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Chen Z, Liu J, Ou W, Kato T, Wang Z, Chen Y, Liu Y, Maruoka K. Development of Axially Chiral Pyridylidene Amine Ligands and their Application in Pd-Catalyzed Enantioselective Allylic Substitution. J Org Chem 2024; 89:12800-12811. [PMID: 39159454 DOI: 10.1021/acs.joc.4c01334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
A series of novel axially chiral pyridylidene amine (PYE) ligands has been developed, and their catalytic capability has been demonstrated in various highly efficient and enantioselective Pd-catalyzed asymmetric allylic substitutions. A density-functional theory (DFT) study explains the preferential enantiocontrol in the key transition states of the axially chiral PYE ligand-promoted Pd-catalyzed allylic alkylation.
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Affiliation(s)
- Zhikang Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Jiahao Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Weiying Ou
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Terumasa Kato
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Laboratory of Organocatalytic Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Zhe Wang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Yong Chen
- China National Analysis Center, Guangzhou 510070, P. R. China
| | - Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Keiji Maruoka
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, P. R. China
- Laboratory of Organocatalytic Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
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2
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Race JJ, Hudson LA, Albrecht M. Stable CAAC-Triazenes: A New Nitrogen Ligand System With Donor and Conformational Flexibility, and With Application in Olefin Activation Catalysis. Chemistry 2024; 30:e202400400. [PMID: 38687878 DOI: 10.1002/chem.202400400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/30/2024] [Accepted: 04/30/2024] [Indexed: 05/02/2024]
Abstract
N-heterocyclic imines such as pyridylidene amines impart high catalytic activity when coordinated to a transition metal, largely imposed by their electronic flexibility. Here, this donor flexibility has been applied for the first time to CAAC-based systems through the synthesis of CAAC-triazenes. These new ligands offer a larger π-conjugation that extends from the N-heterocyclic carbene through three nitrogens rather than just one, as observed in N-heterocyclic imines. We demonstrate the straightforward synthesis of three new CAAC-triazenes containing different substituents on the terminal triazene nitrogen. These compounds are remarkably stable up to 120 °C without loss of N2 as typically observed with similar triazenes. E-to-Z isomerization within the triazene is instigated by UV light and is partially reversible dependent on the triazene substituent. The quinoline-substituted CAAC-triazene 1-Q has been applied as an L,L'-type ligand in the synthesis of [PdCl2(1-Q)], [PdCl(Me)(1-Q)] and [Pd(Me)(H2O(1-Q)]+. E-to-Z ligand isomerization also occurs when coordinated to PdCl2, providing access to on-metal manipulation. The cationic complex [PdMe(H2O)(1-Q)]+ is a precatalyst for oligomerization of ethylene to form initially 2-butene and subsequently linear and branched C8-C12 products from butene activation. Moreover, isomerization of 1-hexene takes place efficiently with exceptionally low catalyst loading (10 ppm) and up to 74,000 turnover numbers.
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Affiliation(s)
- James J Race
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern
| | - Luke A Hudson
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern
| | - Martin Albrecht
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern
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3
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Reusser E, Albrecht M. Electronically flexible PYA ligands for efficient palladium-catalyzed α-arylation of ketones. Dalton Trans 2023; 52:16688-16697. [PMID: 37882141 PMCID: PMC10660196 DOI: 10.1039/d3dt03182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 10/17/2023] [Indexed: 10/27/2023]
Abstract
Palladium-catalyzed cross-coupling chemistry and in particular ketone α-arylation has been relying on a rather narrow range of supporting ligands with almost no alternatives to phosphines and N-heterocyclic carbenes. Here we introduce a class of well-defined palladium(II) complexes supported by N,N'-chelating and electronically flexible pyridylidene amide (PYA)-pyridyl ligands as catalysts for efficient α-arylation of ketones. Steric and electronic variations of the N,N'-bidentate ligand indicate that the introduction of an ortho-methyl group on the pyridinum heterocycle of the PYA ligand enhances the arylation rate and prevents catalyst deactivation, reaching turnover numbers up to 7300 and turnover frequencies of almost 10 000 h-1, which is similar to that of the best phosphine complexes known to date. Introducing a shielding xylyl substituent accelerates catalysis further, however at the expense of lower selectivity towards arylated ketones. Substrate scope investigations revealed that both electron-rich and -poor aryl bromides as well as a broad range of electronically and sterically modified ketones are efficiently converted, including aliphatic ketones. Mechanistic investigations using Hammett and Eyring analyses indicated that both, oxidative addition and reductive elimination are relatively fast, presumably as a consequence of the electronic flexibility of the PYA ligand, while enolate coordination was identified as the turnover-limiting step.
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Affiliation(s)
- Esaïe Reusser
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Martin Albrecht
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
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4
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Bukvic AJ, Kesselring V, Aeschlimann M, Albrecht M. Pincer Platinum(II) Hydrides: High Stability Imparted by Donor-Flexible Pyridylidene Amide Ligands and Evidence for Adduct Formation before Protonation. Inorg Chem 2023; 62:2905-2912. [PMID: 36719961 DOI: 10.1021/acs.inorgchem.2c04363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Donor-flexible ligands are an emerging class of noninnocent ligands. Their ability to adapt their donating strength toward a metal center has had numerous catalytic advantages yet has never been utilized to stabilize and isolate intermediate complexes within these processes. We demonstrate through the use of a pincer ligand containing two donor-flexible pyridylidene amide (PYA) arms in coordination with platinum(II) that this ligand adaptability revealed remarkably stable hydride and formate complexes. These are typically fleeting catalytic intermediates within formic acid dehydrogenation and CO2 hydrogenation catalytic cycles. The PYA platinum hydride complexes are indefinitely stable in air, while formate complexes show no sign of β-hydrogen elimination. This robustness allowed us to investigate hydride protonation as a seemingly simple reaction, though in-depth kinetic analysis reveals a pre-equilibrium step prior to platinum hydride protonation. This initial step has been attributed to adduct formation and is slower than the protonation, and therefore a relevant aspect when designing catalytic cycles for hydrogen release and its microscopic reverse, viz., hydrogen uptake.
