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Tanjedrew N, Thammanatpong K, Surawatanawong P, Chakthranont P, Chantarojsiri T, Unjarern T, Kiatisevi S. Tunable Metal-Free Imidazole-Benzimidazole Electrocatalysts for Oxygen Reduction in Aqueous Solutions. Chemistry 2024; 30:e202302854. [PMID: 37924228 DOI: 10.1002/chem.202302854] [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: 09/01/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 11/06/2023]
Abstract
A series of metal-free imidazole-benzimidazole catalysts (ImBenz-H, ImBenz-NO2 , ImBenz-OCH3 ) for oxygen reduction reaction (ORR) were prepared. We demonstrate that the electrocatalytic O2 reduction by ImBenz-NO2 with the electron-withdrawing group showed high selectivity toward H2 O with the number of electrons transferred (n=3.7) in a neutral aqueous solution. The highest ORR selectivity toward H2 O2 was achieved using ImBenz-H (n=2.4) in an alkaline solution. Electrochemical studies of reaction kinetics disclosed that the highest turnover frequencies were obtained from ImBenz-H in both neutral and alkaline aqueous solutions. The results prove that the ORR selectivity is tunable by modulating the substituent of the ImBenz catalysts. Furthermore, DFT calculations suggested that the ORR mechanism of ImBenz-H involves the electron transfer from imidazole-benzimidazole to O2 resulting in the formation of H2 O2 which supports the redox active properties of the catalysts ImBenz.
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Affiliation(s)
- Narisara Tanjedrew
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Kittimeth Thammanatpong
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Panida Surawatanawong
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Pongkarn Chakthranont
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Pathum Thani, 12120, Thailand
| | - Teera Chantarojsiri
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Takdanai Unjarern
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
| | - Supavadee Kiatisevi
- Department of Chemistry and, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
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2
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Langerman M, van Langevelde PH, van de Vijver JJ, Siegler MA, Hetterscheid DGH. Scaling Relation between the Reduction Potential of Copper Catalysts and the Turnover Frequency for the Oxygen and Hydrogen Peroxide Reduction Reactions. Inorg Chem 2023; 62:19593-19602. [PMID: 37976110 DOI: 10.1021/acs.inorgchem.3c02939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Changes in the electronic structure of copper complexes can have a remarkable impact on the catalytic rates, selectivity, and overpotential of electrocatalytic reactions. We have investigated the effect of the half-wave potential (E1/2) of the CuII/CuI redox couples of four copper complexes with different pyridylalkylamine ligands. A linear relationship was found between E1/2 of the catalysts and the logarithm of the maximum rate constant of the reduction of O2 and H2O2. Computed binding constants of the binding of O2 to CuI, which is the rate-determining step of the oxygen reduction reaction, also correlate with E1/2. Higher catalytic rates were found for catalysts with more negative E1/2 values, while catalytic reactions with lower overpotentials were found for complexes with more positive E1/2 values. The reduction of O2 is more strongly affected by the E1/2 than the H2O2 rates, resulting in that the faster catalysts are prone to accumulate peroxide, while the catalysts operating with a low overpotential are set up to accommodate the 4-electron reduction to water. This work shows that the E1/2 is an important descriptor in copper-mediated O2 reduction and that producing hydrogen peroxide selectively close to its equilibrium potential at 0.68 V vs reversible hydrogen electrode (RHE) may not be easy.
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Affiliation(s)
- Michiel Langerman
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA Leiden, The Netherlands
| | - Phebe H van Langevelde
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA Leiden, The Netherlands
| | - Johannes J van de Vijver
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA Leiden, The Netherlands
| | - Maxime A Siegler
- Department of Chemistry, Johns Hopkins University, 3400 North Charles St., Baltimore, Maryland 21218, United States
| | - Dennis G H Hetterscheid
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA Leiden, The Netherlands
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3
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Raju S, Teimouri M, Adhikari B, Donnadieu B, Stokes SL, Emerson JP. Copper complexes for the chemoselective N-arylation of arylamines and sulfanilamides via Chan-Evans-Lam cross-coupling. Dalton Trans 2023; 52:15986-15994. [PMID: 37847415 DOI: 10.1039/d3dt02659k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Copper(II) complexes with tridentate NNN-ligands were utilized for Chan-Evans-Lam (CEL) cross-coupling reactions to enable the N-arylation of multifarious N-nucleophiles through the activation of aryl boronic acids. A condition-specific methodology was developed to chemoselectively target the amine versus sulfonamide N-arylation of 4-aminobenzenesulfonamide using new catalysts. Two different pyridine-based ligands and corresponding copper(II) complexes were characterized using 1H and 13C-NMR, FTIR, and UV-vis spectroscopy, HRMS, single-crystal X-ray diffraction, and cyclic voltammetry. Solvent and base-controlled cross-coupling reactions were observed, which led to the optimization of selective conditions for targeted C-N bond formation of sulfanilamides. Beyond the chemoselective processes reported here, a breadth of N-nucleophiles including sulfanilamides and arylamines were screened for arylation by this CEL catalyst.
