1
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Westawker LP, Khusnutdinova JK, Wallick RF, Mirica LM. Palladium K-edge X-ray Absorption Spectroscopy Studies on Controlled Ligand Systems. Inorg Chem 2023; 62:21128-21137. [PMID: 38039413 DOI: 10.1021/acs.inorgchem.3c03032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2023]
Abstract
X-ray absorption spectroscopy (XAS) is widely used across the life and physical sciences to identify the electronic properties and structure surrounding a specific element. XAS is less often used for the characterization of organometallic compounds, especially for sensitive and highly reactive species. In this study, we used solid- and solution-phase XAS to compare a series of 25 palladium complexes in controlled ligand environments. The compounds include palladium centers in the formal I, II, III, and IV oxidation states, supported by tridentate and tetradentate macrocyclic ligands, with different halide and methyl ligand combinations. The Pd K-edge energies increased not only upon oxidizing the metal center but also upon increasing the denticity of the ligand framework, substituting sigma-donating methyl groups with chlorides, and increasing the charge of the overall metal complex by replacing charged ligands with neutral ligands. These trends were then applied to characterize compounds whose oxidation states were otherwise unconfirmed.
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Affiliation(s)
- Luke P Westawker
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Julia K Khusnutdinova
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Rachel F Wallick
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Liviu M Mirica
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
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2
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Waddell PM, Tian L, Scavuzzo AR, Venigalla L, Scholes GD, Carrow BP. Visible light-induced palladium-carbon bond weakening in catalytically relevant T-shaped complexes. Chem Sci 2023; 14:14217-14228. [PMID: 38098701 PMCID: PMC10717500 DOI: 10.1039/d3sc02588h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 10/26/2023] [Indexed: 12/17/2023] Open
Abstract
Triggering one-electron redox processes during palladium catalysis holds the potential to unlock new reaction mechanisms and synthetic methods not previously accessible in the typical two-electron reaction manifolds that dominate palladium catalysis. We report that T-shaped organopalladium(ii) complexes coordinated by a bulky monophosphine, a class of organometallic intermediate featured in a range of contemporary catalytic reactions, undergo blue light-promoted bond weakening leading to mild and efficient homolytic cleavage of strong Pd(ii)-C(sp3) bonds under ambient conditions. The origin of light-triggered radical formation in these systems, which lack an obvious ligand-based chromophore (i.e., π-systems), was investigated using a combination of DFT calculations, photoactinometry, and transient absorption spectroscopy. The available data suggest T-shaped organopalladium(ii) complexes manifest unusual blue light-accessible Pd-to-C(sp3) transition. The quantum efficiency and excited state lifetime of this process were unexpectedly superior compared to a prototypical (α-diimine)Pd(ii) complex featuring a low-lying, ligand-centered LUMO (π*). These results suggest coordinatively-unsaturated organopalladium(ii) compounds, catalysts in myriad catalytic processes, have untapped potential for one-electron reactivity under visible light excitation.
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Affiliation(s)
- Peter M Waddell
- Department of Chemistry, Princeton University Princeton NJ 08544 USA
| | - Lei Tian
- Department of Chemistry, Princeton University Princeton NJ 08544 USA
| | | | - Lalu Venigalla
- Department of Chemistry, University of Houston Houston TX 77204 USA
| | - Gregory D Scholes
- Department of Chemistry, Princeton University Princeton NJ 08544 USA
| | - Brad P Carrow
- Department of Chemistry, University of Houston Houston TX 77204 USA
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3
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Herrera VE, Charles TP, Scott TG, Prather KY, Nguyen NT, Sohl CD, Thomas LM, Richter-Addo GB. Insights into Nitrosoalkane Binding to Myoglobin Provided by Crystallography of Wild-Type and Distal Pocket Mutant Derivatives. Biochemistry 2023; 62:1406-1419. [PMID: 37011611 DOI: 10.1021/acs.biochem.2c00725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Nitrosoalkanes (R-N═O; R = alkyl) are biological intermediates that form from the oxidative metabolism of various amine (RNH2) drugs or from the reduction of nitroorganics (RNO2). RNO compounds bind to and inhibit various heme proteins. However, structural information on the resulting Fe-RNO moieties remains limited. We report the preparation of ferrous wild-type and H64A sw MbII-RNO derivatives (λmax 424 nm; R = Me, Et, Pr, iPr) from the reactions of MbIII-H2O with dithionite and nitroalkanes. The apparent extent of formation of the wt Mb derivatives followed the order MeNO > EtNO > PrNO > iPrNO, whereas the order was the opposite for the H64A derivatives. Ferricyanide oxidation of the MbII-RNO derivatives resulted in the formation of the ferric MbIII-H2O precursors with loss of the RNO ligands. X-ray crystal structures of the wt MbII-RNO derivatives at 1.76-2.0 Å resoln. revealed N-binding of RNO to Fe and the presence of H-bonding interactions between the nitroso O-atoms and distal pocket His64. The nitroso O-atoms pointed in the general direction of the protein exterior, and the hydrophobic R groups pointed toward the protein interior. X-ray crystal structures for the H64A mutant derivatives were determined at 1.74-1.80 Å resoln. An analysis of the distal pocket amino acid surface landscape provided an explanation for the differences in ligand orientations adopted by the EtNO and PrNO ligands in their wt and H64A structures. Our results provide a good baseline for the structural analysis of RNO binding to heme proteins possessing small distal pockets.
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Affiliation(s)
- Viridiana E Herrera
- Department of Chemistry and Physics, Ivory V. Nelson Science Center, Lincoln University, Lincoln University, Pennsylvania 19352, United States
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, 422 Curie Blvd, Philadelphia, Pennsylvania 19104, United States
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Tatyana P Charles
- Department of Chemistry and Physics, Ivory V. Nelson Science Center, Lincoln University, Lincoln University, Pennsylvania 19352, United States
| | - Tiala G Scott
- Department of Chemistry and Physics, Ivory V. Nelson Science Center, Lincoln University, Lincoln University, Pennsylvania 19352, United States
| | - Kiana Y Prather
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
- University of Oklahoma College of Medicine, 800 Stanton L. Young Blvd, Oklahoma City, Oklahoma 73117, United States
| | - Nancy T Nguyen
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
- University of Oklahoma College of Medicine, 800 Stanton L. Young Blvd, Oklahoma City, Oklahoma 73117, United States
| | - Christal D Sohl
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182, United States
| | - Leonard M Thomas
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - George B Richter-Addo
- Price Family Foundation Institute of Structural Biology and Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
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4
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Roseiro P, Petit L, Robert V, Yalouz S. Emergence of Spinmerism for Molecular Spin-Qubits Generation. Chemphyschem 2023; 24:e202200478. [PMID: 36161748 DOI: 10.1002/cphc.202200478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 09/20/2022] [Indexed: 01/20/2023]
Abstract
Molecular platforms are regarded as promising candidates in the generation of units of information for quantum computing. Herein, a strategy combining spin-crossover metal ions and radical ligands is proposed from a model Hamiltonian first restricted to exchange interactions. Unusual spin states structures emerge from the linkage of a singlet/triplet commutable metal centre with two doublet-radical ligands. The ground state nature is modulated by charge transfers and can exhibit a mixture of triplet and singlet local metal spin states. Besides, the superposition reaches a maximum for 2 K M = K 1 + K 2 ${2{K}_{M}={K}_{1}+{K}_{2}}$ , suggesting a necessary competition between the intramolecular K M ${{K}_{M}}$ and inter-metal-ligand K 1 ${{K}_{1}}$ and K 2 ${{K}_{2}}$ direct exchange interactions. The results promote spinmerism, an original manifestation of quantum entanglement between the spin states of a metal centre and radical ligands. The study provides insights into spin-coupled compounds and inspiration for the development of molecular spin-qubits.