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Affiliation(s)
- Alexander J Bukvic
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Vera Kesselring
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Michael Aeschlimann
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Martin Albrecht
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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5
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Bukvic AJ, Albrecht M. Pincer and Macrocyclic Pyridylidene Amide (PYA) Au III Complexes. Inorg Chem 2022; 61:14038-14045. [PMID: 35994319 DOI: 10.1021/acs.inorgchem.2c02030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Gold-based homogeneous catalysis is dominated by redox neutral AuI systems. Redox-active gold-based catalysts are less common, principally because of redox cycles between AuI and AuIII being hampered by unfavorable potentials. We report gold(III) complexes containing pincer-based, donor-flexible pyridylidene amide (PYA) ligands to address these issues. These complexes act as electron reservoirs through two limiting resonance structures consisting of either soft, imine coordination sites or harder, zwitterionic amide donors. We further alter the donor properties by using the ortho-, meta-, and para-pyridylidene amide variants of the PYA pincer arms. These bis-PYA pincer ligands exhibited a high contribution of amide coordination in the solid-state of the gold(III) complexes; however, the solution data suggests a high contribution from the neutral L-type resonance forms. This L-type contribution, primarily shown through cyclic voltammetry studies, prevents reversible gold(III) reduction and also disfavors abstraction of the ancillary chloride ligand. Furthermore, a novel macrocyclic-PYA ligand is introduced, which shows secondary metal-ligand interactions.
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Affiliation(s)
- Alexander J Bukvic
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Martin Albrecht
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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6
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Abdolla NSY, Davies DL, Singh K. Bis‐Cyclometallated Iridium(III) Complexes with Bidentate Ligands Containing One or Two Pyridylideneamine (PYE) Donors: Influence of PYE Substitution (
para
or
ortho
) on Complexation. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Noreldin S. Y. Abdolla
- School of Chemistry University of Leicester Leicester LE1 7RH UK
- Current address: Chemistry Department Faculty of Science Omar Al-Mukhtar University Tobruk Libya
| | - David L. Davies
- School of Chemistry University of Leicester Leicester LE1 7RH UK
| | - Kuldip Singh
- School of Chemistry University of Leicester Leicester LE1 7RH UK
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7
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Li J, Triana CA, Wan W, Adiyeri Saseendran DP, Zhao Y, Balaghi SE, Heidari S, Patzke GR. Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives. Chem Soc Rev 2021; 50:2444-2485. [DOI: 10.1039/d0cs00978d] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The recent synthetic and mechanistic progress in molecular and heterogeneous water oxidation catalysts highlights the new, overarching strategies for knowledge transfer and unifying design concepts.
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Affiliation(s)
- J. Li
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - C. A. Triana
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - W. Wan
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | | | - Y. Zhao
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - S. E. Balaghi
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - S. Heidari
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
| | - G. R. Patzke
- Department of Chemistry
- University of Zurich
- CH-8057 Zurich
- Switzerland
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8
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Gatto G, De Palo A, Carrasco AC, Pizarro AM, Zacchini S, Pampaloni G, Marchetti F, Macchioni A. Modulating the water oxidation catalytic activity of iridium complexes by functionalizing the Cp*-ancillary ligand: hints on the nature of the active species. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02306j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A comparative study on the behavior of a series of iridium dimeric WOCs with modified Cp* ligands reveals the key role played by the variable substituent.
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Affiliation(s)
- Giordano Gatto
- Department of Chemistry, Biology and Biotechnology and CIRCC
- University of Perugia
- 06123 Perugia
- Italy
| | - Alice De Palo
- Dipartimento di Chimica e Chimica Industriale University of Pisa
- 56124 Pisa
- Italy
| | | | | | - Stefano Zacchini
- Dipartimento di Chimica Industriale “Toso Montanari”
- Università di Bologna
- 40136 Bologna
- Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale University of Pisa
- 56124 Pisa
- Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale University of Pisa
- 56124 Pisa
- Italy
| | - Alceo Macchioni
- Department of Chemistry, Biology and Biotechnology and CIRCC
- University of Perugia
- 06123 Perugia
- Italy
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9
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Verhoeven DGA, Albrecht M. Modular O- vs. N-coordination of pyridylidene amide ligands to iron determines activity in alcohol oxidation catalysis. Dalton Trans 2020; 49:17674-17682. [PMID: 33232405 DOI: 10.1039/d0dt02818e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A family of polydentate pyridine-substituted pyridylidene amide (PYA) complexes bound to iron(ii) was developed. The variation of the coordination set from NN-bidentate PYA to tridentate pincer-type pyPYA2 systems (pyPYA2 = 2,6-bis(PYA)pyridine) had a large influence on the binding mode to iron(ii), including a change from the N- to rare O-coordination of the PYA site and a concomitant shift of the predominant ligand resonance structure. These binding mode variations invoke changes in the reactivity of the complexes, which were probed in the peroxide-mediated oxidation of 1-phenylethanol to acetophenone. A comparison with uncomplexed FeCl2 indicated that bidentate NN coordination is unstable and presumably leads to the dissociation of FeCl2. In contrast, the tridentate ligand binding is robust. Remarkably, the tridentate PYA pincer coordination inhibits catalytic activity in the NNN binding mode, while the ONO coordination greatly enhances catalytic performance. Under optimized conditions, the bis-ligated ONO pincer iron complex [Fe(pyPYA2)2][2PF6] reaches full conversion within one hour (0.5 mol% catalyst loading) and under dilute conditions turnover numbers over 20 000 (0.005 mol% catalyst loading).
