1
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Tensi L, Dall’Anese A, Annunziata A, Mearini S, Nofrini V, Menendez Rodriguez G, Carotti A, Sardella R, Ruffo F, Macchioni A. Synthesis and Characterization of Chiral Iridium Complexes Bearing Carbohydrate Functionalized Pyridincarboxamide Ligands and Their Application as Catalysts in the Asymmetric Transfer Hydrogenation of α-Ketoacids in Water. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Leonardo Tensi
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
- Department of Pharmaceutical Sciences, University of Perugia, Via A. Fabretti 48, 06123 Perugia, Italy
| | - Anna Dall’Anese
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Alfonso Annunziata
- Department of Chemical Sciences and CIRCC, University of Naples Federico II, Via Cintia 21, 80126 Napoli, Italy
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire (IPCM), 4 Place Jussieu, F-75005 Paris, France
| | - Simone Mearini
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Vittorio Nofrini
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Gabriel Menendez Rodriguez
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Andrea Carotti
- Department of Pharmaceutical Sciences, University of Perugia, Via A. Fabretti 48, 06123 Perugia, Italy
| | - Roccaldo Sardella
- Department of Pharmaceutical Sciences, University of Perugia, Via A. Fabretti 48, 06123 Perugia, Italy
| | - Francesco Ruffo
- Department of Chemical Sciences and CIRCC, University of Naples Federico II, Via Cintia 21, 80126 Napoli, Italy
| | - 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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2
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Tensi L, Yakimov AV, Trotta C, Domestici C, De Jesus Silva J, Docherty SR, Zuccaccia C, Copéret C, Macchioni A. Single-Site Iridium Picolinamide Catalyst Immobilized onto Silica for the Hydrogenation of CO 2 and the Dehydrogenation of Formic Acid. Inorg Chem 2022; 61:10575-10586. [PMID: 35766898 PMCID: PMC9348825 DOI: 10.1021/acs.inorgchem.2c01640] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The development of
an efficient heterogeneous catalyst for storing
H2 into CO2 and releasing it from the produced
formic acid, when needed, is a crucial target for overcoming some
intrinsic criticalities of green hydrogen exploitation, such as high
flammability, low density, and handling. Herein, we report an efficient
heterogeneous catalyst for both reactions prepared by immobilizing
a molecular iridium organometallic catalyst onto a high-surface mesoporous
silica, through a sol–gel methodology. The presence of tailored
single-metal catalytic sites, derived by a suitable choice of ligands
with desired steric and electronic characteristics, in combination
with optimized support features, makes the immobilized catalyst highly
active. Furthermore, the information derived from multinuclear DNP-enhanced
NMR spectroscopy, elemental analysis, and Ir L3-edge XAS
indicates the formation of cationic iridium sites. It is quite remarkable
to note that the immobilized catalyst shows essentially the same catalytic
activity as its molecular analogue in the hydrogenation of CO2. In the reverse reaction of HCOOH dehydrogenation, it is
approximately twice less active but has no induction period. We report the synthesis of a heterogeneous
immobilized catalyst
(Ir_PicaSi_SiO2) and its successful
application in aqueous CO2 hydrogenation and FA dehydrogenation.
The information derived from multinuclear DNP-enhanced NMR spectroscopy,
elemental analysis, and XAS indicates the presence of cationic iridium
sites in Ir_PicaSi_SiO2. The
latter shows essentially the same catalytic activity as its molecular
analogue in the hydrogenation of CO2. In the reverse reaction
of HCOOH dehydrogenation, it is approximately twice less active but
has no induction period.