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Affiliation(s)
- Pablo Roseiro
- Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/, Université de Strasbourg, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Louis Petit
- Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/, Université de Strasbourg, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Vincent Robert
- Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/, Université de Strasbourg, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Saad Yalouz
- Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/, Université de Strasbourg, 4 rue Blaise Pascal, 67000, Strasbourg, France
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5
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Panda S, Dhara S, Singh A, Dey S, Kumar Lahiri G. Metal-coordinated azoaromatics: Strategies for sequential azo-reduction, isomerization and application potential. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Harada T, Ando S, Kuwata S. Redox Non‐innocence of ortho‐Benzoquinone Dioximate Dianion in Ligand Exchange on Ruthenium. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Takuya Harada
- Tokyo Institute of Technology: Tokyo Kogyo Daigaku Department of Chemical Science and Engineering 2-12-1 O-okayama, Meguro-ku 152-8552 Tokyo JAPAN
| | - Shinji Ando
- Tokyo Institute of Technology: Tokyo Kogyo Daigaku Department of Chemical Science and Engineering 2-12-1 O-okayama, Meguro-ku 152-8552 Tokyo JAPAN
| | - Shigeki Kuwata
- Ritsumeikan University: Ritsumeikan Daigaku Department of Applied Chemistry 1-1-1 Noji-higashi 525-8577 Kusatsu JAPAN
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7
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Padmanaban S, Choi J, Vazquez-Lima H, Ko D, Yoo D, Gwak J, Cho KB, Lee Y. Nickel-Catalyzed NO Group Transfer Coupled with NO x Conversion. J Am Chem Soc 2022; 144:4585-4593. [PMID: 35157442 DOI: 10.1021/jacs.1c13560] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nitrogen oxide (NOx) conversion is an important process for balancing the global nitrogen cycle. Distinct from the biological NOx transformation, we have devised a synthetic approach to this issue by utilizing a bifunctional metal catalyst for producing value-added products from NOx. Here, we present a novel catalysis based on a Ni pincer system, effectively converting Ni-NOx to Ni-NO via deoxygenation with CO(g). This is followed by transfer of the in situ generated nitroso group to organic substrates, which favorably occurs at the flattened Ni(I)-NO site via its nucleophilic reaction. Successful catalytic production of oximes from benzyl halides using NaNO2 is presented with a turnover number of >200 under mild conditions. In a key step of the catalysis, a nickel(I)-•NO species effectively activates alkyl halides, which is carefully evaluated by both experimental and theoretical methods. Our nickel catalyst effectively fulfills a dual purpose, namely, deoxygenating NOx anions and catalyzing C-N coupling.
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Affiliation(s)
- Sudakar Padmanaban
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Jonghoon Choi
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Hugo Vazquez-Lima
- Department of Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - Donghwi Ko
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Dagyum Yoo
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Jinseong Gwak
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Kyung-Bin Cho
- Department of Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - Yunho Lee
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
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8
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Roseiro P, Ben Amor N, Robert V. Combining Open-Shell Verdazyl Environment and Co(II) Spin-Crossover: Spinmerism in Cobalt Oxoverdazyl Compound. Chemphyschem 2022; 23:e202100801. [PMID: 35212147 DOI: 10.1002/cphc.202100801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/11/2022] [Indexed: 11/07/2022]
Abstract
The spin states of a Co(II) oxoverdazyl compound are investigated by means of wavefunction-based calculations. Within a ca. 233 K energy window, the ground state and excited states display a structure-sensitive admixture of low-spin SM = 1/2 in a dominant high-spin SM = 3/2 Co(II) ion as read from localized molecular orbitals. This puzzling spins zoology that results from the coupling between open-shell radical ligands and a spin-crossover metal ion gives rise to this unusual scenario which extends the views in molecular magnetism. In agreement with experimental observation, the low-energy spectroscopy is very sensitive to deformations of the coordination sphere, and a growing admixture of Co(II) low-spin is evidenced from the calculations. In analogy with mesomerism that accounts for charge delocalization, entanglement combines different local spin states to generate a given total spin multiplicity, a spinmerism phenomenon.
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Affiliation(s)
- Pablo Roseiro
- UMR7177: Institut de Chimie de Strasbourg, Laboratoire de Chimie Quantique, 4 rue Blaise Pascal, 67000, Strasbourg, FRANCE
| | - Nadia Ben Amor
- UMR5626: Laboratoire de Chimie et Physique Quantique, Laboratoire de Chimie et Physique Quantiques, 118 route de Narbonne, 31062, Toulouse, FRANCE
| | - Vincent Robert
- Laboratoire de Chimie Quantique, Universit� de Strasbourg, Department of Chemistry, 4 rue Blaise Pascal, 67000, Strasbourg, FRANCE
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9
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Synthesis of Indoles by Palladium-Catalyzed Reductive Cyclization of β-Nitrostyrenes with Phenyl Formate as a CO Surrogate. Catalysts 2022. [DOI: 10.3390/catal12010106] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The reductive cyclization of suitably substituted organic nitro compounds by carbon monoxide is a very appealing technique for the synthesis of heterocycles because of its atom efficiency and easiness of separation of the only stoichiometric byproduct CO2, but the need for pressurized CO has hampered its diffusion. We have recently reported on the synthesis of indoles by reductive cyclization of o-nitrostyrenes using phenyl formate as a CO surrogate, using a palladium/1,10-phenanthroline complex as catalyst. However, depending on the desired substituents on the structure, the use of β-nitrostyrenes as alternative reagents may be advantageous. We report here the results of our study on the possibility to use phenyl formate as a CO surrogate in the synthesis of indoles by reductive cyclization of β-nitrostyrenes, using PdCl2(CH3CN)2 + phenanthroline as the catalyst. It turned out that good results can be obtained when the starting nitrostyrene bears an aryl substituent in the alpha position. However, when no such substituent is present, only fair yield of indole can be obtained because the base required to decompose the formate also catalyzes an oligo-polymerization of the starting styrene. The reaction can be performed in a single glass pressure tube, a cheap and easily available piece of equipment.
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10
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Lahiri GK, Panda S, Huang KW, Singh A, Dey S. Inner-sphere electron transfer at the ruthenium-azo interface. Dalton Trans 2022; 51:2547-2559. [DOI: 10.1039/d1dt03934b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal complexes exhibiting multiple reversible redox states have drawn continuing research interest due to their electron reservoir features. In this context, the present article described ruthenium-acac complexes (acac=acetylacetonate) incorporating redox-active...
