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Somachandra MS, Averkiev B, Sues PE. Unsymmetric Co-Facial "Salixpyrrole" Hydrogen Evolution Catalysts: Two Metals are Better than One. Inorg Chem 2024; 63:13346-13357. [PMID: 38989677 DOI: 10.1021/acs.inorgchem.4c01101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
Designing ligand architectures that can mimic enzyme active sites is a promising approach for developing efficient small molecule activation catalysts for sustainable energy applications. Some key design features include chemically distinct binding pockets for multiple metal centers and a three-dimensional structure that controls the positioning of catalytic sites. With these principles in mind, mono- and bimetallic unsymmetric cofacial palladium complexes, 2 and 3, respectively, bearing ligands with calixpyrrole and salen coordination sites, or "salixpyrrole" ligands, are reported. These species were accessed in a straightforward Schiff-base reaction with appreciable yields. In addition, both 2 and 3 were found to be active hydrogen evolution electrocatalysts using para-toluenesulfonic acid monohydrate as the proton source. The two salixpyrrole species displayed different mechanisms of action, with 2 showing a second-order dependence on acid concentration, whereas 3 exhibited a first-order dependence. Moreover, the bimetallic catalyst was significantly more efficient, with higher turnover frequencies, 4640 s-1 vs 1680 s-1 for 2, and lower overpotentials, 0.39 V vs 0.69 V for 2. The results reported herein provide proof-of-concept that bimetallic catalysts with chemically distinct binding sites demonstrate enhanced catalytic properties in comparison to monometallic or symmetric analogues.
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Affiliation(s)
| | - Boris Averkiev
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
| | - Peter E Sues
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66503, United States
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2
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Aguado S, García-Álvarez P, Cabeza JA, Casarrubios L, Sierra MA. A cross-metathesis approach for polymetallic [FeFe]-hydrogenase mimics. Dalton Trans 2024; 53:3756-3764. [PMID: 38304983 DOI: 10.1039/d3dt04197b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
A method has been developed for synthesizing [FeFe]-H2ase mimics with diverse structures and properties, employing cross-metathesis of olefins. Vinylmetallocenes (5 and 6) and vinyl half-sandwich complexes (10 and 11) have been used as cross-metathesis partners with [FeFe]-H2ase mimics (4, 8, and 9) bearing a double bond in the moiety attached to the ADT-bridge nitrogen. Electrochemical studies of these complexes, encompassing metallocene-type (7a-b, 12a-b, and 13a-b) as well as half-sandwich derivatives (12c and 13c-d), have demonstrated that the introduction of a redox unit has a marginal impact on the reduction potential of these [FeFe]-H2ase mimics. The application of this cross-metathesis approach has allowed the synthesis of [FeFe]-H2ase mimics featuring an Ir(III) electrochemical antenna (16-18) as well as systems having an electron-donor-photosensitizer structure (ED-PS) (23). The electrocatalytic properties of these complexes have been elucidated through electrochemical studies.
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Affiliation(s)
- Sergio Aguado
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
- Centro de Innovación en Química Avanzada, (ORFEO-CINQA), Spain
| | - Pablo García-Álvarez
- Departamento de Química Orgánica e Inorgánica. Facultad de Química, Universidad de Oviedo, 33071 Oviedo, Spain
- Centro de Innovación en Química Avanzada, (ORFEO-CINQA), Spain
| | - Javier A Cabeza
- Departamento de Química Orgánica e Inorgánica. Facultad de Química, Universidad de Oviedo, 33071 Oviedo, Spain
- Centro de Innovación en Química Avanzada, (ORFEO-CINQA), Spain
| | - Luis Casarrubios
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
- Centro de Innovación en Química Avanzada, (ORFEO-CINQA), Spain
| | - Miguel A Sierra
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
- Centro de Innovación en Química Avanzada, (ORFEO-CINQA), Spain
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3
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Wicker SA, Hutchison P, Musicante RG, Kiker MT, Suffern NC, Graham DK, Rhodes LM, Binu AP, Jean-Francois SA, Graves AS, Brennessel WW, Eckenhoff WT. Hydrogen Production Using a Nickel Catalyst Combining Redox Activity and Pendent Base Effects. Inorg Chem 2024; 63:451-461. [PMID: 38113512 DOI: 10.1021/acs.inorgchem.3c03308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
With the mounting need for clean and renewable energy, catalysts for hydrogen production based on earth abundant elements are of great interest. Herein, we describe the synthesis, characterization, and catalytic activity of two nickel complexes based on the pyridinediimine ligand that possess basic nitrogen moieties of pyridine and imidazole that could potentially serve as pendent bases to enhance catalysis. Although these ligands have previously been reported to be complexed to some metal ions, they have not been applied to nickel. The nickel complex with the pendent pyridines was found to be the most active of the two, catalyzing proton reduction electrochemically with an overpotential of 490 mV. The appearance of a wave that preceded the Ni(I/0) redox couple in the presence of protons suggests that protonation of a dissociated pyridine was likely. Further evidence of this was provided with density functional theory calculations, and a mechanism of hydrogen production is proposed. Furthermore, in a light-driven system containing Ru(bpy)32+ and ascorbic acid, TON of 1400 were obtained.