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Affiliation(s)
- Leonardo Tensi
- Department of Chemistry, Biology and Biotechnology and CIRCC, Università degli Studi di Perugia, Perugia 06123, Italy.,Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Alexander V Yakimov
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Caterina Trotta
- Department of Chemistry, Biology and Biotechnology and CIRCC, Università degli Studi di Perugia, Perugia 06123, Italy
| | - Chiara Domestici
- Department of Chemistry, Biology and Biotechnology and CIRCC, Università degli Studi di Perugia, Perugia 06123, Italy
| | - Jordan De Jesus Silva
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Scott R Docherty
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Cristiano Zuccaccia
- Department of Chemistry, Biology and Biotechnology and CIRCC, Università degli Studi di Perugia, Perugia 06123, Italy
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Alceo Macchioni
- Department of Chemistry, Biology and Biotechnology and CIRCC, Università degli Studi di Perugia, Perugia 06123, Italy
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3
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Rodriguez GM, Zaccaria F, Van Dijk S, Zuccaccia C, Macchioni A. Substituent Effects on the Activity of Cp*Ir(pyridine-carboxylate) Water Oxidation Catalysts: Which Ligand Fragments Remain Coordinated to the Active Ir Centers? Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Gabriel Menendez Rodriguez
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università; Degli Studi di Perugia, Via Elceo di Sotto 8, 06123 Perugia, Italy
| | - Francesco Zaccaria
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università; Degli Studi di Perugia, Via Elceo di Sotto 8, 06123 Perugia, Italy
| | - Sybren Van Dijk
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università; Degli Studi di Perugia, Via Elceo di Sotto 8, 06123 Perugia, Italy
| | - Cristiano Zuccaccia
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università; Degli Studi di Perugia, Via Elceo di Sotto 8, 06123 Perugia, Italy
| | - Alceo Macchioni
- Dipartimento di Chimica, Biologia e Biotecnologie and CIRCC, Università; Degli Studi di Perugia, Via Elceo di Sotto 8, 06123 Perugia, Italy
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4
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Construction of iridium oxide nanoparticle modified indium tin oxide electrodes with polycarboxylic acids and pyrophosphoric acid and their application to water oxidation reactions. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138683] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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5
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Geer AM, Liu C, Musgrave CB, Webber C, Johnson G, Zhou H, Sun CJ, Dickie DA, Goddard WA, Zhang S, Gunnoe TB. Noncovalent Immobilization of Pentamethylcyclopentadienyl Iridium Complexes on Ordered Mesoporous Carbon for Electrocatalytic Water Oxidation. SMALL SCIENCE 2021. [DOI: 10.1002/smsc.202100037] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- Ana M. Geer
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - Chang Liu
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - Charles B. Musgrave
- Materials and Process Simulation Center Department of Chemistry California Institute of Technology Pasadena CA 91125 USA
| | - Christopher Webber
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - Grayson Johnson
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - Hua Zhou
- Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA
| | - Cheng-Jun Sun
- Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA
| | - Diane A. Dickie
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - William A. Goddard
- Materials and Process Simulation Center Department of Chemistry California Institute of Technology Pasadena CA 91125 USA
| | - Sen Zhang
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
| | - T. Brent Gunnoe
- Department of Chemistry University of Virginia Charlottesville VA 22904 USA
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6
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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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7
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Domestici C, Tensi L, Boccalon E, Zaccaria F, Costantino F, Zuccaccia C, Macchioni A. Molecular and Heterogenized Cp*Ir Water Oxidation Catalysts Bearing Glyphosate and Glyphosine as Ancillary and Anchoring Ligands. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202001003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chiara Domestici
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
| | - Leonardo Tensi
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
| | - Elisa Boccalon
- Department of Industrial Engineering University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
| | - Francesco Zaccaria
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
| | - Ferdinando Costantino
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
| | - Cristiano Zuccaccia
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
| | - Alceo Macchioni
- Department of Chemistry Biology and Biotechnology University of Perugia and CIRCC Via Elce di Sotto, 8 06123 Perugia Italy
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8
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Domestici C, Tensi L, Zaccaria F, Kissimina N, Valentini M, D'Amato R, Costantino F, Zuccaccia C, Macchioni A. Molecular and heterogenized dinuclear Ir-Cp* water oxidation catalysts bearing EDTA or EDTMP as bridging and anchoring ligands. Sci Bull (Beijing) 2020; 65:1614-1625. [PMID: 36659037 DOI: 10.1016/j.scib.2020.06.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/16/2020] [Accepted: 06/01/2020] [Indexed: 01/21/2023]