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11
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Xu S, Yang D, Wang B, Chen Y, Ye S, Qu J. Generation of a Sulfinamide Species from Facile N-O Bond Cleavage of Nitrosobenzene by a Thiolate-Bridged Diiron Complex. J Am Chem Soc 2021; 143:17374-17387. [PMID: 34617736 DOI: 10.1021/jacs.1c03542] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The activation of nitrosobenzene promoted by transition-metal complexes has gained considerable interest due to its significance for understanding biological processes and catalytic C-N bond formation processes. Despite intensive studies in the past decades, there are only limited cases where electron-rich metal centers were commonly employed to achieve the N-O or C-N bond cleavage of the coordinated nitrosobenzene. In this regard, it is significant and challenging to construct a suitable functional system for examining its unique reactivity toward reductive activation of nitrosoarene. Herein, we present a {Fe2S2} functional platform that can activate nitrosobenzene via an unprecedented iron-directed thiolate insertion into the N-O bond to selectively generate a well-defined diiron benzenesulfinamide complex. Furthermore, computational studies support a proposal that in this concerted four-electron reduction process of nitrosobenzene the iron center serves as an important electron shuttle. Notably, compared to the intact bridging nitrosoarene ligand, the benzenesulfinamide moiety has priority to convert into aniline in the presence of separate or combined protons and reductants, which may imply the formation of the sulfinamide species accelerates reduction process of nitrosoarene. The reaction pattern presented here represents a novel activation mode of nitrosobenzene realized by a thiolate-bridged diiron complex.
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Affiliation(s)
- Sunlin Xu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China
| | - Yifeng Chen
- State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Centre for Biomanufacturing, Frontiers Science Center for Materiobiology and Dynamic Chemistry, East China University of Science and Technology, Shanghai 200237, P.R. China.,School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China
| | - Shengfa Ye
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.,State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Centre for Biomanufacturing, Frontiers Science Center for Materiobiology and Dynamic Chemistry, East China University of Science and Technology, Shanghai 200237, P.R. China
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12
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Singh H, MacKay A, Sheibany N, Chen F, Mosser M, Rouet PÉ, Rousseau F, Askari MS, Ottenwaelder X. Intramolecular H-bond stabilization of a primary hydroxylamine in salen-type metal complexes. Chem Commun (Camb) 2021; 57:10403-10406. [PMID: 34545379 DOI: 10.1039/d1cc03077a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Primary hydroxylamines, RNHOH, decompose readily in the presence of transition metal ions. We show that this reactivity can be arrested by ligand design via an intramolecular hydrogen bond. Six metal complexes with an intact NHOH group were synthesized and crystallographically characterized. The Cu-hydroxylamine complexes can catalyze the aerobic oxidation of benzylic alcohols.
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Affiliation(s)
- Hardeep Singh
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Alyson MacKay
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Nooshin Sheibany
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Fei Chen
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Maëlle Mosser
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Pierre-Étienne Rouet
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Frédéric Rousseau
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Mohammad S Askari
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
| | - Xavier Ottenwaelder
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada.
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13
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Abucayon EG, Chu JM, Ayala M, Khade RL, Zhang Y, Richter-Addo GB. Insight into the preferential N-binding versus O-binding of nitrosoarenes to ferrous and ferric heme centers. Dalton Trans 2021; 50:3487-3498. [PMID: 33634802 PMCID: PMC8061117 DOI: 10.1039/d0dt03604h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nitrosoarenes (ArNOs) are toxic metabolic intermediates that bind to heme proteins to inhibit their functions. Although much of their biological functions involve coordination to the Fe centers of hemes, the factors that determine N-binding or O-binding of these ArNOs have not been determined. We utilize X-ray crystallography and density functional theory (DFT) analyses of new representative ferrous and ferric ArNO compounds to provide the first theoretical insight into preferential N-binding versus O-binding of ArNOs to hemes. Our X-ray structural results favored N-binding of ArNO to ferrous heme centers, and O-binding to ferric hemes. Results of the DFT calculations rationalize this preferential binding on the basis of the energies of associated spin-states, and reveal that the dominant stabilization forces in the observed ferrous N-coordination and ferric O-coordination are dπ-pπ* and dσ-pπ*, respectively. Our results provide, for the first time, an explanation why in situ oxidation of the ferrous-ArNO compound to its ferric state results in the observed subsequent dissociation of the ligand.
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Affiliation(s)
- Erwin G Abucayon
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
| | - Jia-Min Chu
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, NJ 07030, USA.
| | - Megan Ayala
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
| | - Rahul L Khade
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, NJ 07030, USA.
| | - Yong Zhang
- Department of Chemistry and Chemical Biology, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, NJ 07030, USA.
| | - George B Richter-Addo
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019, USA.
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14
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Korb M, Hosseini Ghazvini SMB, Moggach SA, Meunier JF, Bousseksou A, Low PJ. Rip It off: Nitro to Nitroso Reduction by Iron Half-Sandwich Complexes. Inorg Chem 2021; 60:4986-4995. [DOI: 10.1021/acs.inorgchem.1c00042] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Marcus Korb
- The University of Western Australia, School of Molecular Sciences, 35 Stirling Highway, Crawley, Perth, Western Australia 6009, Australia
| | | | - Stephen A. Moggach
- The University of Western Australia, School of Molecular Sciences, 35 Stirling Highway, Crawley, Perth, Western Australia 6009, Australia
| | - Jean-François Meunier
- CNRS, Université de Toulouse, Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France
| | - Azzedine Bousseksou
- CNRS, Université de Toulouse, Laboratoire de Chimie de Coordination, 205 route de Narbonne, 31077 Toulouse, France
| | - Paul J. Low
- The University of Western Australia, School of Molecular Sciences, 35 Stirling Highway, Crawley, Perth, Western Australia 6009, Australia
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15
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Zsombor-Pindera J, Effaty F, Escomel L, Patrick B, Kennepohl P, Ottenwaelder X. Five Nitrogen Oxidation States from Nitro to Amine: Stabilization and Reactivity of a Metastable Arylhydroxylamine Complex. J Am Chem Soc 2020; 142:19023-19028. [PMID: 33124796 DOI: 10.1021/jacs.0c09300] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Redox noninnocent ligands enhance the reactivity of the metal they complex, a strategy used by metalloenzymes and in catalysis. Herein, we report a series of copper complexes with the same ligand framework, but with a pendant nitrogen group that spans five different redox states between nitro and amine. Of particular interest is the synthesis of a unprecedented copper(I)-arylhydroxylamine complex. While hydroxylamines typically disproportionate or decompose in the presence of transition metal ions, the reactivity of this metastable species is arrested by the presence of an intramolecular hydrogen bond. Two-electron oxidation yields a copper(II)-(arylnitrosyl radical) complex that can dissociate to a copper(I) species with uncoordinated arylnitroso. This combination of ligand redox noninnocence and hemilability provides opportunities in catalysis for two-electron chemistry via a one-electron copper(I/II) shuttle, as exemplified with an aerobic alcohol oxidation.