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Affiliation(s)
- Scott A Wicker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Phillips Hutchison
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Robert G Musicante
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Meghan T Kiker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Nicholas C Suffern
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Daniel K Graham
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Liam M Rhodes
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Aby P Binu
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Stephan A Jean-Francois
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Alex S Graves
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - William W Brennessel
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - William T Eckenhoff
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
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Li Y, Chen JY, Zhang X, Peng Z, Miao Q, Chen W, Xie F, Liao RZ, Ye S, Tung CH, Wang W. Electrocatalytic Interconversions of CO 2 and Formate on a Versatile Iron-Thiolate Platform. J Am Chem Soc 2023. [PMID: 38019775 DOI: 10.1021/jacs.3c09824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
Exploring bidirectional CO2/HCO2- catalysis holds significant potential in constructing integrated (photo)electrochemical formate fuel cells for energy storage and applications. Herein, we report selective CO2/HCO2- electrochemical interconversion by exploiting the flexible coordination modes and rich redox properties of a versatile iron-thiolate platform, Cp*Fe(II)L (L = 1,2-Ph2PC6H4S-). Upon oxidation, this iron complex undergoes formate binding to generate a diferric formate complex, [(L-)2Fe(III)(μ-HCO2)Fe(III)]+, which exhibits remarkable electrocatalytic performance for the HCO2--to-CO2 transformation with a maximum turnover frequency (TOFmax) ∼103 s-1 and a Faraday efficiency (FE) ∼92(±4)%. Conversely, this iron system also allows for reduction at -1.85 V (vs Fc+/0) and exhibits an impressive FE ∼93 (±3)% for the CO2-to-HCO2- conversion. Mechanism studies revealed that the HCO2--to-CO2 electrocatalysis passes through dicationic [(L2)-•Fe(III)(μ-HCO2)Fe(III)]2+ generated by unconventional oxidation of the diferric formate species taking place at ligand L, while the CO2-to-HCO2- reduction involves a critical intermediate of [Fe(II)-H]- that was independently synthesized and structurally characterized.
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Affiliation(s)
- Yongxian Li
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Jia-Yi Chen
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xinchao Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiqiang Peng
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Qiyi Miao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Wang Chen
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fei Xie
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Shengfa Ye
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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Trowbridge L, Averkiev B, Sues PE. Electrocatalytic Hydrogen Evolution using a Nickel-based Calixpyrrole Complex: Controlling the Secondary Coordination Sphere on an Electrode Surface. Chemistry 2023; 29:e202301920. [PMID: 37665793 PMCID: PMC10842979 DOI: 10.1002/chem.202301920] [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: 06/16/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 09/06/2023]
Abstract
Incorporating design elements from homogeneous catalysts to construct well defined active sites on electrode surfaces is a promising approach for developing next generation electrocatalysts for energy conversion reactions. Furthermore, if functionalities that control the electrode microenvironment could be integrated into these active sites it would be particularly appealing. In this context, a square planar nickel calixpyrrole complex, Ni(DPMDA) (DPMDA=2,2'-((diphenylmethylene)bis(1H-pyrrole-5,2-diyl))bis(methaneylylidene))bis(azaneylylidene))dianiline) with pendant amine groups is reported that forms a heterogeneous hydrogen evolution catalyst using anilinium tetrafluoroborate as the proton source. The supported Ni(DPMDA) catalyst was surprisingly stable and displayed fast reaction kinetics with turnover frequencies (TOF) up to 25,900 s-1 or 366,000 s-1 cm-2 . Kinetic isotope effect (KIE) studies revealed a KIE of 5.7, and this data, combined with Tafel slope analysis, suggested that a proton-coupled electron transfer (PCET) process involving the pendant amine groups was rate-limiting. While evidence of an outer-sphere reduction of the Ni(DPMDA) catalyst was observed, it is hypothesized that the control over the secondary coordination sphere provided by the pendant amines facilitated such high TOFs and enabled the PCET mechanism. The results reported herein provide insight into heterogeneous catalyst design and approaches for controlling the secondary coordination sphere on electrode surfaces.
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Affiliation(s)
- Logan Trowbridge
- Department of Chemistry, Kansas State University, 1212 Mid-Campus Drive North, Manhattan, Kansas, 66503, USA
| | - Boris Averkiev
- Department of Chemistry, Kansas State University, 1212 Mid-Campus Drive North, Manhattan, Kansas, 66503, USA
| | - Peter E Sues
- Department of Chemistry, Kansas State University, 1212 Mid-Campus Drive North, Manhattan, Kansas, 66503, USA
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6
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Hernández-Toledo HC, Flores-Alamo M, Castillo I. Bis(benzimidazole)amino thio- and selenoether Iron(II) complexes as proton reduction electrocatalysts. J Inorg Biochem 2023; 241:112128. [PMID: 36701986 DOI: 10.1016/j.jinorgbio.2023.112128] [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: 10/10/2022] [Revised: 01/10/2023] [Accepted: 01/14/2023] [Indexed: 01/22/2023]
Abstract
Two novel Iron (II) complexes featuring tetrapodal bis(benzimidazole)amino thio- and selenoether ligands (LS and LSe) were synthesized, characterized, and tested as electrocatalysts for the hydrogen evolution reaction. The bromide complexes [Fe(LS,LSe)Br2] (1-2) are highly insoluble, but their DMSO solvates were characterized by single crystal X-ray diffraction, revealing an octahedral coordination environment that does not feature coordination of the chalcogen atoms. The corresponding triflate derivatives [Fe(LS,LSe)(MeCN)3]OTf2 (1c-2c) were employed for electrocatalytic proton reduction, with 1c exhibiting higher activity, thus suggesting that the thioether may participate as a more competent pendant ligand for proton transfer.
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Affiliation(s)
- Hugo C Hernández-Toledo
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, CU 04510, Mexico
| | - Marcos Flores-Alamo
- Facultad de Química, División de Estudios de Posgrado, Universidad Nacional Autónoma de México, Circuito Exterior, CU 04510, Mexico
| | - Ivan Castillo
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, CU 04510, Mexico.
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7
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Tanase T, Nakamae K, Ura Y, Nakajima T. Aiming for dynamic behaviours of molecular metal chains. Dalton Trans 2023; 52:1147-1158. [PMID: 36453666 DOI: 10.1039/d2dt03442e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The dynamical functions of molecular metal chains, that could be derived from unique physical and chemical properties coupled with self-assembly of metal chain components, have largely been unexplored, and this review paper focuses on the dynamic behaviours of Pd chains supported by linear tetraphosphines, meso- and rac-Ph2PCH2P(Ph)CH2P(Ph)CH2PPh2 recently reported, and the current development on fine-tuning of metal chains by introducing heterometal atoms, i.e. heterometallic molecular metal chains, that are considered as promising dynamical components in the next generation.