Abstract
The development of efficient water oxidation catalysts (WOCs) is of key importance in order to drive sustainable reductive processes aimed at producing renewable fuels. Herein, two novel dinuclear complexes, [(Cp*Ir)2(μ-κ3-O,N,O-H4-EDTMP)] (Ir-H4-EDTMP, H4-EDTMP4- = ethylenediamine tetra(methylene phosphonate)) and [(Cp*Ir)2(μ-κ3-O,N,O-EDTA)] (Ir-EDTA, EDTA4- = ethylenediaminetetraacetate), were synthesized and completely characterized in solution, by multinuclear and multidimensional NMR spectroscopy, and in the solid state, by single crystal X-Ray diffraction. They were supported onto rutile TiO2 nanocrystals obtaining Ir-H4-EDTMP@TiO2 and Ir-EDTA@TiO2 hybrid materials. Both molecular complexes and hybrid materials were found to be efficient catalysts for WO driven by NaIO4, providing almost quantitative yields, and TON values only limited by the amount of NaIO4 used. As for the molecular catalysts, Ir-H4-EDTMP (TOF up to 184 min-1) exhibited much higher activity than Ir-EDTA (TOF up to 19 min-1), likely owing to the higher propensity of the former to generate a coordination vacancy through the dissociation of a Ir-OP bond (2.123 Å, significantly longer than Ir-OC, 2.0913 Å), which is a necessary step to activate these saturated complexes. Ir-H4-EDTMP@TiO2 (up to 33 min-1) and Ir-EDTA@TiO2 (up to 41 min-1) hybrid materials showed similar activity that was only marginally reduced in the second and third catalytic runs carried out after having separated the supernatant, which did not show any sign of activity, instead. The observed TOF values for hybrid materials are higher than those reported for analogous systems deriving from heterogenized mononuclear complexes. This suggests that supporting dinuclear molecular precursors could be a successful strategy to obtain efficient heterogenized water oxidation catalysts.
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Affiliation(s)
- Chiara Domestici
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy
| | - Leonardo Tensi
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy
| | - Francesco Zaccaria
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy.
| | - Nade Kissimina
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy; École Supérieure d'Ingénieurs de Rennes, University of Rennes 1, Rennes 35042, France
| | | | - Roberto D'Amato
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy
| | - Ferdinando Costantino
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy.
| | - Cristiano Zuccaccia
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy.
| | - Alceo Macchioni
- Department of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Perugia 06123, Italy.
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9
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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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10
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Fagiolari L, Bini M, Costantino F, Gatto G, Kropf AJ, Marmottini F, Nocchetti M, Wegener EC, Zaccaria F, Delferro M, Vivani R, Macchioni A. Iridium-Doped Nanosized Zn-Al Layered Double Hydroxides as Efficient Water Oxidation Catalysts. ACS APPLIED MATERIALS & INTERFACES 2020; 12:32736-32745. [PMID: 32583657 PMCID: PMC8008397 DOI: 10.1021/acsami.0c07925] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/25/2020] [Indexed: 05/29/2023]
Abstract
Layered double hydroxides (LDHs) are an ideal platform to host catalytic metal centers for water oxidation (WO) owing to the high accessibility of water to the interlayer region, which makes all centers potentially reachable and activated. Herein, we report the syntheses of three iridium-doped zinc-aluminum LDHs (Ir-LDHs) nanomaterials (1-3, with about 80 nm of planar size and a thickness of 8 nm as derived by field emission scanning electron microscopy and powder X-ray diffraction studies, respectively), carried out in the confined aqueous environment of reverse micelles, through a very simple and versatile procedure. These materials exhibit excellent catalytic performances in WO driven by NaIO4 at neutral pH and 25 °C, with an iridium content as low as 0.5 mol % (∼0.8 wt %), leading to quantitative oxygen yields (based on utilized NaIO4, turnover number up to ∼10,000). Nanomaterials 1-3 display the highest ever reported turnover frequency values (up to 402 min-1) for any heterogeneous and heterogenized catalyst, comparable only to those of the most efficient molecular iridium catalysts, tested under similar reaction conditions. The boost in activity can be traced to the increased surface area and pore volume (>5 times and 1 order of magnitude, respectively, higher than those of micrometric materials of size 0.3-1 μm) estimated for the nanosized particles, which guarantee higher noble metal accessibility. X-ray absorption spectroscopy (XAS) studies suggest that 1-3 nanomaterials, as-prepared and after catalysis, contain a mixture of isolated, single octahedral Ir(III) sites, with no evidence of Ir-Ir scattering from second-nearest neighbors, excluding the presence of IrO2 nanoparticles. The combination of the results obtained from XAS, elemental analysis, and ionic chromatography strongly suggests that iridium is embedded in the brucite-like structure of LDHs, having four hydroxyls and two chlorides as first neighbors. These results demonstrate that nanometric LDHs can be successfully exploited to engineer efficient WOCs, minimizing the amount of iridium used, consistent with the principle of the noble-metal atom economy.