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Affiliation(s)
- Joseph Zsombor-Pindera
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC H4B 1R6, Canada.,Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Farshid Effaty
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC H4B 1R6, Canada
| | - Léon Escomel
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC H4B 1R6, Canada
| | - Brian Patrick
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Pierre Kennepohl
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Xavier Ottenwaelder
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC H4B 1R6, Canada
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16
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Askari MS, Effaty F, Gennarini F, Orio M, Le Poul N, Ottenwaelder X. Tuning Inner-Sphere Electron Transfer in a Series of Copper/Nitrosoarene Adducts. Inorg Chem 2020; 59:8678-8689. [PMID: 32073833 DOI: 10.1021/acs.inorgchem.9b03175] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A series of copper/nitrosoarene complexes was created that mimics several steps in biomimetic O2 activation by copper(I). The reaction of the copper(I) complex of N,N,N',N'-tetramethypropylenediamine with a series of para-substituted nitrosobenzene derivatives leads to adducts in which the nitrosoarene (ArNO) is reduced by zero, one, or two electrons, akin to the isovalent species dioxygen, superoxide, and peroxide, respectively. The geometric and electronic structures of these adducts were characterized by means of X-ray diffraction, vibrational analysis, ultraviolet-visible spectroscopy, NMR, electrochemistry, and density functional theory (DFT) calculations. The bonding mode of the NO moiety depends on the oxidation state of the ArNO moiety: κN for ArNO, mononuclear η2-NO and dinuclear μ-η2:η1 for ArNO•-, and dinuclear μ-η2:η2 for ArNO2-. 15N isotopic labeling confirms the reduction state by measuring the NO stretching frequency (1392 cm-1 for κN-ArNO, 1226 cm-1 for η2-ArNO•-, 1133 cm-1 for dinuclear μ-η2:η1-ArNO•-, and 875 cm-1 for dinuclear μ-η2:η2 for ArNO2-). The 15N NMR signal disappears for the ArNO•- species, establishing a unique diagnostic for the radical state. Electrochemical studies indicate reduction waves that are consistent with one-electron reduction of the adducts and are compared with studies performed on Cu-O2 analogues. DFT calculations were undertaken to confirm our experimental findings, notably to establish the nature of the charge-transfer transitions responsible for the intense green color of the complexes. In fine, this family of complexes is unique in that it walks through three redox states of the ArNO moiety while keeping the metal and its supporting ligand the same. This work provides snapshots of the reactivity of the toxic nitrosoarene molecules with the biologically relevant Cu(I) ion.
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Affiliation(s)
- Mohammad S Askari
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Farshid Effaty
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Federica Gennarini
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada.,Laboratoire de Chimie, Électrochimie Moléculaires et Chimie Analytique, UMR, CNRS 6521, Université de Bretagne Occidentale, Brest 29238, France
| | - Maylis Orio
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille 13007, France
| | - Nicolas Le Poul
- Laboratoire de Chimie, Électrochimie Moléculaires et Chimie Analytique, UMR, CNRS 6521, Université de Bretagne Occidentale, Brest 29238, France
| | - Xavier Ottenwaelder
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
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18
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Chan SC, Wong CY. Recent developments in ruthenium–nitrosoarene chemistry: Unconventional synthetic strategies, new ligand designs, and exploration of ligands redox non-innocence. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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19
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Affiliation(s)
- Dongyang Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Masilamani Tamizmani
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Xuebing Leng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen Guangdong 518055 China
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20
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Emhoff KA, Balaraman L, Salem AM, Mudarmah KI, Boyd WC. Coordination chemistry of organic nitric oxide derivatives. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Ferretti F, Ramadan DR, Ragaini F. Transition Metal Catalyzed Reductive Cyclization Reactions of Nitroarenes and Nitroalkenes. ChemCatChem 2019. [DOI: 10.1002/cctc.201901065] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Francesco Ferretti
- Dipartimento di ChimicaUniversità degli Studi di Milano via C. Golgi 19 Milano 20133 Italy
| | - Doaa R. Ramadan
- Dipartimento di ChimicaUniversità degli Studi di Milano via C. Golgi 19 Milano 20133 Italy
| | - Fabio Ragaini
- Dipartimento di ChimicaUniversità degli Studi di Milano via C. Golgi 19 Milano 20133 Italy
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22
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Wang D, Leng X, Ye S, Deng L. Substrate Redox Non-innocence Inducing Stepwise Oxidative Addition Reaction: Nitrosoarene C-N Bond Cleavage on Low-Coordinate Cobalt(0) Species. J Am Chem Soc 2019; 141:7731-7735. [PMID: 31042868 DOI: 10.1021/jacs.9b03726] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The reactions of nitrosoarenes with transition-metal species are fundamentally important for their relevance to metal-catalyzed transformations of organo-nitrogen compounds in organic synthesis and also the metabolization of nitroarenes and anilines in biology. In addition to the well-known reactivity of metal-mediated N-O bond activation and cleavage of nitrosoarenes, we present herein the first observation of a nitrosoarene C-N bond oxidative addition reaction upon the interaction of a three-coordinate cobalt(0) species [(IPr)Co(vtms)2] with 2,4,6-tri( tert-butyl)-1-nitroso-benzene (Ar*NO). The reaction produces a cobalt nitrosyl aryl complex, [(IPr)Co(Ar*)(NO)] (1), with a bis(nitrosoarene)cobalt complex, [(IPr)Co(η2-ONAr)(κ1- O-ONAr)] (2), as an intermediate. Spectroscopic characterizations, DFT calculations, and kinetic studies revealed that the redox non-innocence of nitrosoarene induces a stepwise pathway for the C-N bond oxidative addition reaction.