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Affiliation(s)
- Dide G A Verhoeven
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
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10
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Melle P, Thiede J, Hey DA, Albrecht M. Highly Efficient Transfer Hydrogenation Catalysis with Tailored Pyridylidene Amide Pincer Ruthenium Complexes. Chemistry 2020; 26:13226-13234. [PMID: 32452600 DOI: 10.1002/chem.202001145] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/25/2020] [Indexed: 11/09/2022]
Abstract
The rational optimization of homogeneous catalysts requires ligand platforms that are easily tailored to improve catalytic performance. Here, it is demonstrated that pyridylidene amides (PYAs) provide such a platform to custom-shape transfer hydrogenation catalysts with exceptional activity. Specifically, a series of meta-PYA pincer ligands with differently substituted PYA units has been synthezised and coordinated to ruthenium(II) centres to form bench-stable tris-acetonitrile complexes [Ru(R-PYA-pincer)(MeCN)3 ](PF6 )2 (R=OMe, Me, H, Cl, CF3 ). Analytic studies including 1 H NMR spectroscopy, cyclic voltammetry, and X-ray crystallography reveal a direct influence of the substituents on the electronic properties of the ruthenium center. The complexes are active in the catalytic transfer hydrogenation of ketones, with activities directly encoded by the PYA substitution pattern. Their perfomance improves further upon exchange of an ancillary MeCN ligand with PPh3 . While complexes [Ru(R-PYA-pincer)(PPh3 )(MeCN)2 ](PF6 )2 were only isolated for R=H, Me, an in situ protocol was developed to generate these complexes in situ for R=OMe, Cl, CF3 by using a 1:2 ratio of the complexes and PPh3 . This in situ protocol together with a short catalyst pre-activation provided highly active catalytic systems. The most active pre-catalyst featured the methoxy-substituted PYA ligand and reached turnover frenquencies of 210 000 h-1 under an exceptionally low catalyst loading of 25 ppm for the benchmark substrate benzophenone, representing one of the most active transfer hydrogenation systems known to date.
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Affiliation(s)
- Philipp Melle
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Jan Thiede
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Daniela A Hey
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland.,Fakultät für Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748, Garching, Germany
| | - Martin Albrecht
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
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11
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Melle P, Ségaud N, Albrecht M. Ambidentate bonding and electrochemical implications of pincer-type pyridylidene amide ligands in complexes of nickel, cobalt and zinc. Dalton Trans 2020; 49:12662-12673. [PMID: 32959829 DOI: 10.1039/d0dt02482a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pincer-type tridentate pyridyl bis(pyridylidene amide) (pyPYA2) ligand systems were coordinated to the Earth-abundant first row transition metals nickel, cobalt and zinc. A one-pot synthesis in water/ethanol afforded octahedral homoleptic bis-PYA complexes, [M(pyPYA2)2](PF6)2, whereas five-coordinate mono-PYA dichloride complexes, [M(pyPYA2)Cl2], were obtained upon slow addition of the ligand to the metal chlorides in DMF. Electrochemical measurements further revealed a facile oxidation of the metal centers from Ni2+ to Ni4+ and Co2+ to Co3+, respectively, while the Zn2+ system was redox inactive. These experiments further allowed for quantification of the much stronger electron donor properties of neutral N,N,N-tridentate pyPYA2 pincer ligands as compared to terpy. Remarkably, ortho-PYA pincer ligands feature amide coordination to the metal center via oxygen or nitrogen. This ambidentate ligand binding constitutes another mode of donor flexibility of the PYA ligand system, complementing the resonance structure dynamics established previously. NMR spectroscopic and MS analysis reveal that the meta-PYA ligand undergoes selective deuteration when coordinated to cobalt. This reactivity suggests the potential of this ligand as a transient proton reservoir for HX bond activation and, moreover, indicates the relevance of several resonance structures and therefore supports the notion that meta-PYA ligands are mesoionic.
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Affiliation(s)
- Philipp Melle
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
| | - Nathalie Ségaud
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
| | - Martin Albrecht
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
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12
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Mazloomi Z, Margalef J, Gil-Sepulcre M, Romero N, Albrecht M, Llobet A, Sala X, Pàmies O, Diéguez M. Effect of Ligand Chelation and Sacrificial Oxidant on the Integrity of Triazole-Based Carbene Iridium Water Oxidation Catalysts. Inorg Chem 2020; 59:12337-12347. [PMID: 32813508 DOI: 10.1021/acs.inorgchem.0c01439] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the effect of replacing the pyridine group in the chelating trz Ir-water oxidation catalysts by a benzoxazole and a thiazole moiety. We have also evaluated if the presence of bidentate ligands is crucial for high activities and to avoid the decomposition into undesired heterogeneous layers. The catalytic performance of these benzoxazole/thiazole-triazolidene Ir-complexes in water oxidation was studied at variable pH using either CAN (pH = 1) or NaIO4 (pH = 5.6 and 7). Electrocatalytic experiments indicated that while CAN-mediated water oxidation led to catalyst heterogeneization irrespective of the triazolylidene substituent, periodate as sacrificial oxidant preserved a homogeneously active species. Repetitive additions of sacrificial oxidant indicates higher integrity of the Ir-complex with a thiazole-substituted triazolylidene compared to ligands featuring a benzoxazole as chelating donor or no chelating group at all. Rigid chelation of the thiazole group was also established from stability measurements under highly acidic, oxidizing, and high ionic strength conditions.