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Affiliation(s)
- Lucia Fagiolari
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
| | - Marzia Bini
- Department
of Pharmaceutical Sciences and CEMIN, University
of Perugia, Via Fabretti
48, I-06123 Perugia, Italy
| | - Ferdinando Costantino
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
| | - Giordano Gatto
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
| | - A. Jeremy Kropf
- Argonne
National Laboratory, Lemont, Illinois 60439, United States
| | - Fabio Marmottini
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
| | - Morena Nocchetti
- Department
of Pharmaceutical Sciences and CEMIN, University
of Perugia, Via Fabretti
48, I-06123 Perugia, Italy
| | - Evan C. Wegener
- Argonne
National Laboratory, Lemont, Illinois 60439, United States
| | - Francesco Zaccaria
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
| | | | - Riccardo Vivani
- Department
of Pharmaceutical Sciences and CEMIN, University
of Perugia, Via Fabretti
48, I-06123 Perugia, Italy
| | - Alceo Macchioni
- Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
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11
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van Dijk B, Rodriguez GM, Wu L, Hofmann JP, Macchioni A, Hetterscheid DGH. The Influence of the Ligand in the Iridium Mediated Electrocatalyic Water Oxidation. ACS Catal 2020; 10:4398-4410. [PMID: 32280560 PMCID: PMC7137537 DOI: 10.1021/acscatal.0c00531] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/13/2020] [Indexed: 12/31/2022]
Abstract
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Electrochemical
water oxidation is the bottleneck of electrolyzers
as even the best catalysts, iridium and ruthenium oxides, have to
operate at significant overpotentials. Previously, the position of
a hydroxyl on a series of hydroxylpicolinate ligands was found to
significantly influence the activity of molecular iridium catalysts
in sacrificial oxidant driven water oxidation. In this study, these
catalysts were tested under electrochemical conditions and benchmarked
to several other known molecular iridium catalysts under the exact
same conditions. This allowed us to compare these catalysts directly
and observe whether structure–activity relationships would
prevail under electrochemical conditions. Using both electrochemical
quartz crystal microbalance experiments and X-ray photoelectron spectroscopy,
we found that all studied iridium complexes form an iridium deposit
on the electrode with binding energies ranging from 62.4 to 62.7 eV
for the major Ir 4f7/2 species. These do not match the
binding energies found for the parent complexes, which have a broader
binding energy range from 61.7 to 62.7 eV and show a clear relationship
to the electronegativity induced by the ligands. Moreover, all catalysts
performed the electrochemical water oxidation in the same order of
magnitude as the maximum currents ranged from 0.2 to 0.6 mA cm–2 once more without clear structure–activity
relationships. In addition, by employing 1H NMR spectroscopy
we found evidence for Cp* breakdown products such as acetate. Electrodeposited
iridium oxide from ligand free [Ir(OH)6]2– or a colloidal iridium oxide nanoparticles solution produces currents
almost 2 orders of magnitude higher with a maximum current of 11 mA
cm–2. Also, this deposited material contains, apart
from an Ir 4f7/2 species at 62.4 eV, an Ir species at 63.6
eV, which is not observed for any deposit formed by the molecular
complexes. Thus, the electrodeposited material of the complexes cannot
be directly linked to bulk iridium oxide. Small IrOx clusters
containing few Ir atoms with partially incorporated ligand residues
are the most likely option for the catalytically active electrodeposit.
Our results emphasize that structure–activity relationships
obtained with sacrificial oxidants do not necessarily translate to
electrochemical conditions. Furthermore, other factors, such as electrodeposition
and catalyst degradation, play a major role in the electrochemically
driven water oxidation and should thus be considered when optimizing
molecular catalysts.
