1
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Agarwal T, Kaur‐Ghumaan S. [FeFe] Hydrogenase: 2‐Propanethiolato‐Bridged {FeFe} Systems as Electrocatalysts for Hydrogen Production in Acetonitrile‐Water. Eur J Inorg Chem 2023. [DOI: 10.1002/ejic.202200623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- Tashika Agarwal
- Department of Chemistry University of Delhi Delhi 110007 India
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2
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Biancalana L, Kubeil M, Schoch S, Zacchini S, Marchetti F. Switching on Cytotoxicity of Water-Soluble Diiron Organometallics by UV Irradiation. Inorg Chem 2022; 61:7897-7909. [PMID: 35537207 PMCID: PMC9951222 DOI: 10.1021/acs.inorgchem.2c00504] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The diiron compounds [Fe2Cp2(CO)2(μ-CO)(μ-CSEt)]CF3SO3, [1]CF3SO3, K[Fe2Cp2(CO)3(CNCH2CO2)], K[2], [Fe2Cp2(CO)2(μ-CO)(μ-CNMe2)]NO3, [3]NO3, [Fe2Cp2(CO)2(PTA){μ-CNMe(Xyl)}]CF3SO3, [4]CF3SO3, and [Fe2Cp2(CO)(μ-CO){μ-η:1η3-C(4-C6H4CO2H)CHCNMe2}]CF3SO3, [5]CF3SO3, containing a bridging carbyne, isocyanoacetate, or vinyliminium ligand, were investigated for their photoinduced cytotoxicity. Specifically, the novel water-soluble compounds K[2], [3]NO3, and [4]CF3SO3 were synthesized and characterized by elemental analysis and IR and multinuclear NMR spectroscopy. Stereochemical aspects concerning [4]CF3SO3 were elucidated by 1H NOESY NMR and single-crystal X-ray diffraction. Cell proliferation studies on human skin cancer (A431) and nontumoral embryonic kidney (HEK293) cells, with and without a 10-min exposure to low-power UV light (350 nm), highlighted the performance of the aminocarbyne [3]NO3, nicknamed NIRAC (Nitrate-Iron-Aminocarbyne), which is substantially nontoxic in the dark but shows a marked photoinduced cytotoxicity. Spectroscopic (IR, UV-vis, NMR) measurements and the myoglobin assay indicated that the release of one carbon monoxide ligand represents the first step of the photoactivation process of NIRAC, followed by an extensive disassembly of the organometallic scaffold.
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Affiliation(s)
- Lorenzo Biancalana
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy,
| | - Manja Kubeil
- Institute
of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Silvia Schoch
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Stefano Zacchini
- Department
of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Fabio Marchetti
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
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3
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Mahmoud AG, Guedes da Silva MFC, Pombeiro AJ. 3,7-Diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane (DAPTA) and derivatives: Coordination chemistry and applications. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213614] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Kleinhaus JT, Wittkamp F, Yadav S, Siegmund D, Apfel UP. [FeFe]-Hydrogenases: maturation and reactivity of enzymatic systems and overview of biomimetic models. Chem Soc Rev 2021; 50:1668-1784. [DOI: 10.1039/d0cs01089h] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
[FeFe]-hydrogenases recieved increasing interest in the last decades. This review summarises important findings regarding their enzymatic reactivity as well as inorganic models applied as electro- and photochemical catalysts.
