) contained the bidentate coordinating tosylate anion (tos) as a particularly well-suited leaving group. To confirm the protonated and deprotonated species, X-ray diffraction, IR, UV/Vis spectroscopy (solution and solid state), solid-state NMR spectroscopy, and high-resolution mass spectroscopy were used. DFT calculations give insight into the bonding situation. We report on [Ru(dppe)2 (HN2 O2 )]BF4 (5), [Ru(dppp)2 (HN2 O2 )]BF4 (6), [Ru(dppv)2 (HN2 O2 )]BF4 (7), [Ru(dppp)2 (HN2 O2 )]BF4 ⋅Imi (9; Imi=imidazole) as the first mononuclear trans-hydrogenhyponitrite complexes. Isolated deprotonated analogs are [Ru(dppe)2 (N2 O2 )]⋅HImi(BF4 ) (8) and [Ru(dppv)2 (N2 O2 )] ⋅HImi(BF4 )⋅Imi (10).
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Affiliation(s)
- Daniel Beck
- Ludwig-Maximilians-Universitaet, Department of Chemistry, Butenandtstrasse 5-13, Haus D, München, 81377, Germany
| | - Peter Klüfers
- Ludwig-Maximilians-Universitaet, Department of Chemistry, Butenandtstrasse 5-13, Haus D, München, 81377, Germany
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Lionetti D, de Ruiter G, Agapie T. A trans-Hyponitrite Intermediate in the Reductive Coupling and Deoxygenation of Nitric Oxide by a Tricopper-Lewis Acid Complex. J Am Chem Soc 2016; 138:5008-11. [PMID: 27028157 DOI: 10.1021/jacs.6b01083] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reduction of nitric oxide (NO) to nitrous oxide (N2O) is a process relevant to biological chemistry as well as to the abatement of certain environmental pollutants. One of the proposed key intermediates in NO reduction is hyponitrite (N2O2(2-)), the product of reductive coupling of two NO molecules. We report the reductive coupling of NO by an yttrium-tricopper complex generating a trans-hyponitrite moiety supported by two μ-O-bimetallic (Y,Cu) cores, a previously unreported coordination mode. Reaction of the hyponitrite species with Brønsted acids leads to the generation of N2O, demonstrating the viability of the hyponitrite complex as an intermediate in NO reduction to N2O. The additional reducing equivalents stored in each tricopper unit are employed in a subsequent step for N2O reduction to N2, for an overall (partial) conversion of NO to N2. The combination of Lewis acid and multiple redox active metals facilitates this four electron conversion via an isolable hyponitrite intermediate.
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Affiliation(s)
- Davide Lionetti
- Division of Chemistry and Chemical Engineering, California Institute of Technology , 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| | - Graham de Ruiter
- Division of Chemistry and Chemical Engineering, California Institute of Technology , 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology , 1200 East California Boulevard, MC 127-72, Pasadena, California 91125, United States
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Affiliation(s)
- Ashley M. Wright
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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Alvarez MA, García ME, García-Vivó D, Melón S, Ruiz MA, Toyos A. Reactions of the unsaturated ditungsten complexes [W2Cp2(μ-PPh2)2(CO)x] (x = 1, 2) with nitric oxide: stereoselective carbonyl displacement and oxygen-transfer reactions of a nitrite ligand. Inorg Chem 2014; 53:4739-50. [PMID: 24739068 DOI: 10.1021/ic500498k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The dicarbonyl complex trans-[W2Cp2(μ-PPh2)2(CO)2] (Cp = η(5)-C5H5) reacted rapidly with NO (5% in N2) at 273 K to give selectively cis-[W2Cp2(μ-PPh2)2(NO)2]. In contrast, the analogous reactions of monocarbonyl [W2Cp2(μ-PPh2)2(μ-CO)] yielded either trans-[W2Cp2(μ-PPh2)2(NO)2] or the nitrito complex [W2Cp2(μ-PPh2)2(ONO)(CO)(NO)] (W-W = 2.9797(4) Å), depending on experimental conditions, with the latter presumably arising from reaction with trace amounts of oxygen in the medium. The stereoselectivity of the above reactions can be rationalized by assuming the participation of 33-electron [W2Cp2(μ-PPh2)2(CO)(NO)] intermediates which rapidly add a second molecule of NO via η(2)-C5H5 intermediates to eventually yield the corresponding dinitrosyls with inversion of the stereochemistry at the dimetal center, as supported by density functional theory (DFT) calculations. The nitrito complex was thermally unstable and evolved through oxygen transfer either to the carbonyl ligand, to yield the above dinitrosyls with release of CO2, or to the phosphide ligand, to give the phosphinito derivative cis-[W2Cp2(μ-OPPh2)(μ-PPh2)(NO)2], depending on experimental conditions. According to DFT calculations, the first process would involve transient dissociation/recombination of the nitrite ligand followed by coupling to carbonyl to give an intermediate with a chelate W{C,N-C(O)ON(O)} ring. Indeed, the nitrite ligand could be easily removed upon reaction of the nitrito complex with Na(BAr'4), but immediate decomposition also took place to render the electron-precise dicarbonyl [W2Cp2(μ-PPh2)2(CO)2(NO)]BAr'4 (W-W = 2.9663(3) Å) as the unique product (Ar' = 3,5-C6H3(CF3)2). Attempts to decarbonylate the latter complex photochemically yielded instead the oxo derivatives cis- and trans-[W2Cp2(μ-PPh2)2(O)(NO)]BAr'4 as the only isolable products (W-W = 2.980(2) and 3.0077(3) Å, respectively).