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Affiliation(s)
- Selvam Raju
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | - Mohsen Teimouri
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | - Bhupendra Adhikari
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | - Bruno Donnadieu
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | - Sean L Stokes
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
| | - Joseph P Emerson
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
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4
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Skavenborg ML, Møller MS, Miller CJ, Hjelm J, Waite TD, McKenzie CJ. Electrocatalysis of the Oxygen Reduction Reaction by Copper Complexes with Tetradentate Tripodal Ligands. Inorg Chem 2023; 62:18219-18227. [PMID: 37877669 DOI: 10.1021/acs.inorgchem.3c02738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
The tetradentate tripodal ligand scaffold is capable of supporting the expected geometries of the copper ion during the oxygen reduction reaction (ORR) catalysis. As such, we probed the reactivity of copper complexes with these types of ligands by electronically and structurally tweaking the tris(pyridin 2-ylmethyl)amine (tmpa) scaffold by progressively replacing the terminal pyridines with carboxylate donors. This work shows that systems with one carboxylato donor (bpg = bis(pyridin-2-ylmethyl)glycine), (bpp = (3-(bis(pyridin-2-ylmethyl)amino)propanoic acid)) are active in electrocatalyzing the homogeneous ORR under circumneutral aqueous conditions. Turnover frequencies in the range from 105 to 106 s-1, on par with that for Cu-tmpa under identical conditions, were obtained. It is noteworthy that the CuII/CuI redox potentials for the Cu-bpg, Cu-bpp, and Cu-tmpa systems in phosphate-buffered water (pH 7, under Ar) are similar at -0.409, -0.375, and -0.401 V vs Ag/AgCl, respectively. This is rationalized by the influence of the Lewis acidity of the copper ions on the water coligand. Corroborating this are pKa values for [Cu(tmpa)(H2O)]2+, Cu(bpg)(H2O)]+, and [Cu(bpp)(H2O)]+ of 6.6, 8.8, and 10.2, respectively. Thus, the overall charge of the solution species for all three complexes will be +1 at pH 7 and this will be an important determinant for the redox potentials and, in turn, the catalytic overpotentials, which are also similar. A cis carboxylato donor offers H-bonding possibilities for exogenous resting state water and intermediate hydroperoxo coligands. This is reflected by the higher pKa values for Cu-bpp and Cu-bpg compared with that for Cu-tmpa, with the Cu-bpp system furnishing the least strained H-bonding.
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Affiliation(s)
- Mathias L Skavenborg
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense M 5230, Denmark
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Mads Sondrup Møller
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense M 5230, Denmark
| | - Christopher J Miller
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Johan Hjelm
- Technical University of Denmark, Department of Energy Conversion and Storage, Fysikvej, Building 310, 2800 Kgs Lyngby, Denmark
| | - T David Waite
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Christine J McKenzie
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense M 5230, Denmark
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5
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Hoefnagel ME, Rademaker D, Hetterscheid DGH. Directing the Selectivity of Oxygen Reduction to Water by Confining a Cu Catalyst in a Metal Organic Framework. CHEMSUSCHEM 2023; 16:e202300392. [PMID: 37326580 DOI: 10.1002/cssc.202300392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/17/2023]
Abstract
Electrocatalysis is to play a key role in the transition towards a sustainable chemical and energy industry and active, stable and selective redox catalysts are much needed. Porous structures such as metal organic frameworks (MOFs) are interesting materials as these may influence selectivity of chemical reactions through confinement effects. In this work, the oxygen reduction catalyst Cu-tmpa was incorporated into the NU1000 MOF. Confinement of the catalyst within NU1000 steers the selectivity of the oxygen reduction reaction (ORR) towards water rather than peroxide. This is attributed to retention of the obligatory H2 O2 intermediate in close proximity to the catalytic center. Moreover, the resulting NU1000|Cu-tmpa MOF shows an excellent activity and stability in prolonged electrochemical studies, illustrating the potential of this approach.