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Affiliation(s)
| | | | - Shanika Yadav
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
| | - Daniel Siegmund
- Department of Electrosynthesis
- Fraunhofer UMSICHT
- 46047 Oberhausen
- Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
- Department of Electrosynthesis
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5
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Agonigi G, Biancalana L, Lupo MG, Montopoli M, Ferri N, Zacchini S, Binacchi F, Biver T, Campanella B, Pampaloni G, Zanotti V, Marchetti F. Exploring the Anticancer Potential of Diiron Bis-cyclopentadienyl Complexes with Bridging Hydrocarbyl Ligands: Behavior in Aqueous Media and In Vitro Cytotoxicity. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00681] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Gabriele Agonigi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
| | - Lorenzo Biancalana
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
| | - Maria Giovanna Lupo
- Dipartimento di Scienze del Farmaco, Università degli Studi di Padova, Via Marzolo 5, 35131 Padova, Italy
| | - Monica Montopoli
- Dipartimento di Scienze del Farmaco, Università degli Studi di Padova, Via Marzolo 5, 35131 Padova, Italy
| | - Nicola Ferri
- Dipartimento di Scienze del Farmaco, Università degli Studi di Padova, Via Marzolo 5, 35131 Padova, Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Francesca Binacchi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
| | - Tarita Biver
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 6, I-56126 Pisa, Italy
| | - Beatrice Campanella
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche, Via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
| | - Valerio Zanotti
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy
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6
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Gao S, Liu Y, Shao Y, Jiang D, Duan Q. Iron carbonyl compounds with aromatic dithiolate bridges as organometallic mimics of [FeFe] hydrogenases. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213081] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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7
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Yan L, Hu MY, Mu C, Li A, Liu XF, Zhao PH, Li YL, Jiang ZQ, Wu HK. Synthesis, characterization, and electrochemistry of five diiron propane-1,3-dithiolate complexes with substituted phosphine ligands. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1672048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Lin Yan
- School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo, China
| | - Meng-Yuan Hu
- School of Materials Science and Engineering, North University of China, Taiyuan, China
| | - Chao Mu
- College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, China
| | - Ao Li
- College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, China
| | - Xu-Feng Liu
- School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo, China
| | - Pei-Hua Zhao
- School of Materials Science and Engineering, North University of China, Taiyuan, China
| | - Yu-Long Li
- College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, China
| | - Zhong-Qing Jiang
- Department of Physics, Key Laboratory of ATMMT Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hong-Ke Wu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China
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8
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Zaffaroni R, Dzik WI, Detz RJ, van der Vlugt JI, Reek JNH. Proton Relay Effects in Pyridyl‐Appended Hydrogenase Mimics for Proton Reduction Catalysis. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900072] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Riccardo Zaffaroni
- van 't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Wojciech I. Dzik
- van 't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Remko J. Detz
- van 't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
- ECN.TNO Energy Transition Studies Radarweg 60 1043 NT Amsterdam The Netherlands
| | - Jarl Ivar van der Vlugt
- van 't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Joost N. H. Reek
- van 't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
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9
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Tagliapietra M, Squarcina A, Hickey N, De Zorzi R, Geremia S, Sartorel A, Bonchio M. Hydrogen Evolution by Fe III Molecular Electrocatalysts Interconverting between Mono and Di-Nuclear Structures in Aqueous Phase. CHEMSUSCHEM 2017; 10:4430-4435. [PMID: 29096041 DOI: 10.1002/cssc.201701612] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/07/2017] [Indexed: 06/07/2023]
Abstract
A new FeL/Fe2 L2 manifold, with HL=2-({[di(2-pyridyl)methyl](methyl)amino}methyl)phenol, was prepared in gram scale (>50 % yield) and characterized in solution and solid state. The monomer/dimer interconversion is controlled in aqueous phase, upon varying the pH conditions. The electrocatalytic hydrogen evolution reaction (HER) occurs through the FeL monomer with added trifluoroacetic acid (TFA) and through the Fe2 L2 μ-oxo dimer in acetate buffer (pH 4.9), with an overpotential of about 1 V and faradaic yield up to 75 %. The resulting icat /ip values in the range 15-28 are among the highest reported for Fe-based electrocatalysts (icat is the catalytic current, whereas ip is the current of an Fe-based redox event).