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Affiliation(s)
- Zahra Mazloomi
- Departament de Quı́mica Fı́sica i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo, 1, 43007 Tarragona, Spain
| | - Jessica Margalef
- Departament de Quı́mica Fı́sica i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo, 1, 43007 Tarragona, Spain
| | - Marcos Gil-Sepulcre
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain.,Institute of Chemical Research of Catalonia (ICIQ-BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Nuria Romero
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Martin Albrecht
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ-BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Xavier Sala
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Oscar Pàmies
- Departament de Quı́mica Fı́sica i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo, 1, 43007 Tarragona, Spain
| | - Montserrat Diéguez
- Departament de Quı́mica Fı́sica i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo, 1, 43007 Tarragona, Spain
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13
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Navarro M, Segarra C, Pfister T, Albrecht M. Structural, Electronic, and Catalytic Modulation of Chelating Pyridylideneamide Ruthenium(II) Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00205] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Miquel Navarro
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Candela Segarra
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Tim Pfister
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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14
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Salzmann K, Segarra C, Albrecht M. Donor‐Flexible Bis(pyridylidene amide) Ligands for Highly Efficient Ruthenium‐Catalyzed Olefin Oxidation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kevin Salzmann
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Candela Segarra
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
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15
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Li Q, Ren Y, Xie Q, Wu M, Feng H, Zheng L, Zhang H, Long J, Wang T. Nickel (II) tetrapyridyl complexes as electrocatalysts and precatalysts for water oxidation. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5813] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Qi‐Jun Li
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Ya‐Jie Ren
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Qin Xie
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Min Wu
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Hua‐Xing Feng
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Li‐Mei Zheng
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Hua‐Xin Zhang
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
| | - Jin‐Qiao Long
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
- College of Chemistry and Environment Engineering Baise University Baise Guangxi 533000 China
| | - Tian‐Shun Wang
- College of Chemistry and Chemical Engineering Guangxi University No. 100, Daxue East Road Nanning Guangxi 530004 China
- Research Institute of agro‐products quality safety and testing technology Guangxi Academy of Agriculture Sciences Nanning Guangxi 530007 China
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16
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Weilhard A, Salzmann K, Navarro M, Dupont J, Albrecht M, Sans V. Catalyst design for highly efficient carbon dioxide hydrogenation to formic acid under buffering conditions. J Catal 2020. [DOI: 10.1016/j.jcat.2020.02.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Salzmann K, Segarra C, Albrecht M. Donor‐Flexible Bis(pyridylidene amide) Ligands for Highly Efficient Ruthenium‐Catalyzed Olefin Oxidation. Angew Chem Int Ed Engl 2020; 59:8932-8936. [DOI: 10.1002/anie.202002014] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Kevin Salzmann
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Candela Segarra
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
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18
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Olivares M, van der Ham CJM, Mdluli V, Schmidtendorf M, Müller‐Bunz H, Verhoeven TWGM, Li M, Niemantsverdriet JW(H, Hetterscheid DGH, Bernhard S, Albrecht M. Relevance of Chemical vs. Electrochemical Oxidation of Tunable Carbene Iridium Complexes for Catalytic Water Oxidation. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000090] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Marta Olivares
- Departement für Chemie und Biochemie Universität Bern Freiestrasse 3, CH ‐3012 Bern Switzerland
- School of Chemistry University College Dublin Belfield Dublin 4 Ireland
| | | | - Velabo Mdluli
- Department of Chemistry Carnegie Mellon University 15213 Pittsburgh Pennsylvania USA
| | | | - Helge Müller‐Bunz
- School of Chemistry University College Dublin Belfield Dublin 4 Ireland
| | - Tiny W. G. M. Verhoeven
- Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Mo Li
- Department of Chemistry Carnegie Mellon University 15213 Pittsburgh Pennsylvania USA
| | | | | | - Stefan Bernhard
- Department of Chemistry Carnegie Mellon University 15213 Pittsburgh Pennsylvania USA
| | - Martin Albrecht
- Departement für Chemie und Biochemie Universität Bern Freiestrasse 3, CH ‐3012 Bern Switzerland
- School of Chemistry University College Dublin Belfield Dublin 4 Ireland
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19
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Madadkhani S, Allakhverdiev SI, Najafpour MM. An iridium-based nanocomposite prepared from an iridium complex with a hydrocarbon-based ligand. NEW J CHEM 2020. [DOI: 10.1039/d0nj02257h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
For the first time, a chlorobis(cyclooctene)iridium(i) dimer with only a simple hydrocarbon-based ligand is investigated as a heterogeneous catalyst for the oxygen-evolution reaction in the presence of cerium(iv) ammonium nitrate.
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Affiliation(s)
- Sepideh Madadkhani
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
| | - Suleyman I. Allakhverdiev
- K.A. Timiryazev Institute of Plant Physiology
- Russian Academy of Sciences
- Moscow 127276
- Russia
- Institute of Basic Biological Problems
| | - Mohammad Mahdi Najafpour
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan
- Iran
- Center of Climate Change and Global Warming
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20
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Munir N, Masood S, Liaqat F, Tahir MN, Yousuf S, Kalsoom S, Mughal EU, Sumrra SH, Maalik A, Zafar MN. Synthesis of new Pro-PYE ligands as co-catalysts toward Pd-catalyzed Heck-Mizoroki cross coupling reactions. RSC Adv 2019; 9:37986-38000. [PMID: 35541803 PMCID: PMC9075740 DOI: 10.1039/c9ra07912b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 11/07/2019] [Indexed: 11/25/2022] Open
Abstract
The present research work describes the synthesis of five new ligands containing pyridinium amine, [H2L1][OTf]2-[H2L5][I]2 from two new precursors, [P3 Et][I] and [P2 Me][CF3SO3]. The structure elucidations of the compounds were confirmed by multinuclear NMR (1H, 13C), FT-IR and by single crystal XRD techniques. Theoretical DFT studies were carried out to get better insight into the electronic levels and structural features of all the molecules. These synthesized new Pro-PYE ligands [H2L1][OTf]2-[H2L5][I]2 were found to be significantly active as co-catalysts for Pd(CH3CO2)2 toward Heck-Mizoroki coupling reactions with wide substrate scope in the order of [H2L1][OTf]2 ≫ [H2L2][OTf]2 > [H2L3][OTf]2 > [H2L4][OTf]2 > [H2L5][I]2.