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Affiliation(s)
- Bas van Dijk
- Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
| | - Gabriel Menendez Rodriguez
- Department of Chemistry, Biology and Biotechnology and CIRCC, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Longfei Wu
- Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Jan P. Hofmann
- Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - 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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12
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Volpe A, Natali M, Graiff C, Sartorel A, Tubaro C, Bonchio M. Novel iridium complexes with N-heterocyclic dicarbene ligands in light-driven water oxidation catalysis: photon management, ligand effect and catalyst evolution. Dalton Trans 2020; 49:2696-2705. [PMID: 32049077 DOI: 10.1039/c9dt04841c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iridium complexes [IrClCp*diNHC]PF6, with N-heterocyclic dicarbene (diNHC) and pentamethylcyclopentadienyl (Cp*) ligands, have been investigated in light driven water oxidation catalysis within the Ru(bpy)32+/S2O82- cycle (bpy = 2,2'-bipyridine). In particular, the effect of different diNHC ligands was evaluated by employing the complex 1a (diNHC = 1,1'-dimethyl-3,3'-ethylenediimidazol-2,2'-diylidene) and the novel and structurally characterised 2 (diNHC = 1,1'-dimethyl-3,3'-ethylene-5,5'-dibromodiimidazol-2,2'-diylidene) and 3 (diNHC = 1,1'-dimethyl-3,3'-ethylene-dibenzimidazol-2,2'-diylidene). The presented results include: (i) a photon management analysis of the 1a/Ru(bpy)32+/S2O82- system, revealing two regimes of O2 evolution rate, being dependent on the light intensity at low photon flux, where the system reaches an overall quantum yield up to 0.17 ± 0.01 (quantum efficiency 34 ± 2%), while being independent of light intensity at high photon flux thus indicating a change of limiting step; (ii) a trend of O2 evolution activity that follows the order 1a > 2 > 3 both under low and high photon flux conditions, with the reactivity that is favoured by the electron donating nature of the diNHC ligand, quantified on the basis of the carbene carbon chemical shift; (iii) an analogous trend also in the bimolecular rate constants of electron transfer kET from the iridium species to photogenerated Ru(bpy)33+, with kET values in the range 4.2-6.1 × 104 M-1 s-1, thus implying a significant reorganisation energy to the iridium sphere; (iv) the evolution of 1a, as the most active Ir species in the series, to mononuclear iridium species with lower molecular weight and originating from oxidative transformation of the organic ligand scaffold, as proven by converging UV-Vis, MALDI-MS and 1H-NMR evidences. These results can be used for the further design and engineering of novel catalysts.
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Affiliation(s)
- Andrea Volpe
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Mirco Natali
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLARCHEM), sez. Di Ferrara, via L. Borsari 46, 44121 Ferrara, Italy.
| | - Claudia Graiff
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Andrea Sartorel
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Cristina Tubaro
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
| | - Marcella Bonchio
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.
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13
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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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14
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Fagiolari L, Zaccaria F, Costantino F, Vivani R, Mavrokefalos CK, Patzke GR, Macchioni A. Ir- and Ru-doped layered double hydroxides as affordable heterogeneous catalysts for electrochemical water oxidation. Dalton Trans 2020; 49:2468-2476. [DOI: 10.1039/c9dt04306c] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Doping low-cost LDHs with noble metal atoms represents a promising approach to develop effective heterogeneous Water Oxidation Catalysts.
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Affiliation(s)
- Lucia Fagiolari
- Department of Chemistry
- Biology and Biotechnology
- Università di Perugia and CIRCC-Via Elce di Sotto 8
- I-06123 Perugia
- Italy
| | - Francesco Zaccaria
- Department of Chemistry
- Biology and Biotechnology
- Università di Perugia and CIRCC-Via Elce di Sotto 8
- I-06123 Perugia
- Italy
| | - Ferdinando Costantino
- Department of Chemistry
- Biology and Biotechnology
- Università di Perugia and CIRCC-Via Elce di Sotto 8
- I-06123 Perugia
- Italy
| | - Riccardo Vivani
- Department of Pharmaceutical Sciences
- Università di Perugia - Via del Liceo 1
- I-06123 Perugia
- Italy
| | | | - Greta R. Patzke