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Affiliation(s)
- Tomoaki Tanase
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Kanako Nakamae
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Yasuyuki Ura
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Takayuki Nakajima
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
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8
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McCool JD, Zhang S, Cheng I, Zhao X. Rational development of molecular earth-abundant metal complexes for electrocatalytic hydrogen production. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(22)64150-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Singh K, Kundu A, Adhikari D. Ligand-Based Redox: Catalytic Applications and Mechanistic Aspects. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kirti Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, Manauli 140306, India
| | - Abhishek Kundu
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, Manauli 140306, India
| | - Debashis Adhikari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, Manauli 140306, India
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10
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Palladium complexes bearing calixpyrrole ligands with pendant hydrogen bond donors: Synthesis, structural characterization, electrochemistry and dihydrogen evolution. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Wang L, Wang L. Ligands modification strategies for mononuclear water splitting catalysts. Front Chem 2022; 10:996383. [PMID: 36238101 PMCID: PMC9551221 DOI: 10.3389/fchem.2022.996383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 08/03/2022] [Indexed: 11/13/2022] Open
Abstract
Artificial photosynthesis (AP) has been proved to be a promising way of alleviating global climate change and energy crisis. Among various materials for AP, molecular complexes play an important role due to their favorable efficiency, stability, and activity. As a result of its importance, the topic has been extensively reviewed, however, most of them paid attention to the designs and preparations of complexes and their water splitting mechanisms. In fact, ligands design and preparation also play an important role in metal complexes’ properties and catalysis performance. In this review, we focus on the ligands that are suitable for designing mononuclear catalysts for water splitting, providing a coherent discussion at the strategic level because of the availability of various activity studies for the selected complexes. Two main designing strategies for ligands in molecular catalysts, substituents modification and backbone construction, are discussed in detail in terms of their potentials for water splitting catalysts.
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12
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The Backbone of Success of P,N-Hybrid Ligands: Some Recent Developments. Molecules 2022; 27:molecules27196293. [PMID: 36234830 PMCID: PMC9614609 DOI: 10.3390/molecules27196293] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 09/21/2022] [Accepted: 09/21/2022] [Indexed: 12/03/2022] Open
Abstract
Organophosphorus ligands are an invaluable family of compounds that continue to underpin important roles in disciplines such as coordination chemistry and catalysis. Their success can routinely be traced back to facile tuneability thus enabling a high degree of control over, for example, electronic and steric properties. Diphosphines, phosphorus compounds bearing two separated PIII donor atoms, are also highly valued and impart their own unique features, for example excellent chelating properties upon metal complexation. In many classical ligands of this type, the backbone connectivity has been based on all carbon spacers only but there is growing interest in embedding other donor atoms such as additional nitrogen (–NH–, –NR–) sites. This review will collate some important examples of ligands in this field, illustrate their role as ligands in coordination chemistry and highlight some of their reactivities and applications. It will be shown that incorporation of a nitrogen-based group can impart unusual reactivities and important catalytic applications.
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Kwok CL, Cheng SC, Ho PY, Yiu SM, Au VKM, Ho WK, Tsang PK, Xiang J, Leung CF, Ko CC. Ligand Substituent Effects on the Light‐driven Hydrogen Evolution by Cobalt(II) Tripodal Iminopyridine Catalysts under Precious‐metal Free Conditions. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chun-Leung Kwok
- The Education University of Hong Kong Department of Science and Environmental Studies HONG KONG
| | | | - Pui-Yu Ho
- The Education University of Hong Kong Department of Science and Environmental Studies HONG KONG
| | - Shek-Man Yiu
- City University of Hong Kong Department of Chemistry HONG KONG
| | - Vonika Ka-Man Au
- The Education University of Hong Kong Department of Science and Environmental Studies HONG KONG
| | - Wing-Kei Ho
- The Education University of Hong Kong Department of Science and Environmental Studies HONG KONG
| | - Po-Keung Tsang
- The Education University of Hong Kong Department of Science and Environmental Studies HONG KONG
| | - Jing Xiang
- Yangtze University College of Chemical and Environmental Engineering CHINA
| | - Chi-Fai Leung
- The Education University of Hong Kong Science and Environmental Studies 10 Lo Ping RoadTai PoN. T. 999077 Hong Kong HONG KONG
| | - Chi-Chiu Ko
- City University of Hong Kong Department of Chemistry HONG KONG
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Wiedner ES, Appel AM, Raugei S, Shaw WJ, Bullock RM. Molecular Catalysts with Diphosphine Ligands Containing Pendant Amines. Chem Rev 2022; 122:12427-12474. [PMID: 35640056 DOI: 10.1021/acs.chemrev.1c01001] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Pendant amines play an invaluable role in chemical reactivity, especially for molecular catalysts based on earth-abundant metals. As inspired by [FeFe]-hydrogenases, which contain a pendant amine positioned for cooperative bifunctionality, synthetic catalysts have been developed to emulate this multifunctionality through incorporation of a pendant amine in the second coordination sphere. Cyclic diphosphine ligands containing two amines serve as the basis for a class of catalysts that have been extensively studied and used to demonstrate the impact of a pendant base. These 1,5-diaza-3,7-diphosphacyclooctanes, now often referred to as "P2N2" ligands, have profound effects on the reactivity of many catalysts. The resulting [Ni(PR2NR'2)2]2+ complexes are electrocatalysts for both the oxidation and production of H2. Achieving the optimal benefit of the pendant amine requires that it has suitable basicity and is properly positioned relative to the metal center. In addition to the catalytic efficacy demonstrated with [Ni(PR2NR'2)2]2+ complexes for the oxidation and production of H2, catalysts with diphosphine ligands containing pendant amines have also been demonstrated for several metals for many different reactions, both in solution and immobilized on surfaces. The impact of pendant amines in catalyst design continues to expand.