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Affiliation(s)
- Marlene E Hoefnagel
- Leiden Institute of Chemistry, Leiden University, P.O Box 9502, 2300 RA, Leiden, The Netherlands
| | - Dana Rademaker
- Leiden Institute of Chemistry, Leiden University, P.O Box 9502, 2300 RA, Leiden, The Netherlands
| | - Dennis G H Hetterscheid
- Leiden Institute of Chemistry, Leiden University, P.O Box 9502, 2300 RA, Leiden, The Netherlands
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Manna K, Kumar R, Sundaresan A, Natarajan S. Fixing CO 2 under Atmospheric Conditions and Dual Functional Heterogeneous Catalysis Employing Cu MOFs: Polymorphism, Single-Crystal-to-Single-Crystal (SCSC) Transformation and Magnetic Studies. Inorg Chem 2023; 62:13738-13756. [PMID: 37586090 DOI: 10.1021/acs.inorgchem.3c01245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
New copper compounds, [Cu(C14H8O6)(C10H8N2)(H2O)] (1), [Cu(C14H8O6)(C10H8N2)(H2O)]·(C3H7ON)2 (2), [Cu(C14H8O6)(C10H8N2)(H2O)2]·(C3H7ON) (3), [Cu(C14H8O6)(C10H8N4)] (4), and [Cu(C14H8O6)(C10H8N4)]·(H2O) (5), were prepared employing 2,5-bis(prop-2-yn-1-yloxy)terephthalic acid (2,5-BPTA) as the primary ligand and 4,4'-bipyridine (1-3) and 4,4'-azopyridine (4-5) as the secondary ligands. Single-crystal studies indicated that compounds 1-4 have two-dimensional layer structures and compound 5 has a three-dimensional structure. Compounds 1-3 were isolated from the same reaction mixture but by varying the time of reaction. The framework structures of compounds 1-3 are similar and may be considered as polymorphic structures. Compounds 4 and 5 can also be considered polymorphic with a change in dimensionality of the structure. Compounds 1-3 can be formed through a single-crystal-to-single-crystal transformation under a suitable solvent mixture. The Cu center was explored for the Lewis acid-catalyzed cycloaddition reaction of epoxide and CO2 under ambient conditions in a solventless condition and also for the synthesis of propargylamine derivatives by three-component coupling reactions (A3 coupling) in a DCM medium. The Lewis basic functionality of the MOF (-N═N- group) has been explored for the Henry reaction (aldol condensation) in a solventless condition. In all of the catalytic reactions, good yields and recyclability were observed. The magnetic studies indicated that compounds 1 and 4 have antiferromagnetic interactions and compound 5 has ferromagnetic interactions. The present studies illustrated the rich diversity that the copper-containing compounds exhibit in extended framework structures.
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Affiliation(s)
- Krishna Manna
- Framework Solids Laboratory, Solid State and Structural Chemistry Unit Indian Institute of Science, Bangalore 560012, India
| | - Rahul Kumar
- School of Advanced Materials and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Athinarayanan Sundaresan
- School of Advanced Materials and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Srinivasan Natarajan
- Framework Solids Laboratory, Solid State and Structural Chemistry Unit Indian Institute of Science, Bangalore 560012, India
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7
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Kim B, Karlin KD. Ligand-Copper(I) Primary O 2-Adducts: Design, Characterization, and Biological Significance of Cupric-Superoxides. Acc Chem Res 2023; 56:2197-2212. [PMID: 37527056 PMCID: PMC11152209 DOI: 10.1021/acs.accounts.3c00297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
In this Account, we overview and highlight synthetic bioinorganic chemistry focused on initial adducts formed from the reaction of reduced ligand-copper(I) coordination complexes with molecular oxygen, reactions that produce ligand-CuII(O2•-) complexes (O2•- ≡ superoxide anion). We provide mostly a historical perspective, starting in the Karlin research group in the 1980s, emphasizing the ligand design and ligand effects, structure, and spectroscopy of these O2 adducts and subsequent further reactivity with substrates, including the interaction with a second ligand-CuI complex to form binuclear species. The Account emphasizes the approach, evolution, and results obtained in the Karlin group, a synthetic bioinorganic research program inspired by the state of knowledge and insights obtained on enzymes possessing copper ion active sites which process molecular oxygen. These constitute an important biochemistry for all levels/types of organisms, bacteria, fungi, insects, and mammals, including humans.Copper is earth abundant, and its redox properties in complexes allow for facile CuII/CuI interconversions. Simple salts or coordination complexes have been well known to serve as oxidants for the stoichiometric or catalytic oxidation or oxygenation (i.e., O-atom insertion) of organic substrates. Thus, copper dioxygen- or peroxide-centered synthetic bioinorganic studies provide strong relevance and potential application to synthesis or even the development of cathodic catalysts for dioxygen reduction to hydrogen peroxide or water, as in fuel cells. The Karlin group's focus however was primarily oriented toward bioinorganic chemistry with the goal to provide fundamental insights into the nature of copper-dioxygen adducts and further reduced and/or protonated derivatives, species likely occurring in enzyme turnover or related in one or more aspects of formation, structure, spectroscopic properties, and scope of reactivity toward organic/biochemical substrates.Prior to this time, the 1980s, O2 adducts of redox-active first-row transition-metal ions focused on iron, such as the porphyrinate-Fe centers occurring in the oxygen carrier proteins myoglobin and hemoglobin and that determined to occur in cytochrome P-450 monooxygenase turnover. Deoxy (i.e., reduced Fe(II)) heme proteins react with O2, giving FeIII-superoxo complexes (preferably referred to by traditional biochemists as ferrous-oxy species). And, it was in the 1970s that great strides were made by synthetic chemists in generating hemes capable of forming O2 adducts, their physiochemical characterization providing critical insights to enzyme (bio)chemistry and providing ideas and important goals leading to countless person years of future research.