- Department of Chemistry
- University of Zurich - Winterthurerstrasse 190
- CH-8057 Zurich
- Switzerland
| | - Alceo Macchioni
- Department of Chemistry
- Biology and Biotechnology
- Università di Perugia and CIRCC-Via Elce di Sotto 8
- I-06123 Perugia
- Italy
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15
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Volpe A, Tubaro C, Natali M, Sartorel A, Brudvig GW, Bonchio M. Light-Driven Water Oxidation with the Ir-blue Catalyst and the Ru(bpy) 32+/S 2O 82- Cycle: Photogeneration of Active Dimers, Electron-Transfer Kinetics, and Light Synchronization for Oxygen Evolution with High Quantum Efficiency. Inorg Chem 2019; 58:16537-16545. [PMID: 31774669 DOI: 10.1021/acs.inorgchem.9b02531] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Light-driven water oxidation is achieved with the Ru(bpy)32+/S2O82- cycle employing the highly active Ir-blue water oxidation catalyst, namely, an IrIV,IV2(pyalc)2 μ-oxo-dimer [pyalc = 2-(2'-pyridyl)-2-propanoate]. Ir-blue is readily formed by stepwise oxidation of the monomeric Ir(III) precursor 1 by the photogenerated Ru(bpy)33+, with a quantum yield ϕ of up to 0.10. Transient absorption spectroscopy and kinetic evidence point to a stepwise mechanism, where the primary event occurs via a fast photoinduced electron transfer from 1 to Ru(bpy)33+, leading to the Ir(IV) monomer I1 (k1 ∼ 108 M-1 s-1). The competent Ir-blue catalyst is then obtained from I1 upon photooxidative loss of the Cp* ligand and dimerization. The Ir-blue catalyst is active in the Ru(bpy)32+/S2O82- light-driven water oxidation cycle, where it undergoes two fast photoinduced electron transfers to Ru(bpy)33+ [with kIr-blue = (3.00 ± 0.02) × 108 M-1 s-1 for the primary event, outperforming iridium oxide nanoparticles by ca. 2 orders of magnitude], leading to a IrV,V2 steady-state intermediate involved in O-O bond formation. The quantum yield for oxygen evolution depends on the photon flux, showing a saturation regime and reaching an impressive value of ϕ(O2) = 0.32 ± 0.01 (corresponding to a quantum efficiency of 64 ± 2%) at low irradiation intensity. This result highlights the key requirement of orchestrating the rate of the photochemical events with dark catalytic turnover.
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Affiliation(s)
- Andrea Volpe
- Department of Chemical Sciences , University of Padova , via Marzolo 1 , 35131 Padova , Italy
| | - Cristina Tubaro
- Department of Chemical Sciences , University of Padova , via Marzolo 1 , 35131 Padova , Italy
| | - Mirco Natali
- Department of Chemical and Pharmaceutical Sciences , University of Ferrara and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SolarChem) , sez. di Ferrara, via L. Borsari 46 , 44121 Ferrara , Italy
| | - Andrea Sartorel
- Department of Chemical Sciences , University of Padova , via Marzolo 1 , 35131 Padova , Italy
| | - Gary W Brudvig
- Department of Chemistry , Yale University , 225 Prospect Street , New Haven , Connecticut 06520-8107 , United States
| | - Marcella Bonchio
- Department of Chemical Sciences , University of Padova , via Marzolo 1 , 35131 Padova , Italy
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16
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Corbucci I, Zaccaria F, Heath R, Gatto G, Zuccaccia C, Albrecht M, Macchioni A. Iridium Water Oxidation Catalysts Based on Pyridine‐Carbene Alkyl‐Substituted Ligands. ChemCatChem 2019. [DOI: 10.1002/cctc.201901092] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ilaria Corbucci
- Department of Chemistry Biology and BiotechnologyUniversità di Perugia and CIRCC Perugia I-06123 Italy
| | - Francesco Zaccaria
- Department of Chemistry Biology and BiotechnologyUniversità di Perugia and CIRCC Perugia I-06123 Italy
| | - Rachel Heath
- Department für Chemie und BiochemieUniversität Bern Bern CH-3012 Switzerland
| | - Giordano Gatto
- Department of Chemistry Biology and BiotechnologyUniversità di Perugia and CIRCC Perugia I-06123 Italy
| | - Cristiano Zuccaccia
- Department of Chemistry Biology and BiotechnologyUniversità di Perugia and CIRCC Perugia I-06123 Italy
| | - Martin Albrecht
- Department für Chemie und BiochemieUniversität Bern Bern CH-3012 Switzerland
| | - Alceo Macchioni
- Department of Chemistry Biology and BiotechnologyUniversità di Perugia and CIRCC Perugia I-06123 Italy
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17
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Praneeth VKK, Kondo M, Okamura M, Akai T, Izu H, Masaoka S. Pentanuclear iron catalysts for water oxidation: substituents provide two routes to control onset potentials. Chem Sci 2019; 10:4628-4639. [PMID: 31123573 PMCID: PMC6495723 DOI: 10.1039/c9sc00678h] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 03/18/2019] [Indexed: 11/30/2022] Open