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Affiliation(s)
| | - Brian R. James
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
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16
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Hirotsu M, Sanou J, Nakae T, Matsunaga T, Kinoshita I. Crystal structures and electrochemical properties of nickel(II) complexes with N, N′, N′′, S-tetradentate Schiff base ligands. ACTA CRYSTALLOGRAPHICA SECTION E CRYSTALLOGRAPHIC COMMUNICATIONS 2022; 78:500-505. [PMID: 35547792 PMCID: PMC9069516 DOI: 10.1107/s2056989022003954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/11/2022] [Indexed: 11/10/2022]
Abstract
Nickel(II) Schiff base complexes containing thiolate S and polyamine N donor atoms exhibit electrocatalytic activity for proton reduction. The piperazine moiety in the Schiff base ligand gives a smaller bite angle, which is effective in reducing the overpotential. The thiolate nickel complexes {2-[({2-[(2-aminoethyl-κN)(methyl)amino-κN]ethyl}imino-κN)methyl]benzenethiolato-κS}nickel(II) chloride, [Ni(C12H18N3S)]Cl (1), and [2-({[2-(piperazin-1-yl-κ2N1,N4)ethyl]imino-κN}methyl)benzenethiolato-κS]nickel(II) hexafluorophosphate dichloromethane monosolvate, [Ni(C13H18N3S)]PF6·CH2Cl2 (2), were synthesized by the reactions of 2-(tert-butylthio)benzaldehyde, triamines, and nickel(II) salts. Both complexes have a nickel ion surrounded by an N,N′,N′′,S-tetradentate ligand, forming a square-planar geometry. The terminal N,N-chelating moiety is N,N-dialkylethane-1,2-diamine for 1 and 1-alkylpiperazine for 2. The N—Ni—N bite angle in the terminal N,N-chelate ring in 2 [76.05 (10)°] is much smaller than that in 1 [86.16 (6)°]. Cyclic voltammograms of 1 and 2 in aqueous media indicated that the reduction and oxidation potentials of 2 are more positive than those of 1. The smaller bite angle of the terminal piperazine chelate in 2 reduces the electron-donating ability of the tetradentate ligand, resulting in a positive shift of the redox potentials. Both complexes exhibit catalytic activity for proton reduction, and the piperazine moiety in 2 is effective in reducing the overpotential.
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Sun XX, Du J, Tan JJ, Zhan SZ. A mono-oxo-bridged binuclear iron(iii) complex with a Fe–O–Fe angle of 180.0° and its catalytic activity for hydrogen evolution. NEW J CHEM 2022. [DOI: 10.1039/d1nj05904a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There are potential applications for binuclear oxo-bridged iron complexes in biological processes, catalysts, and magnetic materials, and the design of new bridged-iron complexes is important.
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Affiliation(s)
- Xia-Xing Sun
- College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Juan Du
- College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Jie-Jie Tan
- College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Shu-Zhong Zhan
- College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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Liu Z, Lai JW, Yang G, Ren BP, Lv ZY, Si LP, Zhang H, Liu HY. Electrocatalytic Hydrogen Production by CN‑ substituted Cobalt Triaryl Corroles. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00606e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four cobalt corrole complexes bearing 0–3 cyano groups on the para-position of the three meso-phenyl rings of the macrocycle were synthesized, characterized and applied for electrocatalytic H2 production under both...
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Du J, Yang H, Wang CL, Zhan SZ. A nickel(II) complex of 2,6-pyridinedicarboxylic acid ion, an efficient electro-catalyst for both hydrogen evolution and oxidation. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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20
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Tanase T, Nakamae K, Miyano H, Fujisawa Y, Ura Y, Nakajima T. Electrochemical hydrogen formation catalysed by a Pd 8 string. Chem Commun (Camb) 2021; 57:11264-11267. [PMID: 34635898 DOI: 10.1039/d1cc04788d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The linear Pd8 complex supported by tetraphosphines reacted with HBF4 to give an unprecedented linear tetrapalladium complex with a terminal hydride, which promoted electrocatalytic hydrogen formation from HBF4 in acetonitrile. The 1D coordination polymer of Pd8 chain confined within Nafion film was applied to the electrocatalytic H2 formation.
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Affiliation(s)
- Tomoaki Tanase
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Kanako Nakamae
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Haruka Miyano
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Yoshimi Fujisawa
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Yasuyuki Ura
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
| | - Takayuki Nakajima
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-nishi-machi, Nara 630-8506, Japan.
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21
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Bhunia S, Rana A, Hematian S, Karlin KD, Dey A. Proton Relay in Iron Porphyrins for Hydrogen Evolution Reaction. Inorg Chem 2021; 60:13876-13887. [PMID: 34097396 DOI: 10.1021/acs.inorgchem.1c01079] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The efficiency of the hydrogen evolution reaction (HER) can be facilitated by the presence of proton-transfer groups in the vicinity of the catalyst. A systematic investigation of the nature of the proton-transfer groups present and their interplay with bulk proton sources is warranted. The HERs electrocatalyzed by a series of iron porphyrins that vary in the nature and number of pendant amine groups are investigated using proton sources whose pKa values vary from ∼9 to 15 in acetonitrile. Electrochemical data indicate that a simple iron porphyrin (FeTPP) can catalyze the HER at this FeI state where the rate-determining step is the intermolecular protonation of a FeIII-H- species produced upon protonation of the iron(I) porphyrin and does not need to be reduced to its formal Fe0 state. A linear free-energy correlation of the observed rate with pKa of the acid source used suggests that the rate of the HER becomes almost independent of pKa of the external acid used in the presence of the protonated distal residues. Protonation to the FeIII-H- species during the HER changes from intermolecular in FeTPP to intramolecular in FeTPP derivatives with pendant basic groups. However, the inclusion of too many pendant groups leads to a decrease in HER activity because the higher proton binding affinity of these residues slows proton transfer for the HER. These results enrich the existing understanding of how second-sphere proton-transfer residues alter both the kinetics and thermodynamics of transition-metal-catalyzed HER.