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Affiliation(s)
- Dongyang Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , P. R. China
| | - Xuebing Leng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , P. R. China
| | - Shengfa Ye
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , Mülheim an der Ruhr D-45470 , Germany
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , P. R. China
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23
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Ferretti E, Dechert S, Meyer F. Reductive Binding and Ligand-Based Redox Transformations of Nitrosobenzene at a Dinickel(II) Core. Inorg Chem 2019; 58:5154-5162. [DOI: 10.1021/acs.inorgchem.9b00256] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eleonora Ferretti
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
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24
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Dey S, Panda S, Ghosh P, Lahiri GK. Electronically Triggered Switchable Binding Modes of the C-Organonitroso (ArNO) Moiety on the {Ru(acac)2} Platform. Inorg Chem 2019; 58:1627-1637. [DOI: 10.1021/acs.inorgchem.8b03191] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sanchaita Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sanjib Panda
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Prabir Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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25
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EL-Atawy MA, Formenti D, Ferretti F, Ragaini F. Synthesis of 3,6-Dihydro-2H-[1, 2]-Oxazines from Nitroarenes and Conjugated Dienes, Catalyzed by Palladium/Phenanthroline Complexes and Employing Phenyl Formate as a CO Surrogate. ChemCatChem 2018. [DOI: 10.1002/cctc.201801223] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Mohamed A. EL-Atawy
- Chemistry Department, Faculty of Science; Taibah University; Yanbu 46423 Saudi Arabia
- Chemistry Department, Faculty of Science; Alexandria University; P.O. 426 Ibrahemia Alexandria 21321 Egypt
| | - Dario Formenti
- Dipartimento di Chimica; Università degli Studi di Milano Via Golgi 19; 20133 Milano Italy
| | - Francesco Ferretti
- Dipartimento di Chimica; Università degli Studi di Milano Via Golgi 19; 20133 Milano Italy
| | - Fabio Ragaini
- Dipartimento di Chimica; Università degli Studi di Milano Via Golgi 19; 20133 Milano Italy
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26
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Ghosh P, Dey S, Panda S, Lahiri GK. Solvent-Mediated Functionalization of Benzofuroxan on Electron-Rich Ruthenium Complex Platform. Chem Asian J 2018; 13:1582-1593. [DOI: 10.1002/asia.201800308] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/29/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Prabir Ghosh
- Department of Chemistry; Indian Institute of Technology Bombay; Powai Mumbai 400076 India
| | - Sanchaita Dey
- Department of Chemistry; Indian Institute of Technology Bombay; Powai Mumbai 400076 India
| | - Sanjib Panda
- Department of Chemistry; Indian Institute of Technology Bombay; Powai Mumbai 400076 India
| | - Goutam Kumar Lahiri
- Department of Chemistry; Indian Institute of Technology Bombay; Powai Mumbai 400076 India
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27
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Barnett BR, Figueroa JS. Zero-valent isocyanides of nickel, palladium and platinum as transition metal σ-type Lewis bases. Chem Commun (Camb) 2018; 52:13829-13839. [PMID: 27826607 DOI: 10.1039/c6cc07863j] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Transition metal complexes that contain metal-to-ligand retrodative σ-bonds have become the subject of increasing studies over the last decade. Lewis acidic "Z-type ligands" can modulate the electronic structure of their resultant complexes in a manner distinct from 2e- donor ligands, and can also engage in cooperative reactivity with a Lewis basic transition metal. In this Feature article, we summarize our work with transition metal isocyanide complexes of group 10 metals that have exploited metal-based σ-type Lewis basicity. While the complexes Ni(CNArMes2)3, Pd(CNArDipp2)2 and Pt(CNArDipp2)2 were initially targeted as analogues to unstable, low-coordinate metal carbonyls, it soon became apparent that these zero-valent metal centers bore appreciable Lewis basic qualities due largely to the enhanced σ-donor/π-acid ratio of isocyanides compared to CO. Detailed spectroscopic and structural studies of metal-only Lewis pairs (MOLPs) formed from these complexes have furthered our understanding of the electronic structure perturbations effected by Z-type ligand binding. In addition, the platinum (boryl)iminomethane (BIM) complex Pt(κ2-N,B-Cy2BIM)(CNArDipp2) has illuminated a general ligand design strategy that can engender significant reverse-dative interactions with buttressed Lewis acids, and also has expanded the known scope of cooperative reactivity that can be realized at a transition metal-borane linkage.
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Affiliation(s)
- Brandon R Barnett
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, California 92093, USA.
| | - Joshua S Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, California 92093, USA.
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28
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Palluccio TD, Cai X, Majumdar S, Serafim LF, Tomson NC, Wieghardt K, Cazin CSJ, Nolan SP, Rybak-Akimova EV, Fernández-González MÁ, Temprado M, Captain B, Hoff CD. Ligand-Directed Reactivity in Dioxygen and Water Binding to cis-[Pd(NHC) 2(η 2-O 2)]. J Am Chem Soc 2018; 140:264-276. [PMID: 29172489 DOI: 10.1021/jacs.7b09905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Reaction of [Pd(IPr)2] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and O2 leads to the surprising discovery that at low temperature the initial reaction product is a highly labile peroxide complex cis-[Pd(IPr)2(η2-O2)]. At temperatures ≳ -40 °C, cis-[Pd(IPr)2(η2-O2)] adds a second O2 to form trans-[Pd(IPr)2(η1-O2)2]. Squid magnetometry and EPR studies yield data that are consistent with a singlet diradical ground state with a thermally accessible triplet state for this unique bis-superoxide complex. In addition to reaction with O2, cis-[Pd(IPr)2(η2-O2)] reacts at low temperature with H2O in methanol/ether solution to form trans-[Pd(IPr)2(OH)(OOH)]. The crystal structure of trans-[Pd(IPr)2(OOH)(OH)] is reported. Neither reaction with O2 nor reaction with H2O occurs under comparable conditions for cis-[Pd(IMes)2(η2-O2)] (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene). The increased reactivity of cis-[Pd(IPr)2(η2-O2)] is attributed to the enthalpy of binding of O2 to [Pd(IPr)2] (-14.5 ± 1.0 kcal/mol) that is approximately one-half that of [Pd(IMes)2] (-27.9 ± 1.5 kcal/mol). Computational studies identify the cause as interligand repulsion forcing a wider C-Pd-C angle and tilting of the NHC plane in cis-[Pd(IPr)2(η2-O2)]. Arene-arene interactions are more favorable and serve to further stabilize cis-[Pd(IMes)2(η2-O2)]. Inclusion of dispersion effects in DFT calculations leads to improved agreement between experimental and computational enthalpies of O2 binding. A complete reaction diagram is constructed for formation of trans-[Pd(IPr)2(η1-O2)2] and leads to the conclusion that kinetic factors inhibit formation of trans-[Pd(IMes)2(η1-O2)2] at the low temperatures at which it is thermodynamically favored. Failure to detect the predicted T-shaped intermediate trans-[Pd(NHC)2(η1-O2)] for either NHC = IMes or IPr is attributed to dynamic effects. A partial potential energy diagram for initial binding of O2 is constructed. A range of low-energy pathways at different angles of approach are present and blur the distinction between pure "side-on" or "end-on" trajectories for oxygen binding.
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Affiliation(s)
- Taryn D Palluccio
- Department of Chemistry, Tufts University , 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Xiaochen Cai
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Subhojit Majumdar
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Leonardo F Serafim
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Neil C Tomson
- Max-Planck Institute for Chemical Energy Conversion , Mülheim an der Ruhr, Germany.,Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Karl Wieghardt
- Max-Planck Institute for Chemical Energy Conversion , Mülheim an der Ruhr, Germany
| | - Catherine S J Cazin
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University , Campus Sterre, Building S-3, Krijgslaan 281, Ghent 9000, Belgium
| | - Steven P Nolan
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University , Campus Sterre, Building S-3, Krijgslaan 281, Ghent 9000, Belgium
| | - Elena V Rybak-Akimova
- Department of Chemistry, Tufts University , 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Miguel Ángel Fernández-González
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá , Madrid 28871, Spain
| | - Manuel Temprado
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá , Madrid 28871, Spain
| | - Burjor Captain
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Carl D Hoff
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
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29
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Effaty F, Zsombor-Pindera J, Kazakova A, Girard B, Askari MS, Ottenwaelder X. Ligand and electronic effects on copper–arylnitroso self-assembly. NEW J CHEM 2018. [DOI: 10.1039/c8nj00894a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The topology and degree of electron transfer in self-assembled redox reactions between copper(i) species and nitrosoarenes are controlled by ligand properties.