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Affiliation(s)
- Naima Munir
- Department of Chemistry, Quaid-i-Azam University Islamabad-45320 Pakistan +923314503061
| | - Sara Masood
- Department of Chemistry, Quaid-i-Azam University Islamabad-45320 Pakistan +923314503061
| | - Faroha Liaqat
- Department of Chemistry, Quaid-i-Azam University Islamabad-45320 Pakistan +923314503061
| | | | - Sammer Yousuf
- H. E. J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi 75270 Pakistan
| | - Saima Kalsoom
- Centre for Interdisciplinary Research in Basic Sciences (CIRBS), International Islamic University Islamabad Pakistan
| | | | | | - Aneela Maalik
- Department of Chemistry, COMSATS University Islamabad, Islamabad Campus Park Road Islamabad-45550 Pakistan +923335490834
| | - Muhammad Naveed Zafar
- Department of Chemistry, Quaid-i-Azam University Islamabad-45320 Pakistan +923314503061
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21
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Zafar MN, Perveen F, Naz A, Mughal EU, Gul-e-Saba, Hina K. Synthesis, Characterization, and Catalytic Activity of Heteroleptic Rhodium Complex for C–N Couplings. RUSS J COORD CHEM+ 2019. [DOI: 10.1134/s1070328419010135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Puerta-Oteo R, Jiménez MV, Pérez-Torrente JJ. Molecular water oxidation catalysis by zwitterionic carboxylate bridge-functionalized bis-NHC iridium complexes. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02306a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Carboxylate functionalized bis-NHC ligands allow for the stabilization of high-valent iridium intermediate species involved in homogeneous water oxidation catalysis.
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Affiliation(s)
- Raquel Puerta-Oteo
- Department of Inorganic Chemistry
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH-CSIC)
- University of Zaragoza-CSIC
- Facultad de Ciencias
- 50009 Zaragoza
| | - M. Victoria Jiménez
- Department of Inorganic Chemistry
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH-CSIC)
- University of Zaragoza-CSIC
- Facultad de Ciencias
- 50009 Zaragoza
| | - Jesús J. Pérez-Torrente
- Department of Inorganic Chemistry
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH-CSIC)
- University of Zaragoza-CSIC
- Facultad de Ciencias
- 50009 Zaragoza
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23
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Navarro M, Rosar V, Montini T, Milani B, Albrecht M. Olefin Dimerization and Isomerization Catalyzed by Pyridylidene Amide Palladium Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00422] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Miquel Navarro
- Department für Chemie und Biochemie, Universität Bern, CH−3012 Bern, Switzerland
| | - Vera Rosar
- Department für Chemie und Biochemie, Universität Bern, CH−3012 Bern, Switzerland
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, via Licio Giorgieri 1, 34127 Trieste, Italy
| | - Tiziano Montini
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, via Licio Giorgieri 1, 34127 Trieste, Italy
| | - Barbara Milani
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, via Licio Giorgieri 1, 34127 Trieste, Italy
| | - Martin Albrecht
- Department für Chemie und Biochemie, Universität Bern, CH−3012 Bern, Switzerland
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24
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Melle P, Manoharan Y, Albrecht M. Modular Pincer-type Pyridylidene Amide Ruthenium(II) Complexes for Efficient Transfer Hydrogenation Catalysis. Inorg Chem 2018; 57:11761-11774. [DOI: 10.1021/acs.inorgchem.8b01895] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Philipp Melle
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Yanisha Manoharan
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Martin Albrecht
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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25
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Navarro M, Smith CA, Li M, Bernhard S, Albrecht M. Optimization of Synthetically Versatile Pyridylidene Amide Ligands for Efficient Iridium‐Catalyzed Water Oxidation. Chemistry 2018; 24:6386-6398. [DOI: 10.1002/chem.201705619] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Miquel Navarro
- Department of Chemistry & Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
| | - Christene A. Smith
- Department of Chemistry & Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
- Permanent address: Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario Canada
| | - Mo Li
- Department of Chemistry Carnegie Mellon University 4400 Fifth Avenue Pittsburgh PA 15213 USA
| | - Stefan Bernhard
- Department of Chemistry Carnegie Mellon University 4400 Fifth Avenue Pittsburgh PA 15213 USA
| | - Martin Albrecht
- Department of Chemistry & Biochemistry University of Bern Freiestrasse 3 3012 Bern Switzerland
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26
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Navarro M, Li M, Bernhard S, Albrecht M. A mesoionic nitrogen-donor ligand: structure, iridium coordination, and catalytic effects. Dalton Trans 2018; 47:659-662. [PMID: 29239436 DOI: 10.1039/c7dt04555g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A first example of a mesoionic ligand with a nitrogen coordination site was prepared by a simple and robust synthesis and is shown to have excellent properties for promoting iridium-catalyzed water oxidation.
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Affiliation(s)
- Miquel Navarro
- Department of Chemistry & Biochemistry
- University of Bern
- CH-3012 Bern
- Switzerland
| | - Mo Li
- Department of Chemistry
- Carnegie Mellon University
- Pittsburgh
- USA
| | - Stefan Bernhard
- Department of Chemistry
- Carnegie Mellon University
- Pittsburgh
- USA
| | - Martin Albrecht
- Department of Chemistry & Biochemistry
- University of Bern
- CH-3012 Bern
- Switzerland
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27
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Mahanti B, González Miera G, Martínez-Castro E, Bedin M, Martín-Matute B, Ott S, Thapper A. Homogeneous Water Oxidation by Half-Sandwich Iridium(III) N-Heterocyclic Carbene Complexes with Pendant Hydroxy and Amino Groups. CHEMSUSCHEM 2017; 10:4616-4623. [PMID: 28885785 DOI: 10.1002/cssc.201701370] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 08/31/2017] [Indexed: 06/07/2023]
Abstract
Herein, we report three IrIII Cp* complexes with hydroxy- or amino-functionalized N-heterocyclic carbene (NHC) ligands that catalyze efficient water oxidation induced by addition of ceric ammonium nitrate (CAN). The pendant hydroxy or amino groups are very important for activity, and the complexes with heteroatom-functionalized NHC ligands show up to 15 times higher rates of oxygen evolution in CAN-induced water oxidation than a reference IrIII Cp* complex without heteroatom functionalization. The formation of molecular high-valent Ir intermediates that are presumably involved in the rate-determining step for water oxidation is established by UV/Vis spectroscopy and ESI-MS under turnover conditions. The hydroxy groups on the NHC ligands, as well as chloride ligands on the iridium center are proposed to structurally stabilize the high-valent species, and thereby improve the catalytic activity. The IrIII complex with a hydroxy-functionalized NHC shows the highest catalytic activity with a TON of 2500 obtained in 3 h and with >90 % yield relative to the amount of oxidant used.