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Affiliation(s)
- Sarmistha Bhunia
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Atanu Rana
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Shabnam Hematian
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States
| | - Kenneth D Karlin
- Department of Chemistry, John Hopkins University, Baltimore, Maryland 21218, United States
| | - Abhishek Dey
- School of Chemical Science, Indian Association for the Cultivation of Science, Kolkata 700032, India
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22
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Torres A, Collado A, Gómez-Gallego M, Ramírez de Arellano C, Sierra MA. Electrocatalytic Behavior of Tetrathiafulvalene (TTF) and Extended Tetrathiafulvalene (exTTF) [FeFe] Hydrogenase Mimics. ACS ORGANIC & INORGANIC AU 2021; 2:23-33. [PMID: 36855407 PMCID: PMC9954209 DOI: 10.1021/acsorginorgau.1c00011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
TTF- and exTTF-containing [(μ-S2)Fe2(CO)6] complexes have been prepared by the photochemical reaction of TTF or exTTF and [(μ-S2)Fe2(CO)6]. These complexes are able to interact with PAHs. In the absence of air and in acid media an electrocatalytic dihydrogen evolution reaction (HER) occurs, similarly to analogous [(μ-S2)Fe2(CO)6] complexes. However, in the presence of air, the TTF and exTTF organic moieties strongly influence the electrochemistry of these systems. The reported data may be valuable in the design of [FeFe] hydrogenase mimics able to combine the HER properties of the [FeFe] cores with the unique TTF properties.
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Affiliation(s)
- Alejandro Torres
- Departamento
de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Center
for Innovation in Advanced Chemistry (ORFEO-CINQA), Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Alba Collado
- Departamento
de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Center
for Innovation in Advanced Chemistry (ORFEO-CINQA), Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Mar Gómez-Gallego
- Departamento
de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Center
for Innovation in Advanced Chemistry (ORFEO-CINQA), Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Carmen Ramírez de Arellano
- Center
for Innovation in Advanced Chemistry (ORFEO-CINQA), Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Departamento
de Química Orgánica, Universidad
de Valencia, 46100 Valencia, Spain
| | - Miguel A. Sierra
- Departamento
de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Center
for Innovation in Advanced Chemistry (ORFEO-CINQA), Facultad de Química, Universidad Complutense, 28040 Madrid, Spain,Email for M.A.S.:
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23
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Abstract
AbstractNickel-catalyzed cross-coupling and photoredox catalytic reactions has found widespread utilities in organic synthesis. Redox processes are key intermediate steps in many catalytic cycles. As a result, it is pertinent to measure and document the redox potentials of various nickel species as precatalysts, catalysts, and intermediates. The redox potentials of a transition-metal complex are governed by its oxidation state, ligand, and the solvent environment. This article tabulates experimentally measured redox potentials of nickel complexes supported on common ligands under various conditions. This review article serves as a versatile tool to help synthetic organic and organometallic chemists evaluate the feasibility and kinetics of redox events occurring at the nickel center, when designing catalytic reactions and preparing nickel complexes.1 Introduction1.1 Scope1.2 Measurement of Formal Redox Potentials1.3 Redox Potentials in Nonaqueous Solution2 Redox Potentials of Nickel Complexes2.1 Redox Potentials of (Phosphine)Ni Complexes2.2 Redox Potentials of (Nitrogen)Ni Complexes2.3 Redox Potentials of (NHC)Ni Complexes
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24
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Li T, Xie B, Zhang D, Lai C, Li X, Mou W, Cao J, Bai X, Chen L. Electrocatalytic Hydrogen Evolution Catalyzed by 3,4‐Toluenedithiolate Nickel Complexes of Bis(diphenylphosphine)amine Ligand Containing An Azahydrophilic Group. ChemCatChem 2021. [DOI: 10.1002/cctc.202100303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tao Li
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
- School of Chemical Engineering Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Bin Xie
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
- Sichuan Province Key Laboratory of Comprehensive Utilization of Vanadium and Titanium Resources Panzhihua University Airport Rd. 10 Panzhihua 617000 P. R. China
| | - Dongliang Zhang
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Chuan Lai
- School of Chemistry and Chemical Engineering Sichuan University of Arts and Science Tashi Rd. 519 Dazhou 635000 P. R. China
| | - Xiaolong Li
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Wenyu Mou
- College of Chemistry and Environmental Engineering Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Jiaxi Cao
- College of Chemistry and Environmental Engineering Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Xiaoxue Bai
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
| | - Luo Chen
- School of Materials Science and Engineering, Key Laboratory of Material Corrosion and Protection of Sichuan Province Sichuan University of Science and Engineering Xueyuan Str. 180 Zigong 643000 P. R. China
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25
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Yang X, DeLaney CR, Burns KT, Elrod LC, Mo W, Naumann H, Bhuvanesh N, Hall MB, Darensbourg MY. Self-Assembled Nickel-4 Supramolecular Squares and Assays for HER Electrocatalysts Derived Therefrom. Inorg Chem 2021; 60:7051-7061. [PMID: 33891813 DOI: 10.1021/acs.inorgchem.0c03613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solid-state structures find a self-assembled tetrameric nickel cage with carboxylate linkages, [Ni(N2S'O)I(CH3CN)]4 ([Ni-I]40), resulting from sulfur acetylation by sodium iodoacetate of an [NiN2S]22+ dimer in acetonitrile. Various synthetic routes to the tetramer, best described from XRD as a molecular square, were discovered to generate the hexacoordinate nickel units ligated by N2Sthioether, iodide, and two carboxylate oxygens, one of which is the bridge from the adjacent nickel unit in [Ni-I]40. Removal of the four iodides by silver ion precipitation yields an analogous species but with an additional vacant coordination site, [Ni-Solv]+, a cation but with coordinated solvent molecules. This also recrystallizes as the tetramer [Ni-Solv]44+. In solution, dissociation into the (presumed) monomer occurs, with coordinating solvents occupying the vacant site [Ni(N2S'O)I(solv)]0, ([Ni-I]0). Hydrodynamic radii determined from 1H DOSY NMR data suggest that monomeric units are present as well in CD2Cl2. Evans method magnetism values are consistent with triplet spin states in polar solvents; however, in CD2Cl2 solutions no paramagnetism is evident. The abilities of [Ni-I]40 and [Ni-Solv]44+ to serve as sources of electrocatalysts, or precatalysts, for the hydrogen evolution reaction (HER) were explored. Cyclic voltammetry responses and bulk coulometry with gas chromatographic analysis demonstrated that a stronger acid, trifluoroacetic acid, as a proton source resulted in H2 production from both electroprecatalysts; however, electrocatalysis developed primarily from uncharacterized deposits on the electrode. With acetic acid as a proton source, the major contribution to the HER is from homogeneous electrocatalysis. Overpotentials of 490 mV were obtained for both the solution-phase [Ni-I]0 and [Ni-Solv]+. While the electrocatalyst derived from [Ni-Solv]+ has a substantially higher TOF (102 s-1) than [Ni-I]0 (19 s-1), it has a shorter catalytically active lifespan (4 h) in comparison to [Ni-I]0 (>18 h).