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Affiliation(s)
- F. Effaty
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
| | - J. Zsombor-Pindera
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
| | - A. Kazakova
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
| | - B. Girard
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
| | - M. S. Askari
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
| | - X. Ottenwaelder
- Department of Chemistry and Biochemistry
- Concordia University
- Montreal
- Canada
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30
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Ferretti F, Rimoldi M, Ragaini F, Macchi P. Reaction of arylhydroxylamines with [Pd(Neoc)(NO3)2] (Neoc = neocuproine). Non-innocent behavior of the nitrate anion. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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Walroth RC, Miles KC, Lukens JT, MacMillan SN, Stahl SS, Lancaster KM. Electronic Structural Analysis of Copper(II)-TEMPO/ABNO Complexes Provides Evidence for Copper(I)-Oxoammonium Character. J Am Chem Soc 2017; 139:13507-13517. [PMID: 28921958 DOI: 10.1021/jacs.7b07186] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Copper/aminoxyl species are proposed as key intermediates in aerobic alcohol oxidation. Several possible electronic structural descriptions of these species are possible, and the present study probes this issue by examining four crystallographically characterized Cu/aminoxyl halide complexes by Cu K-edge, Cu L2,3-edge, and Cl K-edge X-ray absorption spectroscopy. The mixing coefficients between Cu, aminoxyl, and halide orbitals are determined via these techniques with support from density functional theory. The emergent electronic structure picture reveals that Cu coordination confers appreciable oxoammonium character to the aminoxyl ligand. The computational methodology is extended to one of the putative intermediates invoked in catalytic Cu/aminoxyl-driven alcohol oxidation reactions, with similar findings. Collectively, the results have important implications for the mechanism of alcohol oxidation and the underlying basis for cooperativity in this co-catalyst system.
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Affiliation(s)
- Richard C Walroth
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853, United States
| | - Kelsey C Miles
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - James T Lukens
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853, United States
| | - Samantha N MacMillan
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853, United States
| | - Shannon S Stahl
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Kyle M Lancaster
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853, United States
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32
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Ferretti F, Formenti D, Ragaini F. The reduction of organic nitro compounds by carbon monoxide as an effective strategy for the synthesis of N-heterocyclic compounds: a personal account. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2017. [DOI: 10.1007/s12210-017-0601-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Ghosh P, Banerjee S, Lahiri GK. Ruthenium Derivatives of in Situ Generated Redox-Active 1,2-Dinitrosobenzene and 2-Nitrosoanilido. Diverse Structural and Electronic Forms. Inorg Chem 2016; 55:12832-12843. [DOI: 10.1021/acs.inorgchem.6b02197] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Prabir Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Soumyodip Banerjee
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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34
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Kundu S, Stieber SCE, Ferrier MG, Kozimor SA, Bertke JA, Warren TH. Redox Non‐Innocence of Nitrosobenzene at Nickel. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Subrata Kundu
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - S. Chantal E. Stieber
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Chemistry and Biochemistry California State Polytechnic University Pomona CA 91768 USA
| | - Maryline G. Ferrier
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Stosh A. Kozimor
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Jeffery A. Bertke
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Timothy H. Warren
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
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35
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Kundu S, Stieber SCE, Ferrier MG, Kozimor SA, Bertke JA, Warren TH. Redox Non‐Innocence of Nitrosobenzene at Nickel. Angew Chem Int Ed Engl 2016; 55:10321-5. [DOI: 10.1002/anie.201605026] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Subrata Kundu
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - S. Chantal E. Stieber
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
- Department of Chemistry and Biochemistry California State Polytechnic University Pomona CA 91768 USA
| | - Maryline G. Ferrier
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Stosh A. Kozimor
- Inorganic, Isotope and Actinide Chemistry, Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Jeffery A. Bertke
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
| | - Timothy H. Warren
- Department of Chemistry Georgetown University Box 571227 Washington DC 20057-1227 USA
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36
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McNeece AJ, Mokhtarzadeh CC, Moore CE, Rheingold AL, Figueroa JS. Nickel bis- m-terphenylisocyanide dihalide complexes formed from 1,2-alkyl dihalides: probing for isolable β-haloalkyl complexes of square planar nickel. J COORD CHEM 2016. [DOI: 10.1080/00958972.2016.1172702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Andrew J. McNeece
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA
| | | | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA
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Mokhtarzadeh CC, Rheingold AL, Figueroa JS. Dinitrogen binding, P4-activation and aza-Büchner ring expansions mediated by an isocyano analogue of the CpCo(CO) fragment. Dalton Trans 2016; 45:14561-9. [DOI: 10.1039/c6dt02789j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Synthetic studies targeting an m-terphenyl isocyanide analogue of the unstable 16e−, S = 1 complex CpCo(CO) are reported (Cp = η5-C5H5).
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Affiliation(s)
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry
- University of California
- San Diego
- La Jolla
- USA
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry
- University of California
- San Diego
- La Jolla
- USA
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38
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Barnett BR, Moore CE, Chandrasekaran P, Sproules S, Rheingold AL, DeBeer S, Figueroa JS. Metal-only Lewis pairs between group 10 metals and Tl(i) or Ag(i): insights into the electronic consequences of Z-type ligand binding. Chem Sci 2015; 6:7169-7178. [PMID: 29861954 PMCID: PMC5951196 DOI: 10.1039/c5sc03104d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 09/17/2015] [Indexed: 11/21/2022] Open
Abstract
Complexes bearing electron rich transition metal centers, especially those displaying coordinative unsaturation, are well-suited to form reverse-dative σ-interactions with Lewis acids. Herein we demonstrate the generality of zerovalent, group 10 m-terphenyl isocyanide complexes to form reverse-dative σ-interactions to Tl(i) and Ag(i) centers. Structural and spectroscopic investigations of these metal-only Lewis pairs (MOLPs) has allowed insight into the electronic consequences of Lewis-acid ligation within the primary coordination sphere of a transition metal center. Treatment of the bis-isocyanide complex, Pt(CNArDipp2)2 (ArDipp2 = 2,6-(2,6-(i-Pr)2C6H3)2C6H3) with TlOTf (OTf = [O3SCF3]-) yields the Pt/Tl MOLP [TlPt(CNArDipp2)2]OTf (1). 1H NMR and IR spectroscopic studies on 1, and its Pd congener [TlPd(CNArDipp2)2]OTf (2), demonstrate that the M → Tl interaction is labile in solution. However, treatment of complexes 1 and 2 with Na[BArF4] (ArF = 3,5-(CF3)2C6H3) produces [TlPt(CNArDipp2)2]BArF4 (3) and [TlPd(CNArDipp2)2]BArF4 (4), in which Tl(i) binding is shown to be static by IR spectroscopy and, in the case of 3, 195Pt NMR spectroscopy as well. This result provides strong evidence that the M → Tl linkages can be attributed primarily to σ-donation from the group 10 metal to Tl, as loss of ionic stabilization of Tl by the triflate anion is compensated for by increasing the degree of M → Tl σ-donation. In addition, X-ray Absorption Near-Edge Spectroscopy (XANES) on the Pd/Tl and Ni/Tl MOLPs, [TlPd(CNArDipp2)2]OTf (2) and [TlNi(CNArMes2)3]OTf, respectively, is used to illustrate that the formation of a reverse-dative σ-interaction with Tl(i) does not alter the spectroscopic oxidation state of the group 10 metal. Also reported is the ability of M(CNArDipp2)2 (M = Pt, Pd) to form MOLPs with Ag(i), yielding the complexes [AgM(CNArDipp2)2]OTf (5, M = Pt; 6, M = Pd). As was determined for the Tl-containing MOLPs 1-4, it is shown that the spectroscopic oxidation states of the group 10 metal in 5 and 6 are essentially unchanged compared to the zerovalent precursors M(CNArDipp2)2. However, in the case of 5 and 6, the formation of a dative M → Ag σ-bonding interaction facilitates the binding of Lewis bases to the group 10 metal trans to Ag, illustrating the potential of acceptor fragments to open up new coordination sites on transition metal complexes without formal, two-electron oxidation.