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Affiliation(s)
- Mirko Tagliapietra
- Department of Chemical Sciences, ITM-CNR University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Andrea Squarcina
- Department of Chemical Sciences, ITM-CNR University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Neal Hickey
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Rita De Zorzi
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Silvano Geremia
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Andrea Sartorel
- Department of Chemical Sciences, ITM-CNR University of Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Marcella Bonchio
- Department of Chemical Sciences, ITM-CNR University of Padova, Via Marzolo 1, 35131, Padova, Italy
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10
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Abul-Futouh H, Almazahreh LR, Harb MK, Görls H, El-Khateeb M, Weigand W. [FeFe]-Hydrogenase H-Cluster Mimics with Various -S(CH 2) nS- Linker Lengths (n = 2-8): A Systematic Study. Inorg Chem 2017; 56:10437-10451. [PMID: 28809489 DOI: 10.1021/acs.inorgchem.7b01398] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of the nature of the dithiolato ligand on the physical and electrochemical properties of synthetic H-cluster mimics of the [FeFe]-hydrogenase is still of significant concern. In this report we describe the cyclization of various alkanedithiols to afford cyclic disulfide, tetrasulfide, and hexasulfide compounds. The latter compounds were used as proligands for the synthesis of a series of [FeFe]-hydrogenase H-cluster mimics having the general formulas [Fe2(CO)6{μ-S(CH2)nS}] (n = 4-8), [Fe2(CO)6{μ-S(CH2)nS}]2 (n = 6-8), and [Fe2(CO)6{(μ-S(CH2)nS)2}] (n = 6-8). The resulting complexes were characterized by 1H and 13C{1H} NMR and IR spectroscopic techniques, mass spectrometry, and elemental analysis as well as X-ray analysis. The purpose of this research was to study the influence of the systematic increase of n from 2 to 7 on the redox potentials of the models and the catalytic ability in the presence of acetic acid (AcOH) by applying cyclic voltammetry.
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Affiliation(s)
- Hassan Abul-Futouh
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena , Humboldt Str. 8, 07743 Jena, Germany
| | - Laith R Almazahreh
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena , Humboldt Str. 8, 07743 Jena, Germany.,ERCOSPLAN Ingenieurbüro Anlagentechnik GmbH , Arnstädter Straße 28, 99096 Erfurt, Germany
| | - Mohammad Kamal Harb
- Department of Pharmacy, Al-Zytoonah University of Jordan , P.O. Box 130, Amman 11733, Jordan
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena , Humboldt Str. 8, 07743 Jena, Germany
| | - Mohammad El-Khateeb
- Chemistry Department, Jordan University of Science and Technology , Irbid 22110, Jordan
| | - Wolfgang Weigand
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena , Humboldt Str. 8, 07743 Jena, Germany
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11
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Natarajan M, Faujdar H, Mobin SM, Stein M, Kaur-Ghumaan S. A mononuclear iron carbonyl complex [Fe(μ-bdt)(CO) 2(PTA) 2] with bulky phosphine ligands: a model for the [FeFe] hydrogenase enzyme active site with an inverted redox potential. Dalton Trans 2017; 46:10050-10056. [PMID: 28731078 DOI: 10.1039/c7dt01994g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mononuclear hexa-coordinated iron carbonyl complex [Fe(μ-bdt)(CO)2(PTA)2] 1 (bdt = 1,2-benzenedithiolate; PTA = 1,3,5-triaza-7-phosphaadamantane) with two bulky phosphine ligands in the trans position was synthesized and characterized by X-ray structural analysis coulometry data, FTIR, electrochemistry and electronic structure calculations. The complex undergoes a facilitated two-electron reduction 1/12- and shows an inverted one-electron reduction for 1/1- at higher potentials. Electrochemical investigations of 1 are compared to the closely related [Fe(bdt)(CO)2(PMe3)2] compound. A mechanistic suggestion for the hydrogen evolution reaction upon proton reduction from acid media is derived. The stability of 1 in both weak and strong acids is monitored by cyclic voltammetry.
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Affiliation(s)
- M Natarajan
- Department of Chemistry, University of Delhi, Delhi 110007, India.
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12
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Abul-Futouh H, El-khateeb M, Görls H, Asali KJ, Weigand W. Selenium makes the difference: protonation of [FeFe]-hydrogenase mimics with diselenolato ligands. Dalton Trans 2017; 46:2937-2947. [DOI: 10.1039/c7dt00057j] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthetic models of the active site of an [FeFe]-hydrogenase containing a Sn atom in the bridgehead of the diselenato ligand, namely [Fe2(CO)6{μ-(SeCH2Se)SnMe2}],3and [Fe2(CO)6{μ-(SeCH2)2SnMe2}],4have been synthesized and characterized by spectroscopic methods.