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Affiliation(s)
- Xuemei Yang
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Christopher R DeLaney
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Kyle T Burns
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Lindy C Elrod
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Wenting Mo
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Haley Naumann
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Nattamai Bhuvanesh
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Michael B Hall
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
| | - Marcetta Y Darensbourg
- Texas A&M University, Department of Chemistry, College Station, Texas 77843, United States
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26
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Kaim V, Kaur-Ghumaan S. Mononuclear Mn complexes featuring N,S-/N,N-donor and 1,3,5-triaza-7-phosphaadamantane ligands: synthesis and electrocatalytic properties. NEW J CHEM 2021. [DOI: 10.1039/d1nj02104d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mononuclear Mn(i) carbonyl complexes incorporating 2-mercaptobenzothiazole or 2-mercaptobenzimidazole and phosphaadamantane ligands were evaluated as electrocatalysts for the HER both in acetonitrile and acetonitrile/water.
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Affiliation(s)
- Vishakha Kaim
- Department of Chemistry, University of Delhi, Delhi 110007, India
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27
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Suman P, Bhat HR, Janardan S, Bortamuli SP, Jha PC, Sivaramakrishna A. New Hydrazide based Tricyclic Pentacoordinate Siliconium Ions –A Facile Route to the Synthesis of Spherical Shaped Sr
5
(PO
4
)
2
SiO
4. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5909] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Pothini Suman
- Department of Chemistry, School of Advanced Sciences Vellore Institute of Technology (VIT) Vellore Tamil Nadu 632014 India
| | - Haamid R. Bhat
- School of Chemical Sciences Central University of Gujarat Gandhinagar Gujarat Sector‐30 India
| | - Sannapaneni Janardan
- Department of Chemistry, School of Advanced Sciences Vellore Institute of Technology (VIT) Vellore Tamil Nadu 632014 India
- Department of Chemistry GITAM University Nagadenehalli Bengaluru Karnataka 562163 India
| | - Sidhartha Protim Bortamuli
- Department of Chemistry, School of Advanced Sciences Vellore Institute of Technology (VIT) Vellore Tamil Nadu 632014 India
| | - Prakash C. Jha
- Centre for Applied Chemistry Central University of Gujarat Gandhinagar Gujarat 382030 India
| | - Akella Sivaramakrishna
- Department of Chemistry, School of Advanced Sciences Vellore Institute of Technology (VIT) Vellore Tamil Nadu 632014 India
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28
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A dinuclear nickel catalyst based on metal–metal cooperation for electrochemical hydrogen production. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119498] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Martin DJ, Mercado BQ, Mayer JM. Combining scaling relationships overcomes rate versus overpotential trade-offs in O 2 molecular electrocatalysis. SCIENCE ADVANCES 2020; 6:eaaz3318. [PMID: 32201730 PMCID: PMC7069693 DOI: 10.1126/sciadv.aaz3318] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 12/17/2019] [Indexed: 05/19/2023]
Abstract
The development of advanced chemical-to-electrical energy conversions requires fast and efficient electrocatalysis of multielectron/multiproton reactions, such as the oxygen reduction reaction (ORR). Using molecular catalysts, correlations between the reaction rate and energy efficiency have recently been identified. Improved catalysis requires circumventing the rate versus overpotential trade-offs implied by such "scaling relationships." Described here is an ORR system-using a soluble iron porphyrin and weak acids-with the best reported combination of rate and efficiency for a soluble ORR catalyst. This advance is achieved not by "breaking" scaling relationships but rather by combining two of them. Key to this behavior is a polycationic ligand, which enhances anionic ligand binding and changes the catalyst E 1/2. These results show how combining scaling relationships is a powerful way toward improved electrocatalysis.