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Affiliation(s)
- M Angeles Alvarez
- Departamento de Química Orgánica e Inorgánica/IUQOEM, Universidad de Oviedo , E-33071 Oviedo, Spain
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Mayer T, Mayer P, Böttcher HC. Diazald: An entry to diruthenium complexes containing bridging nitrosyl ligands. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mayer T, Böttcher HC. Protonation of metal–metal bonds in nitrosyl-bridged diruthenium complexes. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Liao BS, Liu YH, Peng SM, Reddy KR, Liu SH, Chou PT, Liu ST. An unexpected semi-hydrogenation of a ligand in the complexation of 2,7-bispyridinyl-1,8-naphthyridine with Ru3(CO)12. Dalton Trans 2014; 43:3557-62. [DOI: 10.1039/c3dt53029a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A novel formate-bridged diruthenium complex [(bpnp-H3)Ru2(μ-HCOO)(CO)4] was prepared, in which the ligand bpnp was partially hydrogenated during the complexation of the ligand with Ru3(CO)12 in the presence of water.
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Affiliation(s)
- Bei-Sih Liao
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
| | - Yi-Hung Liu
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
| | - Shie-Ming Peng
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
| | - K. Rajender Reddy
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 607, India
| | - Shin-Hung Liu
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
| | - Shiuh-Tzung Liu
- Department of Chemistry
- National Taiwan University
- Taipei 106, Taiwan
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Böttcher HC, Mayer P, Mayer T. Synthesis and Molecular Structure of [Fe2(μ-PtBu2)2(NO)4]. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Arikawa Y, Ikeda A, Matsumoto N, Umakoshi K. Reactivity of a nitrosyl ligand on dinuclear ruthenium hydrotris(pyrazolyl)borato complexes toward a NO molecule. Dalton Trans 2013; 42:11626-31. [PMID: 23828251 DOI: 10.1039/c3dt51319j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A cationic mononitrosyl dinuclear ruthenium complex was prepared by removing one NO ligand of a dicationic dinitrosyl ruthenium complex using NaN3. Reduction and oxidation reactions of the mononitrosyl complex led to the isolation of a neutral nitrosyl-bridged complex and a dicationic mononitrosyl complex, respectively, as expected from the cyclic voltammogram. According to the electron count, their reactions with a second NO molecule resulted in an N-N coupling complex from the nitrosyl-bridged complex and the dicationic dinitrosyl complex from the dicationic mononitrosyl complex.
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Affiliation(s)
- Yasuhiro Arikawa
- Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Nagasaki, Japan.
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Mayer T, Böttcher HC. Protonation of metal–metal bonds in coordinatively unsaturated diruthenium cores. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.11.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Combining two coordinatively unsaturated diruthenium cores by the tetradentate ligand (Ph2P)2NCH2C6H4CH2N(PPh2)2. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.05.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mayer T, Böttcher HC. Reduktive Dimerisierung von NO an Dirutheniumkomplexen und Bildung eines tridentaten 2, 2-Bis(diphenylphosphanyl)ethanolato-Liganden. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mayer T, Böttcher HC. Crystal and Molecular Structure of the trans-Hyponitrite Compounds Ph3E(μ-ONNO)EPh3 (E = Ge, Pb). Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201100543] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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