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Affiliation(s)
- Bani Mahanti
- Department of Chemistry, Ångström Laboratory, Uppsala University, P.O. Box 523, 75120, Uppsala, Sweden
| | - Greco González Miera
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Elisa Martínez-Castro
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Michele Bedin
- Department of Chemistry, Ångström Laboratory, Uppsala University, P.O. Box 523, 75120, Uppsala, Sweden
| | - Belén Martín-Matute
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Sascha Ott
- Department of Chemistry, Ångström Laboratory, Uppsala University, P.O. Box 523, 75120, Uppsala, Sweden
| | - Anders Thapper
- Department of Chemistry, Ångström Laboratory, Uppsala University, P.O. Box 523, 75120, Uppsala, Sweden
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28
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Navarro M, Smith CA, Albrecht M. Enhanced Catalytic Activity of Iridium(III) Complexes by Facile Modification of C,N-Bidentate Chelating Pyridylideneamide Ligands. Inorg Chem 2017; 56:11688-11701. [PMID: 28898071 DOI: 10.1021/acs.inorgchem.7b01654] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A set of aryl-substituted pyridylideneamide (PYA) ligands with variable donor properties owing to a pronounced zwitterionic and a neutral diene-type resonance structure were used as electronically flexible ligands at a pentamethylcyclopentadienyl (Cp*) iridium center. The straightforward synthesis of this type of ligand allows for an easy incorporation of donor substituents such as methoxy groups in different positions of the phenyl ring of the C,N-bidentate chelating PYA. These modifications considerably enhance the catalytic activity of the coordinated iridium center toward the catalytic aerobic transfer hydrogenation of carbonyls and imines as well as the hydrosilylation of phenylacetylene. Moreover, these PYA iridium complexes catalyze the base-free transfer hydrogenation of aldehydes, and to a lesser extent also of ketones. Under standard transfer hydrogenation conditions including base, aldehydes are rapidly oxidized to carboxylic acids rather than reduced to the corresponding alcohol, as is observed under base-free conditions.
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Affiliation(s)
- Miquel Navarro
- Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Christene A Smith
- Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Martin Albrecht
- Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, CH-3012 Bern, Switzerland
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29
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Su W, Zhou K, Cai F, Chen C, Mousavi B, Chaemchuen S, Verpoort F. Water Oxidation by In Situ Generated [RuII
(OH2
)(NC
NHC
O)(pic)2
]+. Chem Asian J 2017; 12:2304-2310. [DOI: 10.1002/asia.201700837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/03/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Wei Su
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Kui Zhou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Fanglin Cai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Bibimaryam Mousavi
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Somboon Chaemchuen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
| | - Francis Verpoort
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
- National Research Tomsk Polytechnic University; Lenin Avenue 30 634050 Tomsk Russian Federation
- Ghent University; Global Campus Songdo, Ywonsu-Gu; Incheon Republic of Korea
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30
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Sinha SB, Shopov DY, Sharninghausen LS, Stein CJ, Mercado BQ, Balcells D, Pedersen TB, Reiher M, Brudvig GW, Crabtree RH. Redox Activity of Oxo-Bridged Iridium Dimers in an N,O-Donor Environment: Characterization of Remarkably Stable Ir(IV,V) Complexes. J Am Chem Soc 2017. [PMID: 28648068 DOI: 10.1021/jacs.7b04874] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Chemical and electrochemical oxidation or reduction of our recently reported Ir(IV,IV) mono-μ-oxo dimers results in the formation of fully characterized Ir(IV,V) and Ir(III,III) complexes. The Ir(IV,V) dimers are unprecedented and exhibit remarkable stability under ambient conditions. This stability and modest reduction potential of 0.99 V vs NHE is in part attributed to complete charge delocalization across both Ir centers. Trends in crystallographic bond lengths and angles shed light on the structural changes accompanying oxidation and reduction. The similarity of these mono-μ-oxo dimers to our Ir "blue solution" water-oxidation catalyst gives insight into potential reactive intermediates of this structurally elusive catalyst. Additionally, a highly reactive material, proposed to be a Ir(V,V) μ-oxo species, is formed on electrochemical oxidation of the Ir(IV,V) complex in organic solvents at 1.9 V vs NHE. Spectroelectrochemistry shows reversible conversion between the Ir(IV,V) and proposed Ir(V,V) species without any degradation, highlighting the exceptional oxidation resistance of the 2-(2-pyridinyl)-2-propanolate (pyalk) ligand and robustness of these dimers. The Ir(III,III), Ir(IV,IV) and Ir(IV,V) redox states have been computationally studied both with DFT and multiconfigurational calculations. The calculations support the stability of these complexes and provide further insight into their electronic structures.