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Affiliation(s)
- Bohee Kim
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Kenneth D Karlin
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
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8
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Skavenborg ML, Møller MS, Mossin S, Waite TD, McKenzie CJ. Sulfonamido-Pincer Complexes of Cu(II) and the Electrocatalysis of O 2 Reduction. Inorg Chem 2023; 62:12741-12749. [PMID: 37535840 DOI: 10.1021/acs.inorgchem.3c01262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Heteroleptic copper complexes of an asymmetrical pincer ligand containing a central anionic sulfonamide donor (pyridine-2-yl-sulfonyl)(quinolin-8-yl)-amide (psq), which contains a central anionic sulfonamido donor have been prepared. Meridional κ3-N,N″,N‴ binding with the co-ligands acetate, chloride, or acetonitrile (MeCN), trans to the central sulfonamido N-donor, is revealed by the X-ray crystal structures of [Cu(OAc)(psq)(H2O)], [CuCl(psq)]2, and [Cu(psq)(MeCN)](PF6). Either overall distorted square pyramidal or octahedral geometries of the copper atom are satisfied by coordinated water in the case of the acetate complex or interactions with periphery sulfonamido oxygen atoms on adjacent molecules in the dimeric chloride and 1D polymeric acetonitrile complexes. The cyclic voltammogram (CV) of [Cu(OAc)(psq)(H2O)] shows a quasi-reversible CuII/CuI reduction at -0.930 V (vs Fc+/Fc0, MeCN), and an irreversible CuII/CuI reduction for [Cu(psq)(MeCN)](PF6) is seen at -0.838 V. This signal is split into two quasi-reversible redox processes on the addition of 2,2,2-trifluoroethanol (TFE). This suggests that TFE pushes a solution equilibrium toward a dimeric acetate complex analogous to [CuCl(psq)]2, which shows two quasi-reversible waves at -0.666 V and -0.904 V vs Fc+/Fc0 consistent with its dimeric solid-state structure. A comparison of the CVs of [Cu(OAc)(psq)(H2O)] under either a N2 or an O2 atmosphere revealed that this complex catalyzes turnover electro-reduction of O2 to H2O2 and H2O. The rate of reaction increases on addition of a weak organic acid, and a coulombic efficiency of 48% for H2O2 was determined by iodometric titration. We propose that a CuI complex formed on electroreduction binds O2 to yield an intermediate superoxide complex. On electron and proton transfer to this species, a bifurcated route back to the O2-activating CuI complex is feasible with either release of H2O2 or O-O cleavage resulting in the liberation of H2O. The CuI complex is regenerated by subsequent reduction and protonation to close the cycle.
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Affiliation(s)
- Mathias L Skavenborg
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, 5230 Odense M, Denmark
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Mads Sondrup Møller
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, 5230 Odense M, Denmark
| | - Susanne Mossin
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800 Kgs Lyngby, Denmark
| | - T David Waite
- Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Christine J McKenzie
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, 5230 Odense M, Denmark
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9
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van Langevelde P, Kounalis E, Killian L, Monkcom EC, Broere DLJ, Hetterscheid DGH. Mechanistic Investigations into the Selective Reduction of Oxygen by a Multicopper Oxidase T3 Site-Inspired Dicopper Complex. ACS Catal 2023; 13:5712-5722. [PMID: 37123598 PMCID: PMC10127274 DOI: 10.1021/acscatal.3c01143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/24/2023] [Indexed: 05/02/2023]
Abstract
Understanding how multicopper oxidases (MCOs) reduce oxygen in the trinuclear copper cluster (TNC) is of great importance for development of catalysts for the oxygen reduction reaction (ORR). Herein, we report a mechanistic investigation into the ORR activity of the dinuclear copper complex [Cu2L(μ-OH)]3+ (L = 2,7-bis[bis(2-pyridylmethyl)aminomethyl]-1,8-naphthyridine). This complex is inspired by the dinuclear T3 site found in the MCO active site and confines the Cu centers in a rigid scaffold. We show that the electrochemical reduction of [Cu2L(μ-OH)]3+ follows a proton-coupled electron transfer pathway and requires a larger overpotential due to the presence of the Cu-OH-Cu motif. In addition, we provide evidence that metal-metal cooperativity takes place during catalysis that is facilitated by the constraints of the rigid ligand framework, by identification of key intermediates along the catalytic cycle of [Cu2L(μ-OH)]3+ . Electrochemical studies show that the mechanisms of the ORR and hydrogen peroxide reduction reaction found for [Cu2L(μ-OH)]3+ differ from the ones found for analogous mononuclear copper catalysts. In addition, the metal-metal cooperativity results in an improved selectivity for the four-electron ORR of more than 70% because reaction intermediates can be stabilized better between both copper centers. Overall, the mechanism of the [Cu2L(μ-OH)]3+ -catalyzed ORR in this work contributes to the understanding of how the cooperative function of multiple metals in close proximity can affect ORR activity and selectivity.