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Affiliation(s)
- Hassan Abul-Futouh
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Mohammad El-khateeb
- Chemistry Department
- Jordan University of Science and Technology
- Irbid 22110
- Jordan
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Khalil Jamil Asali
- Chemistry Department
- Jordan University of Science and Technology
- Irbid 22110
- Jordan
| | - Wolfgang Weigand
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
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13
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Abul-Futouh H, Almazahreh LR, Sakamoto T, Stessman NYT, Lichtenberger DL, Glass RS, Görls H, El-Khateeb M, Schollhammer P, Mloston G, Weigand W. [FeFe]-Hydrogenase H-Cluster Mimics with Unique Planar μ-(SCH2)2ER2Linkers (E=Ge and Sn). Chemistry 2016; 23:346-359. [DOI: 10.1002/chem.201603843] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Hassan Abul-Futouh
- Institut für Anorganische und Analytische Chemie; Friedrich-Schiller-Universität Jena; Humboldt Str. 8 07743 Jena Germany
| | - Laith R. Almazahreh
- Institut für Anorganische und Analytische Chemie; Friedrich-Schiller-Universität Jena; Humboldt Str. 8 07743 Jena Germany
| | - Takahiro Sakamoto
- Department of Chemistry and Biochemistry; The University of Arizona; Tucson AZ 85721 USA
| | - Nhu Y. T. Stessman
- Department of Chemistry and Biochemistry; The University of Arizona; Tucson AZ 85721 USA
| | | | - Richard S. Glass
- Department of Chemistry and Biochemistry; The University of Arizona; Tucson AZ 85721 USA
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie; Friedrich-Schiller-Universität Jena; Humboldt Str. 8 07743 Jena Germany
| | - Mohammad El-Khateeb
- Chemistry Department; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Philippe Schollhammer
- UMR CNRS 6521; Université de Bretagne Occidentale; 6 avenue Le Gorgeu, C.S. 93837 29238 Brest-Cedex France
| | - Grzegorz Mloston
- Section of Heteroorganic Compounds; University of Lodz; Tamka 12 91-403 Łódź Poland
| | - Wolfgang Weigand
- Institut für Anorganische und Analytische Chemie; Friedrich-Schiller-Universität Jena; Humboldt Str. 8 07743 Jena Germany
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14
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Britvin SN, Rumyantsev AM, Zobnina AE, Padkina MV. Between Adamantane and Atrane: Intrabridgehead Interactions in the Cage-Like Phosphane Related to a Novel Tris(homoadamantane) Ring System. Chemistry 2016; 22:14227-35. [PMID: 27531034 DOI: 10.1002/chem.201601637] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Sergey N. Britvin
- Department of Crystallography; Saint Petersburg State University; Universitetskaya Nab. 7/9 199034 St. Petersburg Russia
| | - Andrey M. Rumyantsev
- Department of Genetics and Biotechnology; Saint Petersburg State University; Universitetskaya Nab. 7/9 199034 St. Petersburg Russia
| | - Anastasia E. Zobnina
- Department of Genetics and Biotechnology; Saint Petersburg State University; Universitetskaya Nab. 7/9 199034 St. Petersburg Russia
| | - Marina V. Padkina
- Department of Genetics and Biotechnology; Saint Petersburg State University; Universitetskaya Nab. 7/9 199034 St. Petersburg Russia
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15
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Jurss JW, Khnayzer RS, Panetier JA, El Roz KA, Nichols EM, Head-Gordon M, Long JR, Castellano FN, Chang CJ. Bioinspired design of redox-active ligands for multielectron catalysis: effects of positioning pyrazine reservoirs on cobalt for electro- and photocatalytic generation of hydrogen from water. Chem Sci 2015; 6:4954-4972. [PMID: 29142725 PMCID: PMC5664355 DOI: 10.1039/c5sc01414j] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Accepted: 06/09/2015] [Indexed: 01/18/2023] Open
Abstract
Mononuclear metalloenzymes in nature can function in cooperation with precisely positioned redox-active organic cofactors in order to carry out multielectron catalysis. Inspired by the finely tuned redox management of these bioinorganic systems, we present the design, synthesis, and experimental and theoretical characterization of a homologous series of cobalt complexes bearing redox-active pyrazines. These donor moieties are locked into key positions within a pentadentate ligand scaffold in order to evaluate the effects of positioning redox non-innocent ligands on hydrogen evolution catalysis. Both metal- and ligand-centered redox features are observed in organic as well as aqueous solutions over a range of pH values, and comparison with analogs bearing