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Affiliation(s)
- Shashi Bhushan Sinha
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Dimitar Y Shopov
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Liam S Sharninghausen
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Christopher J Stein
- Laboratorium für Physikalische Chemie, ETH Zürich , Vladimir-Prelog Weg 2, 8093 Zürich, Switzerland
| | - Brandon Q Mercado
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - David Balcells
- Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo, Norway
| | - Thomas Bondo Pedersen
- Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo, Norway
| | - Markus Reiher
- Laboratorium für Physikalische Chemie, ETH Zürich , Vladimir-Prelog Weg 2, 8093 Zürich, Switzerland
| | - Gary W Brudvig
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Robert H Crabtree
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States
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31
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Li M, Bernhard S. Synthetically tunable iridium(III) bis-pyridine-2-sulfonamide complexes as efficient and durable water oxidation catalysts. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.11.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Drebushchak TN, Kryukov Y, Rogova AI, Boldyreva EV. Crystal structure of 4-benzyl-carbamoyl-1-methyl-pyridin-1-ium iodide: an efficient multimodal anti-viral drug. Acta Crystallogr E Crystallogr Commun 2017; 73:967-970. [PMID: 28775862 PMCID: PMC5499270 DOI: 10.1107/s2056989017008155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 06/01/2017] [Indexed: 11/10/2022]
Abstract
In the title compound, [MeC5H4NCONHCH2C6H5]I or C14H15N2O+·I-, a cation and an anion form an ionic pair linked by a strong N-H⋯I hydrogen bond. In the crystal, ionic pairs linked by weak C-H⋯I hydrogen bonds form infinite ribbons along the crystallographic a axis. Polymorphism screening varying crystallization solvents (water, acetone 90%-water, ethanol 90%-water, 2-propanol 90%-water, DMF, DMSO, methanol, aceto-nitrile) and conditions (solution temperature, heating and cooling protocols) did not reveal any other polymorphs than the one reported in this work.
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Affiliation(s)
- T. N. Drebushchak
- Institute of Solid State Chemistry and Mechanochemistry, SB RAS, ul. Kutateladze 18, Novosibirsk 630128, Russian Federation
- Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090, Russian Federation
| | - Yu.A. Kryukov
- Institute for the Problems of the Technology of Energetic Materials, SB RAS, ul. Socialisticheskaia 1, Biisk 659322, Russian Federation
| | - A. I. Rogova
- Institute for the Problems of the Technology of Energetic Materials, SB RAS, ul. Socialisticheskaia 1, Biisk 659322, Russian Federation
| | - E. V. Boldyreva
- Institute of Solid State Chemistry and Mechanochemistry, SB RAS, ul. Kutateladze 18, Novosibirsk 630128, Russian Federation
- Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090, Russian Federation
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33
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Younus HA, Ahmad N, Chughtai AH, Vandichel M, Busch M, Van Hecke K, Yusubov M, Song S, Verpoort F. A Robust Molecular Catalyst Generated In Situ for Photo- and Electrochemical Water Oxidation. CHEMSUSCHEM 2017; 10:862-875. [PMID: 27921384 DOI: 10.1002/cssc.201601477] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 11/22/2016] [Indexed: 06/06/2023]
Abstract
Water splitting is the key step towards artificial photosystems for solar energy conversion and storage in the form of chemical bonding. The oxidation of water is the bottle-neck of this process that hampers its practical utility; hence, efficient, robust, and easy to make catalytic systems based on cheap and earth-abundant materials are of exceptional importance. Herein, an in situ generated cobalt catalyst, [CoII (TCA)2 (H2 O)2 ] (TCA=1-mesityl-1,2,3-1H-triazole-4-carboxylate), that efficiently conducts photochemical water oxidation under near-neutral conditions is presented. The catalyst showed high stability under photolytic conditions for more than 3 h of photoirradiation. During electrochemical water oxidation, the catalytic system assembled a catalyst film, which proved not to be cobalt oxide/hydroxide as normally expected, but instead, and for the first time, generated a molecular cobalt complex that incorporated the organic ligand bound to cobalt ions. The catalyst film exhibited a low overpotential for electrocatalytic water oxidation (360 mV) and high oxygen evolution peak current densities of 9 and 2.7 mA cm-2 on glassy carbon and indium-doped tin oxide electrodes, respectively, at only 1.49 and 1.39 V (versus a normal hydrogen electrode), respectively, under neutral conditions. This finding, exemplified on the in situ generated cobalt complex, might be applicable to other molecular systems and suggests that the formation of a catalytic film in electrochemical water oxidation experiments is not always an indication of catalyst decomposition and the formation of nanoparticles.
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Affiliation(s)
- Hussein A Younus
- State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P.R. China
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China
- National Research Tomsk Polytechnic University, Lenin Avenue 30, Tomsk, 634050, Russia
- Chemistry Department, Faculty of Science, Fayoum University, Fayoum, 36514, Egypt
| | - Nazir Ahmad
- State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P.R. China
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China
- National Research Tomsk Polytechnic University, Lenin Avenue 30, Tomsk, 634050, Russia
| | - Adeel H Chughtai
- State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P.R. China
| | - Matthias Vandichel
- Center for Molecular Modeling, Ghent University, Technology Park 903, 9052, Zwijnaarde, Belgium
- Department of Physics and Competence Center for Catalysis, Chalmers University of Technology, Fysikgränd 3, Göteborg, Sweden
| | - Michael Busch
- Department of Physics and Competence Center for Catalysis, Chalmers University of Technology, Fysikgränd 3, Göteborg, Sweden
| | - Kristof Van Hecke
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000, Ghent, Belgium
| | - Mekhman Yusubov
- National Research Tomsk Polytechnic University, Lenin Avenue 30, Tomsk, 634050, Russia
| | - Shaoxian Song
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China
| | - Francis Verpoort
- State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P.R. China
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China
- National Research Tomsk Polytechnic University, Lenin Avenue 30, Tomsk, 634050, Russia
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000, Ghent, Belgium
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34
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Abdel‐Magied AF, Arafa WAA, Laine TM, Shatskiy A, Kärkäs MD, Åkermark B, Johnston EV. Substituent Effects in Molecular Ruthenium Water Oxidation Catalysts Based on Amide Ligands. ChemCatChem 2017. [DOI: 10.1002/cctc.201601382] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ahmed F. Abdel‐Magied
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
| | - Wael A. A. Arafa
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
- Current address: Chemistry Department, Faculty of ScienceFayoum University P.O. Box 63514 Fayoum Egypt
| | - Tanja M. Laine
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
| | - Andrey Shatskiy
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
| | - Markus D. Kärkäs
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
| | - Björn Åkermark
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
| | - Eric V. Johnston
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University SE-106 91 Stockholm Sweden
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35
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Su W, Younus HA, Zhou K, Khattak ZAK, Chaemcheun S, Chen C, Verpoort F. Chemical and photochemical water oxidation catalyzed by novel ruthenium complexes comprising a negatively charged NCNHCO ligand. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02333a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Pincer-type ruthenium complexes incorporating an asymmetric negatively charged imidazolylidene were prepared and capable to oxidize water chemically and photo-chemically with high stability.