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Affiliation(s)
| | - Errikos Kounalis
- Organic
Chemistry and Catalysis, Institute for Sustainable and Circular Chemistry,
Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Lars Killian
- Leiden
Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands
- Organic
Chemistry and Catalysis, Institute for Sustainable and Circular Chemistry,
Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Emily C. Monkcom
- Organic
Chemistry and Catalysis, Institute for Sustainable and Circular Chemistry,
Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Daniël L. J. Broere
- Organic
Chemistry and Catalysis, Institute for Sustainable and Circular Chemistry,
Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
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10
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Mo X, Deng Y, Lai SKM, Gao X, Yu HL, Low KH, Guo Z, Wu HL, Au-Yeung HY, Tse ECM. Mechanical Interlocking Enhances the Electrocatalytic Oxygen Reduction Activity and Selectivity of Molecular Copper Complexes. J Am Chem Soc 2023; 145:6087-6099. [PMID: 36853653 DOI: 10.1021/jacs.2c10988] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Efficient O2 reduction reaction (ORR) for selective H2O generation enables advanced fuel cell technology. Nonprecious metal catalysts are viable and attractive alternatives to state-of-the-art Pt-based materials that are expensive. Cu complexes inspired by Cu-containing O2 reduction enzymes in nature are yet to reach their desired ORR catalytic performance. Here, the concept of mechanical interlocking is introduced to the ligand architecture to enforce dynamic spatial restriction on the Cu coordination site. Interlocked catenane ligands could govern O2 binding mode, promote electron transfer, and facilitate product elimination. Our results show that ligand interlocking as a catenane steers the ORR selectivity to H2O as the major product via the 4e- pathway, rivaling the selectivity of Pt, and boosts the onset potential by 130 mV, the mass activity by 1.8 times, and the turnover frequency by 1.5 fold as compared to the noninterlocked counterpart. Our Cu catenane complex represents one of the first examples to take advantage of mechanical interlocking to afford electrocatalysts with enhanced activity and selectivity. The mechanistic insights gained through this integrated experimental and theoretical study are envisioned to be valuable not just to the area of ORR energy catalysis but also with broad implications on interlocked metal complexes that are of critical importance to the general fields in redox reactions involving proton-coupled electron transfer steps.
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Affiliation(s)
- Xiaoyong Mo
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
| | - Yulin Deng
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
| | - Samuel Kin-Man Lai
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
| | - Xutao Gao
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
| | - Hung-Ling Yu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Kam-Hung Low
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
| | - Zhengxiao Guo
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
- HKU Zhejiang Institute of Research and Innovation, Hangzhou 311305, People's Republic of China
| | - Heng-Liang Wu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Ho Yu Au-Yeung
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
- State Key Laboratory of Synthetic Chemistry, University of Hong Kong, Hong Kong, China
| | - Edmund C M Tse
- Department of Chemistry, HKU-CAS Joint Laboratory of New Materials, University of Hong Kong, Hong Kong, China
- HKU Zhejiang Institute of Research and Innovation, Hangzhou 311305, People's Republic of China
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11
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Zhao Y, Adiyeri Saseendran DP, Huang C, Triana CA, Marks WR, Chen H, Zhao H, Patzke GR. Oxygen Evolution/Reduction Reaction Catalysts: From In Situ Monitoring and Reaction Mechanisms to Rational Design. Chem Rev 2023; 123:6257-6358. [PMID: 36944098 DOI: 10.1021/acs.chemrev.2c00515] [Citation(s) in RCA: 55] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are core steps of various energy conversion and storage systems. However, their sluggish reaction kinetics, i.e., the demanding multielectron transfer processes, still render OER/ORR catalysts less efficient for practical applications. Moreover, the complexity of the catalyst-electrolyte interface makes a comprehensive understanding of the intrinsic OER/ORR mechanisms challenging. Fortunately, recent advances of in situ/operando characterization techniques have facilitated the kinetic monitoring of catalysts under reaction conditions. Here we provide selected highlights of recent in situ/operando mechanistic studies of OER/ORR catalysts with the main emphasis placed on heterogeneous systems (primarily discussing first-row transition metals which operate under basic conditions), followed by a brief outlook on molecular catalysts. Key sections in this review are focused on determination of the true active species, identification of the active sites, and monitoring of the reactive intermediates. For in-depth insights into the above factors, a short overview of the metrics for accurate characterizations of OER/ORR catalysts is provided. A combination of the obtained time-resolved reaction information and reliable activity data will then guide the rational design of new catalysts. Strategies such as optimizing the restructuring process as well as overcoming the adsorption-energy scaling relations will be discussed. Finally, pending current challenges and prospects toward the understanding and development of efficient heterogeneous catalysts and selected homogeneous catalysts are presented.