Abstract
The development of robust and efficient molecular catalysts based on earth-abundant transition metals for water oxidation reactions is a challenging research target. Our group recently demonstrated the high activity and stability of a pentairon-based water oxidation electrocatalyst (M. Okamura, M. Kondo, R. Kuga, Y. Kurashige, T. Yanai, S. Hayami, V. K. K. Praneeth, M. Yoshida, K. Yoneda, S. Kawata and S. Masaoka, Nature, 2016, 530, 465-468). However, the development of strategies to decrease onset potentials for catalysis remains challenging. In this article, we report the construction of a series of pentanuclear iron complexes by introducing electron-donating (methyl) and electron-withdrawing (bromo) substituents on the ligand. Two newly synthesized complexes exhibited five reversible redox processes, similar to what is seen with the parent complex. These complexes can also serve as homogeneous catalysts for water oxidation reactions, and the faradaic efficiencies of the reactions were high. Additionally, the onset potentials of the newly developed complexes were lower than that of the parent complex. Mechanistic insights revealed that there are two methods for decreasing onset potentials: control of the redox potentials of the pentairon complex and control of the reaction mechanism.
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Affiliation(s)
- Vijayendran K K Praneeth
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
| | - Mio Kondo
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
- SOKENDAI [The Graduate University for Advanced Studies] , Shonan Village , Hayama , Kanagawa 240-0193 , Japan
- ACT-C , Japan Science and Technology Agency (JST) , 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
- Research Center of Integrative Molecular Systems (CIMoS) , Institute for Molecular Science (IMS) , 38 Nishigo-naka, Myodaiji , Okazaki , Aichi 444-8585 , Japan
| | - Masaya Okamura
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
| | - Takuya Akai
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
- SOKENDAI [The Graduate University for Advanced Studies] , Shonan Village , Hayama , Kanagawa 240-0193 , Japan
| | - Hitoshi Izu
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
- SOKENDAI [The Graduate University for Advanced Studies] , Shonan Village , Hayama , Kanagawa 240-0193 , Japan
| | - Shigeyuki Masaoka
- Department of Life and Coordination-Complex Molecular Science , Institute for Molecular Science (IMS) , 5-1 Higashiyama, Myodaiji , Okazaki , Aichi 444-8787 , Japan .
- SOKENDAI [The Graduate University for Advanced Studies] , Shonan Village , Hayama , Kanagawa 240-0193 , Japan
- Research Center of Integrative Molecular Systems (CIMoS) , Institute for Molecular Science (IMS) , 38 Nishigo-naka, Myodaiji , Okazaki , Aichi 444-8585 , Japan
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18
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19
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Roa AE, Salazar V, Mendoza-Espinosa D, Paneque M, Rodríguez-Diéguez A, Rodríguez AM, Tejeda J, Castro-Osma JA, Otero A, Lara-Sánchez A. Study of the Coordination Modes of Hybrid NNCp Cyclopentadienyl/Scorpionate Ligands in Ir Compounds. Inorg Chem 2019; 58:900-908. [DOI: 10.1021/acs.inorgchem.8b03030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arián E. Roa
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, 42039 Pachuca de Soto, Hidalgo, Mexico
- Centro de Investigación en Química Aplicada, Unidad Monterrey, Alianza Sur No. 204 Parque de Innovación e Investigación Tecnológica (PIIT), 66629 Apodaca, Nuevo León, Mexico
| | - Verónica Salazar
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, 42039 Pachuca de Soto, Hidalgo, Mexico
| | - Daniel Mendoza-Espinosa
- Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, 42039 Pachuca de Soto, Hidalgo, Mexico
| | - Margarita Paneque
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Juan Tejeda
- Departamento de Química Inorgánica, Orgánica y Bioquímica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - José A. Castro-Osma
- Departamento de Química Inorgánica, Orgánica y Bioquímica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Agustín Lara-Sánchez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
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20
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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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21
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Badiei YM, Xie Y, Renderos G, Concepcion JJ, Szalda D, Guevara J, Rosales R, Ortiz E, Hankins M. Rapid identification of homogeneous O2 evolution catalysts and comparative studies of Ru(II)-carboxamides vs. Ru(II)-carboxylates in water-oxidation. J Catal 2019. [DOI: 10.1016/j.jcat.2018.10.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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22