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Affiliation(s)
- Wei Su
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Hussein A. Younus
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Kui Zhou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Zafar A. K. Khattak
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Somboon Chaemcheun
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Francis Verpoort
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
- National Research Tomsk Polytechnic University
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36
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Drover MW, Love JA, Schafer LL. 1,3-N,O-Complexes of late transition metals. Ligands with flexible bonding modes and reaction profiles. Chem Soc Rev 2017; 46:2913-2940. [DOI: 10.1039/c6cs00715e] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
1,3-N,O-Chelating ligands are ubiquitous in nature owing to their occurrence as α-chiral amino acids in metalloproteins.
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Affiliation(s)
- Marcus W. Drover
- Department of Chemistry
- The University of British Columbia Vancouver
- Canada
| | - Jennifer A. Love
- Department of Chemistry
- The University of British Columbia Vancouver
- Canada
| | - Laurel L. Schafer
- Department of Chemistry
- The University of British Columbia Vancouver
- Canada
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37
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Li J, Güttinger R, Moré R, Song F, Wan W, Patzke GR. Frontiers of water oxidation: the quest for true catalysts. Chem Soc Rev 2017; 46:6124-6147. [DOI: 10.1039/c7cs00306d] [Citation(s) in RCA: 178] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Development of advanced analytical techniques is essential for the identification of water oxidation catalysts together with mechanistic studies.
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Affiliation(s)
- J. Li
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - R. Güttinger
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - R. Moré
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - F. Song
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - W. Wan
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
| | - G. R. Patzke
- University of Zurich
- Department of Chemistry
- CH-8057 Zurich
- Switzerland
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38
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Abdel‐Magied AF, Shatskiy A, Liao R, Laine TM, Arafa WAA, Siegbahn PEM, Kärkäs MD, Åkermark B, Johnston EV. Chemical and Photochemical Water Oxidation Mediated by an Efficient Single-Site Ruthenium Catalyst. CHEMSUSCHEM 2016; 9:3448-3456. [PMID: 27966290 PMCID: PMC6680270 DOI: 10.1002/cssc.201601171] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Indexed: 06/06/2023]
Abstract
Water oxidation is a fundamental step in artificial photosynthesis for solar fuels production. In this study, we report a single-site Ru-based water oxidation catalyst, housing a dicarboxylate-benzimidazole ligand, that mediates both chemical and light-driven oxidation of water efficiently under neutral conditions. The importance of the incorporation of the negatively charged ligand framework is manifested in the low redox potentials of the developed complex, which allows water oxidation to be driven by the mild one-electron oxidant [Ru(bpy)3 ]3+ (bpy=2,2'-bipyridine). Furthermore, combined experimental and DFT studies provide insight into the mechanistic details of the catalytic cycle.
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Affiliation(s)
- Ahmed F. Abdel‐Magied
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Andrey Shatskiy
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Rong‐Zhen Liao
- Key Laboratory for Large-Format Battery Materials and SystemMinistry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074P.R. China
| | - Tanja M. Laine
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Wael A. A. Arafa
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
- Chemistry Department, Faculty of ScienceFayoum UniversityPO Box 63514FayoumEgypt
| | - Per E. M. Siegbahn
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Markus D. Kärkäs
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Björn Åkermark
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
| | - Eric V. Johnston
- Department of Organic Chemistry, Arrhenius LaboratoryStockholm University106 91StockholmSweden
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39
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Abril P, del Rı́o MP, Tejel C, Verhoeven TWGM, Niemantsverdriet JWH, Van der Ham CJM, Kottrup KG, Hetterscheid DGH. Detangling Catalyst Modification Reactions from the Oxygen Evolution Reaction by Online Mass Spectrometry. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02800] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paula Abril
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - M. Pilar del Rı́o
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Cristina Tejel
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Tiny W. G. M. Verhoeven
- Department
of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | | | | | - Konstantin G. Kottrup
- Leiden
Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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40
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Pastori G, Wahab K, Bucci A, Bellachioma G, Zuccaccia C, Llorca J, Idriss H, Macchioni A. Heterogenized Water Oxidation Catalysts Prepared by Immobilizing Kläui-Type Organometallic Precursors. Chemistry 2016; 22:13459-63. [DOI: 10.1002/chem.201602008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Gabriele Pastori
- Department of Chemistry, Biology and Biotechnology and CIRCC; University of Perugia; Via Elce di Sotto 8 06123 Perugia Italy
| | - Khaja Wahab
- Corporate Research and Development (CRD) Centre at SABIC-KAUST P.O. Box 4545-4700; Thuwal 23955 Saudi Arabia
| | - Alberto Bucci
- Department of Chemistry, Biology and Biotechnology and CIRCC; University of Perugia; Via Elce di Sotto 8 06123 Perugia Italy
| | - Gianfranco Bellachioma
- Department of Chemistry, Biology and Biotechnology and CIRCC; University of Perugia; Via Elce di Sotto 8 06123 Perugia Italy
| | - Cristiano Zuccaccia
- Department of Chemistry, Biology and Biotechnology and CIRCC; University of Perugia; Via Elce di Sotto 8 06123 Perugia Italy
| | - Jordi Llorca
- Institute of Energy Technologies and Centre for Research in Nanoengineering; Universitat Politècnica de Catalunya; Diagonal 647 08028 Barcelona Spain
| | - Hicham Idriss
- Corporate Research and Development (CRD) Centre at SABIC-KAUST P.O. Box 4545-4700; Thuwal 23955 Saudi Arabia
| | - Alceo Macchioni
- Department of Chemistry, Biology and Biotechnology and CIRCC; University of Perugia; Via Elce di Sotto 8 06123 Perugia Italy
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