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30
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Tang H, Brothers EN, Grapperhaus CA, Hall MB. Electrocatalytic Hydrogen Evolution and Oxidation with Rhenium Tris(thiolate) Complexes: A Competition between Rhenium and Sulfur for Electrons and Protons. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04579] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hao Tang
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | | | - Craig A. Grapperhaus
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky 40292, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
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31
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Patel P, Wang J, Wilson AK. Prediction of pK a s of Late Transition-Metal Hydrides via a QM/QM Approach. J Comput Chem 2020; 41:171-183. [PMID: 31495951 DOI: 10.1002/jcc.26057] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 08/04/2019] [Indexed: 11/09/2022]
Abstract
Three implicit solvation models, the conductor-like polarizable continuum model (C-PCM), the conductor-like screening model (COSMO), and universal implicit solvent model (SMD), combined with a hybrid two layer QM/QM approach (ONIOM), were utilized to calculate the pKa values, using a direct thermodynamic scheme, of a set of Group 10 transition metal (TM) hydrides in acetonitrile. To obtain the optimal combination of quantum methods for ONIOM calculations with implicit solvation models, the influence of factors, such as the choice of density functional and basis set, the atomic radii used to build a cavity in the solvent, and the size of the model system in an ONIOM scheme, was examined. Additionally, the impact of Grimme's empirical dispersion correction and exact exchange was also investigated. The results were calibrated by experimental data. This investigation provides insight about effective models for the prediction of thermodynamic properties of TM-containing complexes with bulky ligands. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Prajay Patel
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824-1322
| | - Jiaqi Wang
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Beijing Forestry University, Beijing, China, 100083
| | - Angela K Wilson
- Department of Chemistry and Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas, 76203-5017.,Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824-1322
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32
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Chen Y, Fan Q, Hossain MS, Zhan S, Liu H, Si L. Electrocatalytic Hydrogen Evolution of Cobalt and Free‐base Triaryl Corrole Bearing Hydroxyethyl Amino Groups. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201900996] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ying Chen
- Department of Chemistry The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of Technology Guangzhou 510640 China
| | - Qi‐Hang Fan
- Department of Chemistry The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of Technology Guangzhou 510640 China
| | - Md Sahadat Hossain
- Department of Chemistry The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of Technology Guangzhou 510640 China
| | - Shu‐Zhong Zhan
- Department of Chemistry The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of Technology Guangzhou 510640 China
| | - Hai‐Yang Liu
- Department of Chemistry The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of Technology Guangzhou 510640 China
| | - Li‐Ping Si
- School of Materials Science and Energy Engineering Foshan University 528000 Foshan China
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33
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Wilken M, Siewert I. Electrocatalytic Hydrogen Production with a Molecular Cobalt Complex in Aqueous Solution. ChemElectroChem 2020. [DOI: 10.1002/celc.201901913] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Mona Wilken
- Universität Göttingen, Institut für Anorganische Chemie Tammannstr. 4 37077 Göttingen Germany
| | - Inke Siewert
- Universität Göttingen, Institut für Anorganische Chemie Tammannstr. 4 37077 Göttingen Germany
- Universität Göttingen International Center for Advanced Studies of Energy Conversion 37077 Göttingen Germany
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34
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Shan C, Yao S, Driess M. Where silylene–silicon centres matter in the activation of small molecules. Chem Soc Rev 2020; 49:6733-6754. [DOI: 10.1039/d0cs00815j] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Small molecules such as H2, N2, CO, NH3, O2 are ubiquitous stable species and their activation and role in the formation of value-added products are of fundamental importance in nature and industry.
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Affiliation(s)
- Changkai Shan
- Department of Chemistry
- Metalorganics and Inorganic Materials
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Shenglai Yao
- Department of Chemistry
- Metalorganics and Inorganic Materials
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Matthias Driess
- Department of Chemistry
- Metalorganics and Inorganic Materials
- Technische Universität Berlin
- 10623 Berlin
- Germany
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35
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Affiliation(s)
- Vishakha Kaim
- Department of Chemistry; University of Delhi; 110007 Delhi India
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36
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Wang J, Yamauchi K, Huang H, Sun J, Luo Z, Zhong D, Lu T, Sakai K. A Molecular Cobalt Hydrogen Evolution Catalyst Showing High Activity and Outstanding Tolerance to CO and O
2. Angew Chem Int Ed Engl 2019; 58:10923-10927. [DOI: 10.1002/anie.201904578] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Indexed: 01/08/2023]
Affiliation(s)
- Jia‐Wei Wang
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Kosei Yamauchi
- Department of ChemistryFaculty of Science, and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
| | - Hai‐Hua Huang
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Jia‐Kai Sun
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Zhi‐Mei Luo
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Di‐Chang Zhong
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
| | - Tong‐Bu Lu
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Ken Sakai
- Department of ChemistryFaculty of Science, and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
- Center for Molecular Systems (CMS)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
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37
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Viertl W, Pann J, Pehn R, Roithmeyer H, Bendig M, Rodríguez-Villalón A, Bereiter R, Heiderscheid M, Müller T, Zhao X, Hofer TS, Thompson ME, Shi S, Brueggeller P. Performance of enhanced DuBois type water reduction catalysts (WRC) in artificial photosynthesis - effects of various proton relays during catalysis. Faraday Discuss 2019; 215:141-161. [PMID: 30942209 DOI: 10.1039/c8fd00162f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Inspired by natural photosynthesis, features such as proton relays have been integrated into water reduction catalysts (WRC) for effective production of hydrogen. Research by DuBois et al. showed the crucial influence of these relays, largely in the form of pendant amine functions. In this work catalysts are presented containing innovative diphosphinoamine ligands: [M(ii)Cl2(PNP-C1)], [M(ii)(MeCN)2(PNP-C1)]2+, [M(ii)(PNP-C1)2]2+, and [M(ii)Cl(PNP-C2)]+ (M = Pt2+, Pd2+, Ni2+, Co2+; PNP-C1 = N,N-bis{(di(2-methoxyphenyl)phosphino)methyl}-N-alkylamine, PNP-C2 = N,N-bis{(di(2-methoxyphenyl)phosphino)ethyl}-N-alkylamine and alkyl = Me, Et, iso-Pr, Bz). Synthetic strategies and detailed characterisation are covered, including 1H-, 13C-, and 31P-NMR analysis, mass spectroscopy and single crystal X-ray diffractometry (XRD). The catalytic properties have been explored by changing the pendant amines and auxiliary methoxy coordination sites, as well as enlarging the ligand backbone. Moreover, confirmed by density functional theory (DFT) calculations based on XRD data in vacuo and solvent environment, two very different catalytic cycles are proposed. PNP-C1 shows a classical proton relay, whereas PNP-C2 allows an additional coordination of nitrogen, acting optionally like a pincer. Through new insights into efficiency and stability-increasing influences of proton relays in general, their number per metal centre, an enlarged ligand backbone and the use of solvato instead of halogenido complexes, substantial improvements have been made in catalytic performance over the DuBois et al. catalysts and recently self-made WRCs. The turnover number (TON) related to the single site of cost-efficient nickel WRCs is increased from 11.4 to 637, whereas a corresponding palladium catalyst gives TON as high as 2289.