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Affiliation(s)
- Yonggui Zhao
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | | | - Chong Huang
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Carlos A Triana
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Walker R Marks
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Hang Chen
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Han Zhao
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Greta R Patzke
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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12
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Bidirectional O2 reduction/H2O oxidation boosted by a pentadentate pyridylalkylamine copper(II) complex. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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13
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Venegas R, Muñoz-Becerra K, Juillard S, Zhang L, Oñate R, Ponce I, Vivier V, Recio FJ, Sánchez-Sánchez CM. Proving ligand structure-reactivity correlation on multinuclear copper electrocatalysts supported on carbon black for the oxygen reduction reaction. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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14
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Brazzolotto D, Nédellec Y, Philouze C, Holzinger M, Thomas F, Le Goff A. Functionalizing Carbon Nanotubes with Bis(2,9-dialkyl-1,10-phenanthroline)copper(II) Complexes for the Oxygen Reduction Reaction. Inorg Chem 2022; 61:14997-15006. [DOI: 10.1021/acs.inorgchem.2c01791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - Alan Le Goff
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
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15
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Rodríguez SL, Sánchez-Sánchez M, Zamaro JM, Fernández JL. Understanding electron transfer processes and oxygen reduction electrocatalysis in nanocrystalline Cu-MOF-74. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Jung SM, Yang M, Song WJ. Symmetry-Adapted Synthesis of Dicopper Oxidases with Divergent Dioxygen Reactivity. Inorg Chem 2022; 61:12433-12441. [DOI: 10.1021/acs.inorgchem.2c01898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Se-Min Jung
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Minwoo Yang
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Woon Ju Song
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Republic of Korea
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17
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Charette BJ, Griffin PJ, Zimmerman CM, Olshansky L. Conformationally dynamic copper coordination complexes. Dalton Trans 2022; 51:6212-6219. [PMID: 35357384 PMCID: PMC9188647 DOI: 10.1039/d2dt00312k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The interplay between oxidation state and coordination geometry dictates both kinetic and thermodynamic properties underlying electron transfer events in copper coordination complexes. An ability to stabilize both CuI and CuII oxidation states in a single conformationally dynamic chelating ligand allows access to controlled redox reactivity. We report an analysis of the conformational dynamics of CuI complexes bearing dipicolylaniline (dpaR) ligands, with ortho-aniline substituents R = H and R = OMe. Variable temperature NMR spectroscopy and electrochemical experiments suggest that in solution at room temperature, an equilibrium exists between two conformers. Two metal-centered redox events are observed which, bolstered by structural information from single crystal X-ray diffraction and solution information from EPR and NMR spectroscopies, are ascribed to the CuII/I couple in planar and tetrahedral conformations. Activation and equilibrium parameters for these structural interconversions are presented and provide entry to leveraging redox-triggered conformational dynamics at Cu.
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Affiliation(s)
- Bronte J Charette
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA.
| | - Paul J Griffin
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA.
| | - Claire M Zimmerman
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA.
| | - Lisa Olshansky
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA.
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18
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Richezzi M, Ferreyra J, Puzzolo J, Milesi L, Palopoli CM, Moreno DM, Hureau C, Signorella SR. Versatile Activity of a Copper(II) Complex Bearing a N4‐Tetradentate Schiff Base Ligand with Reduced Oxygen Species. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Micaela Richezzi
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Joaquín Ferreyra
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Juan Puzzolo
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Lisandro Milesi
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Claudia M. Palopoli
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Diego M. Moreno
- Universidad Nacional de Rosario Facultad de Ciencias Bioquimicas y Farmaceuticas Química Física ARGENTINA
| | - Christelle Hureau
- CNRS: Centre National de la Recherche Scientifique LCC - Laboratoire de Chimie de Coordination FRANCE
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19
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van der Ham CJM, Zwagerman DNH, Wu L, Hofmann JP, Hetterscheid D. A heterogenized copper phenanthroline system to catalyze the oxygen reduction reaction. ChemElectroChem 2022; 9:e202101365. [PMID: 35911790 PMCID: PMC9305121 DOI: 10.1002/celc.202101365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/23/2021] [Indexed: 11/17/2022]
Abstract
Upon the electrochemical reduction of an in situ generated 5‐diazo‐1,10‐phenanthroline ion, phenanthroline was covalently attached to a gold electrode. The grafted molecules act as a ligand when brought in contact with a copper‐containing electrolyte solution. As the ligands are limited in spatial movement, the exclusive formation of the active species with only one phenanthroline ligand coordinated was expected. The in situ generated complexes have been investigated for activity in the oxygen reduction reaction, for which an overpotential of 800 mV is observed. During catalysis, initially a thick copper layer is formed on top of an organic layer that is still present on the gold surface. Upon deterioration of the organic layer underneath the copper over time, the amount of copper on the electrode and thereby the electrocatalytic activity decreases.