redox-inactive zinc(ii) allows for assignments of ligand-based redox events. Varying the geometric placement of redox non-innocent pyrazine donors on isostructural pentadentate ligand platforms results in marked effects on observed cobalt-catalyzed proton reduction activity. Electrocatalytic hydrogen evolution from weak acids in acetonitrile solution, under diffusion-limited conditions, reveals that the pyrazine donor of axial isomer 1-Co behaves as an unproductive electron sink, resulting in high overpotentials for proton reduction, whereas the equatorial pyrazine isomer complex 2-Co is significantly more active for hydrogen generation at lower voltages. Addition of a second equatorial pyrazine in complex 3-Co further minimizes overpotentials required for catalysis. The equatorial derivative 2-Co is also superior to its axial 1-Co congener for electrocatalytic and visible-light photocatalytic hydrogen generation in biologically relevant, neutral pH aqueous media. Density functional theory calculations (B3LYP-D2) indicate that the first reduction of catalyst isomers 1-Co, 2-Co, and 3-Co is largely metal-centered while the second reduction occurs at pyrazine. Taken together, the data establish that proper positioning of non-innocent pyrazine ligands on a single cobalt center is indeed critical for promoting efficient hydrogen catalysis in aqueous media, akin to optimally positioned redox-active cofactors in metalloenzymes. In a broader sense, these findings highlight the significance of electronic structure considerations in the design of effective electron-hole reservoirs for multielectron transformations.
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Affiliation(s)
- Jonah W Jurss
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Department of Chemistry and Biochemistry , University of Mississippi , University , MS 38677 , USA
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Rony S Khnayzer
- Department of Chemistry , North Carolina State University , Raleigh , NC 27695-8204 , USA .
- Department of Natural Sciences , Lebanese American University , Beirut 1102-2801 , Chouran , Lebanon
| | - Julien A Panetier
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Karim A El Roz
- Department of Chemistry , North Carolina State University , Raleigh , NC 27695-8204 , USA .
| | - Eva M Nichols
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Martin Head-Gordon
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Jeffrey R Long
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Felix N Castellano
- Department of Chemistry , North Carolina State University , Raleigh , NC 27695-8204 , USA .
| | - Christopher J Chang
- Department of Chemistry , University of California , Berkeley , California 94720 , USA . ; ;
- Department of Molecular and Cell Biology , University of California , Berkeley , California 94720 , USA
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
- Howard Hughes Medical Institute , University of California , Berkeley , California 94720 , USA
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16
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Gao S, Guo H, Peng X, Zhao X, Duan Q, Liang Q, Jiang D. The employment of a hydrophilic tris(morpholino)phosphine ligand in diiron propane-1,3-dithiolate complexes for potentially water-soluble iron-only hydrogenase active-site mimics. NEW J CHEM 2013. [DOI: 10.1039/c3nj41058g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Thoi VS, Sun Y, Long JR, Chang CJ. Complexes of earth-abundant metals for catalytic electrochemical hydrogen generation under aqueous conditions. Chem Soc Rev 2012; 42:2388-400. [PMID: 23034627 DOI: 10.1039/c2cs35272a] [Citation(s) in RCA: 452] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Growing global energy demands and climate change motivate the development of new renewable energy technologies. In this context, water splitting using sustainable energy sources has emerged as an attractive process for carbon-neutral fuel cycles. A key scientific challenge to achieving this overall goal is the invention of new catalysts for the reductive and oxidative conversions of water to hydrogen and oxygen, respectively. This review article will highlight progress in molecular electrochemical approaches for catalytic reduction of protons to hydrogen, focusing on complexes of earth-abundant metals that can function in pure aqueous or mixed aqueous-organic media. The use of water as a reaction medium has dual benefits of maintaining high substrate concentration as well as minimizing the environmental impact from organic additives and by-products.