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Macchioni A. The Middle-Earth between Homogeneous and Heterogeneous Catalysis in Water Oxidation with Iridium. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800798] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alceo Macchioni
- Department of Chemistry; Biology and Biotechnology; University of Perugia; Via Elce di Sotto 8 06123 - Perugia Italy
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23
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Sackville EV, Marken F, Hintermair U. Electrochemical and Kinetic Insights into Molecular Water Oxidation Catalysts Derived from Cp*Ir(pyridine-alkoxide) Complexes. ChemCatChem 2018; 10:4280-4291. [PMID: 31007774 PMCID: PMC6470865 DOI: 10.1002/cctc.201800916] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Indexed: 01/04/2023]
Abstract
We report the solution-phase electrochemistry of seven half-sandwich iridium(III) complexes with varying pyridine-alkoxide ligands to quantify electronic ligand effects that translate to their activity in catalytic water oxidation. Our results unify some previously reported electrochemical data of Cp*Ir complexes by showing how the solution speciation determines the electrochemical response: cationic complexes show over 1 V higher redox potentials that their neutral forms in a distinct demonstration of charge accumulation effects relevant to water oxidation. Building on previous work that analysed the activation behaviour of our pyalk-ligated Cp*Ir complexes 1-7, we assess their catalytic oxygen evolution activity with sodium periodate (NaIO4) and ceric ammonium nitrate (CAN) in water and aqueous tBuOH solution. Mechanistic studies including H/D kinetic isotope effects and reaction progress kinetic analysis (RPKA) of oxygen evolution point to a dimer-monomer equilibrium of the IrIV resting state preceding a proton-coupled electron transfer (PCET) in the turnover-limiting step (TLS). Finally, true electrochemically driven water oxidation is demonstrated for all catalysts, revealing surprising trends in activity that do not correlate with those obtained using chemical oxidants.
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Affiliation(s)
- Emma V. Sackville
- Centre for Sustainable Chemical TechnologiesUniversity of BathClaverton DownBathBA2 7AYUnited Kingdom
| | - Frank Marken
- Department of ChemistryUniversity of BathClaverton DownBathBA2 7AYUnited Kingdom
| | - Ulrich Hintermair
- Centre for Sustainable Chemical TechnologiesUniversity of BathClaverton DownBathBA2 7AYUnited Kingdom
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Revisiting O–O Bond Formation through Outer‐Sphere Water Molecules versus Bimolecular Mechanisms in Water‐Oxidation Catalysis (WOC) by Cp*Ir Based Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800500] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Annunziata A, Esposito R, Gatto G, Cucciolito ME, Tuzi A, Macchioni A, Ruffo F. Iron(III) Complexes with Cross-Bridged Cyclams: Synthesis and Use in Alcohol and Water Oxidation Catalysis. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800451] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alfonso Annunziata
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II and CIRCC; Complesso Universitario di Monte S. Angelo; Via Cintia 21 80126 Napoli Italy
| | - Roberto Esposito
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II and CIRCC; Complesso Universitario di Monte S. Angelo; Via Cintia 21 80126 Napoli Italy
| | - Giordano Gatto
- Department of Chemistry; Biology and Biochemistry; University of Perugia and CIRCC; Via Elce di Sotto, 8 06123 Perugia Italy
| | - Maria Elena Cucciolito
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II and CIRCC; Complesso Universitario di Monte S. Angelo; Via Cintia 21 80126 Napoli Italy
| | - Angela Tuzi
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II and CIRCC; Complesso Universitario di Monte S. Angelo; Via Cintia 21 80126 Napoli Italy
| | - Alceo Macchioni
- Department of Chemistry; Biology and Biochemistry; University of Perugia and CIRCC; Via Elce di Sotto, 8 06123 Perugia Italy
| | - Francesco Ruffo
- Dipartimento di Scienze Chimiche; Università di Napoli Federico II and CIRCC; Complesso Universitario di Monte S. Angelo; Via Cintia 21 80126 Napoli Italy
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Catalytic Water Oxidation by Iridium-Modified Carbonic Anhydrase. Chem Asian J 2018; 13:334-341. [DOI: 10.1002/asia.201701543] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 12/24/2017] [Indexed: 11/07/2022]
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