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Affiliation(s)
- Brandon R Barnett
- Department of Chemistry and Biochemistry , University of California , San Diego, 9500 Gilman Drive, Mail Code 0358 , La Jolla , CA 92093 , USA .
| | - Curtis E Moore
- Department of Chemistry and Biochemistry , University of California , San Diego, 9500 Gilman Drive, Mail Code 0358 , La Jolla , CA 92093 , USA .
| | | | - Stephen Sproules
- School of Chemistry , University of Glasgow , Glasgow G12 8QQ , UK
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry , University of California , San Diego, 9500 Gilman Drive, Mail Code 0358 , La Jolla , CA 92093 , USA .
| | - Serena DeBeer
- Max-Planck-Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , D-45470 , Mülheim an der Ruhr , Germany.,Department of Chemistry and Chemical Biology , Cornell University , Ithaca , New York 14853 , USA
| | - Joshua S Figueroa
- Department of Chemistry and Biochemistry , University of California , San Diego, 9500 Gilman Drive, Mail Code 0358 , La Jolla , CA 92093 , USA .
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39
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Agnew DW, Moore CE, Rheingold AL, Figueroa JS. Kinetic Destabilization of Metal-Metal Single Bonds: Isolation of a Pentacoordinate Manganese(0) Monoradical. Angew Chem Int Ed Engl 2015; 54:12673-7. [DOI: 10.1002/anie.201506498] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Indexed: 11/07/2022]
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Agnew DW, Moore CE, Rheingold AL, Figueroa JS. Kinetic Destabilization of Metal–Metal Single Bonds: Isolation of a Pentacoordinate Manganese(0) Monoradical. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506498] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Douglas W. Agnew
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA 92193 (USA)
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA 92193 (USA)
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA 92193 (USA)
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive MC 0358, La Jolla, CA 92193 (USA)
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41
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Ferretti F, EL-Atawy MA, Muto S, Hagar M, Gallo E, Ragaini F. Synthesis of Indoles by Palladium-Catalyzed Reductive Cyclization of β-Nitrostyrenes with Carbon Monoxide as the Reductant. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500933] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Barnett BR, Labios LA, Moore CE, England J, Rheingold AL, Wieghardt K, Figueroa JS. Solution Dynamics of Redox Noninnocent Nitrosoarene Ligands: Mapping the Electronic Criteria for the Formation of Persistent Metal-Coordinated Nitroxide Radicals. Inorg Chem 2015; 54:7110-21. [DOI: 10.1021/acs.inorgchem.5b01252] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brandon R. Barnett
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Liezel A. Labios
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Jason England
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse
34−36, D-45470 Mülheim an der Ruhr, Germany
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
| | - Karl Wieghardt
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse
34−36, D-45470 Mülheim an der Ruhr, Germany
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
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43
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Askari MS, Orio M, Ottenwaelder X. Controlled nitrene transfer from a tyrosinase-like arylnitroso-copper complex. Chem Commun (Camb) 2015; 51:11206-9. [PMID: 26077731 DOI: 10.1039/c5cc02806j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction between p-nitrosonitrobenzene and the tetramethylpropylenediamine-copper(i) complex yields a dinuclear complex that is structurally and electronically similar to side-on peroxo species known in Cu/O2 chemistry. The complex reacts with di-tert-butylphenolate via nitrene transfer, as observed through an intermediate and the aminophenol product obtained upon reductive work-up.
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Affiliation(s)
- Mohammad S Askari
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC H4B 1R6, Canada.
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Mokhtarzadeh CC, Margulieux GW, Carpenter AE, Weidemann N, Moore CE, Rheingold AL, Figueroa JS. Synthesis and protonation of an encumbered iron tetraisocyanide dianion. Inorg Chem 2015; 54:5579-87. [PMID: 25965161 DOI: 10.1021/acs.inorgchem.5b00730] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reported here are synthetic studies probing highly reduced iron centers in an encumbering tetraisocyano ligand environment. Treatment of FeCl2 with sodium amalgam in the presence of 2 equiv of the m-terphenyl isocyanide CNAr(Mes2) (Ar(Mes2) = 2,6-(2,4,6-Me3C6H2)2C6H3) produces the disodium tetraisocyanoferrate Na2[Fe(CNAr(Mes2))4]. Structural characterization of Na2[Fe(CNAr(Mes2))4] revealed a tight ion pair, with the Fe center adopting a tetrahedral coordination geometry consistent with a d(10) metal center. Attempts to disrupt the cation-anion contacts in Na2[Fe(CNAr(Mes2))4] with cation-sequestration reagents lead to decomposition, except for the case of 18-crown-6, where a mononuclear complex featuring a dianionic 1-azabenz[b]azulene ligand was isolated in low yield. Formation of this 1-azabenz[b]azulene is rationalized to proceed by an aza-Büchner ring expansion of a CNAr(Mes2) ligand mediated by a coordinatively unsaturated Fe center. Disodium tetraisocyanoferrate Na2[Fe(CNAr(Mes2))4] is readily protonated by trimethylsilanol (HOSiMe3) to produce the monohydride ferrate salt, Na[HFe(CNAr(Mes2))4], the anionic portion of which serves as an isocyano analogue of the hydrido-tetracarbonyl metalate [HFe(CO)4](-). Treatment of Na[HFe(CNAr(Mes2))4] with methyl triflate (MeOTf; OTf = [O3SCF3](-)) at low temperature in the presence of dinitrogen yields the five-coordinate Fe(0) complex Fe(N2)(CNAr(Mes2))4. The formation of Fe(N2)(CNAr(Mes2))4 in this reaction is consistent with the intermediacy of the neutral tetraisocyanide Fe(CNAr(Mes2))4. The decomposition of Fe(N2)(CNAr(Mes2))4 to the dimeric complex [Fe(η(6)-(Mes)-μ(2)-C-CNAr(Mes))]2 and a seven-membered cyclic imine derived from a CNAr(Mes2) ligand is presented and provides insight into the ability of CNAr(Mes2) and related m-terphenyl isocyanides to stabilize zerovalent four-coordinate iron complexes in a strongly π-acidic ligand field.