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Affiliation(s)
- V Sara Thoi
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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Feng YN, Xu FF, Chen RP, Wen N, Li ZH, Du SW. Preparation, structures and electrochemical property of diiron dithiolate complexes with hydrophilic N-donor ligands. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.07.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang M, Chen L, Li X, Sun L. Approaches to efficient molecular catalyst systems for photochemical H2 production using [FeFe]-hydrogenase active site mimics. Dalton Trans 2011; 40:12793-800. [DOI: 10.1039/c1dt11166c] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bravo J, Bolaño S, Gonsalvi L, Peruzzini M. Coordination chemistry of 1,3,5-triaza-7-phosphaadamantane (PTA) and derivatives. Part II. The quest for tailored ligands, complexes and related applications. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.08.006] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Zeng X, Li Z, Liu X. Mechanistic investigations into electrocatalytic substitution reactions of two diiron hexacarbonyl complexes by triphenyl phosphine ligand. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.11.053] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Vannucci AK, Wang S, Nichol GS, Lichtenberger DL, Evans DH, Glass RS. Electronic and geometric effects of phosphatriazaadamantane ligands on the catalytic activity of an [FeFe] hydrogenase inspired complex. Dalton Trans 2010; 39:3050-6. [DOI: 10.1039/b921067a] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Felton GA, Mebi CA, Petro BJ, Vannucci AK, Evans DH, Glass RS, Lichtenberger DL. Review of electrochemical studies of complexes containing the Fe2S2 core characteristic of [FeFe]-hydrogenases including catalysis by these complexes of the reduction of acids to form dihydrogen. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.03.017] [Citation(s) in RCA: 301] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Capon JF, Gloaguen F, Pétillon FY, Schollhammer P, Talarmin J. Electron and proton transfers at diiron dithiolate sites relevant to the catalysis of proton reduction by the [FeFe]-hydrogenases. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2008.10.020] [Citation(s) in RCA: 279] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ekubo AT, Elsegood MRJ, Lake AJ, Smith MB. Intramolecular Hydrogen-Bonded Tertiary Phosphines as 1,3,5-Triaza-7-phosphaadamantane (PTA) Analogues. Inorg Chem 2009; 48:2633-8. [DOI: 10.1021/ic801709z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Allen T. Ekubo
- Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, U.K
| | - Mark R. J. Elsegood
- Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, U.K
| | - Andrew J. Lake
- Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, U.K
| | - Martin B. Smith
- Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, U.K
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Felton GAN, Vannucci AK, Okumura N, Lockett LT, Evans DH, Glass RS, Lichtenberger DL. Hydrogen Generation from Weak Acids: Electrochemical and Computational Studies in the [(η5-C5H5)Fe(CO)2]2 System. Organometallics 2008. [DOI: 10.1021/om800366h] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Greg A. N. Felton
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Aaron K. Vannucci
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Noriko Okumura
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - L. Tori Lockett
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Dennis H. Evans
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
| | - Richard S. Glass
- Department of Chemistry, The University of Arizona, Tucson, Arizona 85721
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Borg SJ, Ibrahim SK, Pickett CJ, Best SP. Electrocatalysis of hydrogen evolution by synthetic diiron units using weak acids as the proton source: Pathways of doubtful relevance to enzymic catalysis by the diiron subsite of [FeFe] hydrogenase. CR CHIM 2008. [DOI: 10.1016/j.crci.2008.04.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Li P, Wang M, Chen L, Wang N, Zhang T, Sun L. Supramolecular self-assembly of a [2Fe2S] complex with a hydrophilic phosphine ligand. CrystEngComm 2008. [DOI: 10.1039/b713159c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Carboxy-functionalized dithiolate di-iron complexes related to the active site of Fe-only hydrogenase. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.06.042] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Capon JF, Ezzaher S, Gloaguen F, Pétillon FY, Schollhammer P, Talarmin J, Davin TJ, McGrady JE, Muir KW. Electrochemical and theoretical investigations of the reduction of [Fe2(CO)5L{µ-SCH2XCH2S}] complexes related to [FeFe] hydrogenase. NEW J CHEM 2007. [DOI: 10.1039/b709273c] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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