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Affiliation(s)
| | - Damy N. H. Zwagerman
- Leiden University: Universiteit Leiden Leiden Institute of Chemistry NETHERLANDS
| | - Longfei Wu
- University of Technology Eindhoven: Technische Universiteit Eindhoven department of chemical engineering and chemistry NETHERLANDS
| | - Jan P. Hofmann
- Technische Universitat Darmstadt FG Oberflachenforschung GERMANY
| | - Dennis Hetterscheid
- Leiden Institute of Chemistry Department of Chemistry Einsteinweg 55Room number EE4.19 2333 CC Leiden NETHERLANDS
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20
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Rajak S, Vu NN, Kaur P, Duong A, Nguyen-Tri P. Recent progress on the design and development of diaminotriazine based molecular catalysts for light-driven hydrogen production. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214375] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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21
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Smits NWG, Rademaker D, Konovalov AI, Siegler MA, Hetterscheid DGH. Influence of the spatial distribution of copper sites on the selectivity of the oxygen reduction reaction. Dalton Trans 2021; 51:1206-1215. [PMID: 34951437 PMCID: PMC8763313 DOI: 10.1039/d1dt03296h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Moving towards a hydrogen economy raises the demand for affordable and efficient catalysts for the oxygen reduction reaction. Cu-bmpa (bmpa = bis(2-picolyl)amine) is shown to have moderate activity, but poor selectivity for the 4-electron reduction of oxygen to water. To enhance the selectivity towards water formation, the cooperative effect of three Cu-bmpa binding sites in a single trinuclear complex is investigated. The catalytic currents in the presence of the trinuclear sites are lower, possibly due to the more rigid structure and therefore higher reorganization energies and/or slower diffusion rates of the catalytic species. Although the oxygen reduction activity of the trinuclear complexes is lower than that of mononuclear Cu-bmpa, the selectivity of the copper mediated oxygen reduction was significantly enhanced towards the 4-electron process due to a cooperative effect between three copper centers that have been positioned in close proximity. These results indicate that the cooperativity between metal ions within biomimetic sites can greatly enhance the ORR selectivity.
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Affiliation(s)
- N W G Smits
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - D Rademaker
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - A I Konovalov
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
| | - M A Siegler
- Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
| | - D G H Hetterscheid
- Leiden Institute of Chemistry, Leiden University, P.O. box 9502, 2300 RA Leiden, The Netherlands.
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22
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Berthonnaud L, Esmieu C, Mallet-Ladeira S, Hureau C. Solid-state and solution characterizations of [(TMPA)Cu(II)(SO 3)] and [(TMPA)Cu(II)(S 2O 3)] complexes: Application to sulfite and thiosulfate fast detection. J Inorg Biochem 2021; 225:111601. [PMID: 34597885 DOI: 10.1016/j.jinorgbio.2021.111601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/03/2021] [Accepted: 09/09/2021] [Indexed: 10/20/2022]
Abstract
Sulfite (SO32-) and thiosulfate (S2O32-) ions are used as food preservative and antichlor agent respectively. To detect low levels of such anions we used Cu(II) complex of the Tris-Methyl Pyridine Amine (TMPA) ligand, denoted L. Formation of [LCu(SO3)] (1) and [LCu(S2O3)] (2) in solution were monitored using UV-Vis, EPR and cyclic voltammetry, while the solid-state X-ray structures of both complexes were solved. In addition, we also evaluated the pH range in which the complexes are stable, and the anions binding affinity values for the [LCu(solvent)]2+ (3) parent complex. As a matter of illustration, we determined the sulfite content in a commercial crystal sugar.