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Affiliation(s)
- Charles C Mokhtarzadeh
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Grant W Margulieux
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Alex E Carpenter
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Nils Weidemann
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
| | - Joshua S Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive Mail Code 0358, La Jolla California 92093-0358, United States
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45
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Tomson NC, Williams KD, Dai X, Sproules S, DeBeer S, Warren TH, Wieghardt K. Re-evaluating the Cu K pre-edge XAS transition in complexes with covalent metal-ligand interactions. Chem Sci 2015; 6:2474-2487. [PMID: 29308158 PMCID: PMC5647745 DOI: 10.1039/c4sc03294b] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 02/11/2015] [Indexed: 01/10/2023] Open
Abstract
Three [Me2NN]Cu(η2-L2) complexes (Me2NN = HC[C(Me)NAr]2; L2 = PhNO (2), (3), PhCH[double bond, length as m-dash]CH2 (4); Ar = 2,6-Me2-C6H3; ArF = 3,5-(CF3)2-C6H3) have been studied by Cu K-edge X-ray absorption spectroscopy, as well as single- and multi-reference computational methods (DFT, TD-DFT, CASSCF, MRCI, and OVB). The study was extended to a range of both known and theoretical compounds bearing 2p-element donors as a means of deriving a consistent view of how the pre-edge transition energy responds in systems with significant ground state covalency. The ground state electronic structures of many of the compounds under investigation were found to be strongly influenced by correlation effects, resulting in ground state descriptions with majority contributions from a configuration comprised of a Cu(ii) metal center anti-ferromagentically coupled to radical anion O2, PhNO, and ligands. In contrast, the styrene complex 4, which displays a Cu K pre-edge transition despite its formal d10 electron configuration, exhibits what can best be described as a Cu(i):(styrene)0 ground state with strong π-backbonding. The Cu K pre-edge features for these complexes increase in energy from 1 to 4, a trend that was tracked to the percent Cu(ii)-character in the ground state. The unexpected shift to higher pre-edge transition energies with decreasing charge on copper (Q Cu) contributed to an assignment of the pre-edge features for these species as arising from metal-to-ligand charge transfer instead of the traditional Cu1s → Cu3d designation.
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Affiliation(s)
- Neil C Tomson
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany . ;
| | - Kamille D Williams
- Department of Chemistry , Georgetown University , Box 571227-1227 , Washington, D. C. 20057 , USA .
| | - Xuliang Dai
- Department of Chemistry , Georgetown University , Box 571227-1227 , Washington, D. C. 20057 , USA .
| | - Stephen Sproules
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany . ;
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany . ;
- Department of Chemistry and Chemical Biology , Cornell University , Ithaca , NY 14853 , USA
| | - Timothy H Warren
- Department of Chemistry , Georgetown University , Box 571227-1227 , Washington, D. C. 20057 , USA .
| | - Karl Wieghardt
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany . ;
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46
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Arikawa Y, Yamaguchi S, Otsubo Y, Onishi M, Umakoshi K. Ortho−Nitrosation of Anilines on a Ruthenium Hydridotris(pyrazolyl)borato Complex and Oxidation of the Resulting Coordinated Amine Groups. Organometallics 2015. [DOI: 10.1021/om5012769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yasuhiro Arikawa
- Division of Chemistry and Materials Science, Graduate School of Engineering, and ‡Department of
Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan
| | - Soseki Yamaguchi
- Division of Chemistry and Materials Science, Graduate School of Engineering, and ‡Department of
Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan
| | - Yuji Otsubo
- Division of Chemistry and Materials Science, Graduate School of Engineering, and ‡Department of
Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan
| | - Masayoshi Onishi
- Division of Chemistry and Materials Science, Graduate School of Engineering, and ‡Department of
Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan
| | - Keisuke Umakoshi
- Division of Chemistry and Materials Science, Graduate School of Engineering, and ‡Department of
Applied Chemistry, Faculty of Engineering, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan
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Carpenter AE, Mokhtarzadeh CC, Ripatti DS, Havrylyuk I, Kamezawa R, Moore CE, Rheingold AL, Figueroa JS. Comparative measure of the electronic influence of highly substituted aryl isocyanides. Inorg Chem 2015; 54:2936-44. [PMID: 25700244 DOI: 10.1021/ic5030845] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To assess the relative electronic influence of highly substituted aryl isocyanides on transition metal centers, a series of C4v-symmetric Cr(CNR)(CO)5 complexes featuring various alkyl, aryl, and m-terphenyl substituents have been prepared. A correlation between carbonyl-ligand (13)C{(1)H} NMR chemical shift (δCO) and calculated Cotton-Kraihanzel (C-K) force constant (kCO) is presented for these complexes to determine the relative changes in isocyanide σ-donor/π-acid ratio as a function of substituent identity and pattern. For nonfluorinated aryl isocyanides possessing alkyl or aryl substitution, minimal variation in effective σ-donor/π-acid ratio is observed over the series. In addition, aryl isocyanides featuring strongly electron-releasing substituents display an electronic influence that nearly matches that of nonfluorinated alkyl isocyanides. Lower σ-donor/π-acid ratios are displayed by polyfluorinated aryl isocyanide ligands. However, the degree of this attenuation relative to nonfluorinated aryl isocyanides is not substantial and significantly higher σ-donor/π-acid ratios than CO are observed in all cases. Substituent patterns for polyfluorinated aryl isocyanides are identified that give rise to low relative σ-donor/π-acid ratios but offer synthetic convenience for coordination chemistry applications. In order to expand the range of available substitution patterns for comparison, the syntheses of the new m-terphenyl isocyanides CNAr(Tripp2), CNp-MeAr(Mes2), CNp-MeAr(DArF2), and CNp-FAr(DArF2) are also reported (Ar(Tripp2) = 2,6-(2,4,6-(i-Pr)3C6H2)2C6H3); p-MeAr(Mes2) = 2,6-(2,4,6-Me3C6H2)2-4-Me-C6H2); p-MeAr(DArF2) = 2,6-(3,5-(CF3)2C6H3)2-4-Me-C6H2); p-FAr(DArF2) = 2,6-(3,5-(CF3)2C6H3)2-4-F-C6H2).
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Affiliation(s)
- Alex E Carpenter
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, Mail Code 0358, La Jolla, California, 92093-0358, United States
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Chan SC, England J, Wieghardt K, Wong CY. Trapping of the putative 1,2-dinitrosoarene intermediate of benzofuroxan tautomerization by coordination at ruthenium and exploration of its redox non-innocence. Chem Sci 2014. [DOI: 10.1039/c4sc01185f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The N,N′-coordinated 1,2-dinitrosoarenes represent a new class of redox-active bidentate ligand.
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Affiliation(s)
- Siu-Chung Chan
- Department of Biology and Chemistry
- City University of Hong Kong
- Kowloon, People's Republic of China
| | - Jason England
- Max-Planck-Institut für Chemische EnergieKonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Karl Wieghardt
- Max-Planck-Institut für Chemische EnergieKonversion
- 45470 Mülheim an der Ruhr, Germany
| | - Chun-Yuen Wong
- Department of Biology and Chemistry
- City University of Hong Kong
- Kowloon, People's Republic of China
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Hänninen MM, Paturi P, Tuononen HM, Sillanpää R, Lehtonen A. Heptacoordinated Molybdenum(VI) Complexes of Phenylenediamine Bis(phenolate): A Stable Molybdenum Amidophenoxide Radical. Inorg Chem 2013; 52:5714-21. [DOI: 10.1021/ic302355b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mikko M. Hänninen
- Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Jyväskylä,
Finland
| | - Petriina Paturi
- Wihuri Physical
Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - Heikki M. Tuononen
- Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Jyväskylä,
Finland
| | - Reijo Sillanpää
- Department of Chemistry, P.O. Box 35, University of Jyväskylä, FI-40014 Jyväskylä,
Finland
| | - Ari Lehtonen
- Department of Chemistry, University of Turku, FI-20014 Turku,
Finland
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50
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Chan SC, England J, Lee WC, Wieghardt K, Wong CY. Noninnocent Behavior of Nitrosoarene-Pyridine Hybrid Ligands: Ruthenium Complexes Bearing a 2-(2-Nitrosoaryl)Pyridine Monoanion Radical. Chempluschem 2013. [DOI: 10.1002/cplu.201200314] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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