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Affiliation(s)
- Léonie Berthonnaud
- LCC-CNRS, Université de Toulouse, CNRS, Toulouse, France; Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, Japan
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23
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Vargo NP, Harland JB, Musselman BW, Lehnert N, Ertem MZ, Robinson JR. Calcium‐Ion Binding Mediates the Reversible Interconversion of
Cis
and
Trans
Peroxido Dicopper Cores. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Natasha P. Vargo
- Department of Chemistry Brown University 324 Brook Street Providence RI 02912 USA
| | - Jill B. Harland
- Department of Chemistry and Department of Biophysics University of Michigan 930 North University Avenue Ann Arbor MI 41809-1055 USA
| | - Bradley W. Musselman
- Department of Chemistry and Department of Biophysics University of Michigan 930 North University Avenue Ann Arbor MI 41809-1055 USA
| | - Nicolai Lehnert
- Department of Chemistry and Department of Biophysics University of Michigan 930 North University Avenue Ann Arbor MI 41809-1055 USA
| | - Mehmed Z. Ertem
- Chemistry Division, Energy & Photon Sciences Brookhaven National Laboratory PO Box 5000 Upton NY 11973-5000 USA
| | - Jerome R. Robinson
- Department of Chemistry Brown University 324 Brook Street Providence RI 02912 USA
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24
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Vargo NP, Harland JB, Musselman BW, Lehnert N, Ertem MZ, Robinson JR. Calcium-Ion Binding Mediates the Reversible Interconversion of Cis and Trans Peroxido Dicopper Cores. Angew Chem Int Ed Engl 2021; 60:19836-19842. [PMID: 34101958 DOI: 10.1002/anie.202105421] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/07/2021] [Indexed: 01/27/2023]
Abstract
Coupled dinuclear copper oxygen cores (Cu2 O2 ) featured in type III copper proteins (hemocyanin, tyrosinase, catechol oxidase) are vital for O2 transport and substrate oxidation in many organisms. μ-1,2-cis peroxido dicopper cores (C P) have been proposed as key structures in the early stages of O2 binding in these proteins; their reversible isomerization to other Cu2 O2 cores are directly relevant to enzyme function. Despite the relevance of such species to type III copper proteins and the broader interest in the properties and reactivity of bimetallic C P cores in biological and synthetic systems, the properties and reactivity of C P Cu2 O2 species remain largely unexplored. Herein, we report the reversible interconversion of μ-1,2-trans peroxido (T P) and C P dicopper cores. CaII mediates this process by reversible binding at the Cu2 O2 core, highlighting the unique capability for metal-ion binding events to stabilize novel reactive fragments and control O2 activation in biomimetic systems.
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Affiliation(s)
- Natasha P Vargo
- Department of Chemistry, Brown University, 324 Brook Street, Providence, RI, 02912, USA
| | - Jill B Harland
- Department of Chemistry and Department of Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 41809-1055, USA
| | - Bradley W Musselman
- Department of Chemistry and Department of Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 41809-1055, USA
| | - Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 41809-1055, USA
| | - Mehmed Z Ertem
- Chemistry Division, Energy & Photon Sciences, Brookhaven National Laboratory, PO Box 5000, Upton, NY, 11973-5000, USA
| | - Jerome R Robinson
- Department of Chemistry, Brown University, 324 Brook Street, Providence, RI, 02912, USA
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25
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Langerman M, Hetterscheid DGH. Mechanistic Study of the Activation and the Electrocatalytic Reduction of Hydrogen Peroxide by Cu-tmpa in Neutral Aqueous Solution. ChemElectroChem 2021; 8:2783-2791. [PMID: 34589379 PMCID: PMC8453753 DOI: 10.1002/celc.202100436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/04/2021] [Indexed: 11/29/2022]
Abstract
Hydrogen peroxide plays an important role as an intermediate and product in the reduction of dioxygen by copper enzymes and mononuclear copper complexes. The copper(II) tris(2-pyridylmethyl)amine complex (Cu-tmpa) has been shown to produce H2O2 as an intermediate during the electrochemical 4-electron reduction of O2. We investigated the electrochemical hydrogen peroxide reduction reaction (HPRR) by Cu-tmpa in a neutral aqueous solution. The catalytic rate constant of the reaction was shown to be one order of magnitude lower than the reduction of dioxygen. A significant solvent kinetic isotope effect (KIE) of 1.4 to 1.7 was determined for the reduction of H2O2, pointing to a Fenton-like reaction pathway as the likely catalytic mechanism, involving a single copper site that produces an intermediate copper(II) hydroxo species and a free hydroxyl radical anion in the process.
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Affiliation(s)
- Michiel Langerman
- Leiden Institute of ChemistryLeiden UniversityP.O Box 95022300 RALeidenThe Netherlands
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26
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Gentil S, Molloy JK, Carrière M, Gellon G, Philouze C, Serre D, Thomas F, Le Goff A. Substituent Effects in Carbon-Nanotube-Supported Copper Phenolato Complexes for Oxygen Reduction Reaction. Inorg Chem 2021; 60:6922-6929. [PMID: 33759509 DOI: 10.1021/acs.inorgchem.1c00157] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Unprotected mononuclear pyrene-modified (bispyridylaminomethyl)methylphenol copper complexes were designed to be immobilized at multiwalled carbon nanotube (MWCNT) electrodes and form dinuclear bis(μ-phenolato) complexes on the surface. These complexes exhibit a high oxygen reduction reaction activity of 12.7 mA cm-2 and an onset potential of 0.78 V versus reversible hydrogen electrode. The higher activity of these complexes compared to that of mononuclear complexes with bulkier groups is induced by the favorable early formation of a dinuclear catalytic species on MWCNT.
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Affiliation(s)
- Solène Gentil
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France.,Laboratoire de Chimie et Biologie des Métaux, CEA, CNRS, Université Grenoble Alpes, Grenoble 38000, France
| | | | - Marie Carrière
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France
| | - Gisèle Gellon
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France
| | | | - Doti Serre
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France
| | - Fabrice Thomas
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France
| | - Alan Le Goff
- CNRS, DCM, Université Grenoble Alpes, Grenoble 38000, France
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