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Affiliation(s)
- Wolfgang Viertl
- University of Innsbruck, Centrum for Chemistry and Biomedicine, Institute of General, Inorganic and Theoretical Chemistry, Innrain 82, 6020 Innsbruck, Austria
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Wang J, Yamauchi K, Huang H, Sun J, Luo Z, Zhong D, Lu T, Sakai K. A Molecular Cobalt Hydrogen Evolution Catalyst Showing High Activity and Outstanding Tolerance to CO and O
2. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904578] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jia‐Wei Wang
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Kosei Yamauchi
- Department of ChemistryFaculty of Science, and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
| | - Hai‐Hua Huang
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Jia‐Kai Sun
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Zhi‐Mei Luo
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Di‐Chang Zhong
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
| | - Tong‐Bu Lu
- MOE International Joint Laboratory of Materials MicrostructureInstitute for New Energy Materials and Low Carbon TechnologiesTianjin University of Technology Tianjin 300384 China
- MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat-Sen University Guangzhou 510275 China
| | - Ken Sakai
- Department of ChemistryFaculty of Science, and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
- Center for Molecular Systems (CMS)Kyushu University Motooka 744 Nishi-ku Fukuoka 819-0395 Japan
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Gueret R, Castillo CE, Rebarz M, Thomas F, Sliwa M, Chauvin J, Dautreppe B, Pécaut J, Fortage J, Collomb MN. Cobalt(II) Pentaaza-Macrocyclic Schiff Base Complex as Catalyst for Light-Driven Hydrogen Evolution in Water: Electrochemical Generation and Theoretical Investigation of the One-Electron Reduced Species. Inorg Chem 2019; 58:9043-9056. [DOI: 10.1021/acs.inorgchem.9b00447] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Robin Gueret
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
| | | | - Mateusz Rebarz
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie Infrarouge et Raman, F59 000 Lille, France
| | | | - Michel Sliwa
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie Infrarouge et Raman, F59 000 Lille, France
| | | | - Baptiste Dautreppe
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France
- Univ. Grenoble Alpes, CEA, CNRS, IRI, SYMMES 38000 Grenoble, France
| | - Jacques Pécaut
- Univ. Grenoble Alpes, CEA, CNRS, IRI, SYMMES 38000 Grenoble, France
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Shen R, Xie J, Xiang Q, Chen X, Jiang J, Li X. Ni-based photocatalytic H2-production cocatalysts2. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63294-8] [Citation(s) in RCA: 195] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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41
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Dalle K, Warnan J, Leung JJ, Reuillard B, Karmel IS, Reisner E. Electro- and Solar-Driven Fuel Synthesis with First Row Transition Metal Complexes. Chem Rev 2019; 119:2752-2875. [PMID: 30767519 PMCID: PMC6396143 DOI: 10.1021/acs.chemrev.8b00392] [Citation(s) in RCA: 421] [Impact Index Per Article: 84.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Indexed: 12/31/2022]
Abstract
The synthesis of renewable fuels from abundant water or the greenhouse gas CO2 is a major step toward creating sustainable and scalable energy storage technologies. In the last few decades, much attention has focused on the development of nonprecious metal-based catalysts and, in more recent years, their integration in solid-state support materials and devices that operate in water. This review surveys the literature on 3d metal-based molecular catalysts and focuses on their immobilization on heterogeneous solid-state supports for electro-, photo-, and photoelectrocatalytic synthesis of fuels in aqueous media. The first sections highlight benchmark homogeneous systems using proton and CO2 reducing 3d transition metal catalysts as well as commonly employed methods for catalyst immobilization, including a discussion of supporting materials and anchoring groups. The subsequent sections elaborate on productive associations between molecular catalysts and a wide range of substrates based on carbon, quantum dots, metal oxide surfaces, and semiconductors. The molecule-material hybrid systems are organized as "dark" cathodes, colloidal photocatalysts, and photocathodes, and their figures of merit are discussed alongside system stability and catalyst integrity. The final section extends the scope of this review to prospects and challenges in targeting catalysis beyond "classical" H2 evolution and CO2 reduction to C1 products, by summarizing cases for higher-value products from N2 reduction, C x>1 products from CO2 utilization, and other reductive organic transformations.
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Affiliation(s)
| | | | - Jane J. Leung
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Bertrand Reuillard
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Isabell S. Karmel
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Erwin Reisner
- Christian Doppler Laboratory
for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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Harmalkar SS, Narulkar DD, Butcher RJ, Deshmukh MS, Kumar Srivastava A, Mariappan M, Lama P, Dhuri SN. Dual-site aqua mononuclear nickel(II) complexes of non-heme tetradentate ligands: Synthesis, characterization and reactivity. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.10.069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Luo S, Siegler MA, Bouwman E. Transition Metal Compounds of Pyridine‐Amide‐Functionalized Carbene Ligands: Synthesis, Structure, and Electrocatalytic Properties in Proton Reduction. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Siyuan Luo
- Leiden Institute of Chemistry Gorlaeus Laboratories Leiden University P.O. Box 9502 2300 RA Leiden The Netherlands
| | - Maxime A. Siegler
- Department of Chemistry Johns Hopkins University 3400 N. Charles Street 21218 Baltimore Maryland USA
| | - Elisabeth Bouwman
- Leiden Institute of Chemistry Gorlaeus Laboratories Leiden University P.O. Box 9502 2300 RA Leiden The Netherlands
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Wang JW, Liu WJ, Zhong DC, Lu TB. Nickel complexes as molecular catalysts for water splitting and CO2 reduction. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2017.12.009] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Beyene BB, Das K, Kerayu BA, Datta A, Hung CH. Electrocatalytic H2 evolution of a Schiff-base assisted Cu(II) derivative as catalyst on homogeneous and heterogeneous phase. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2018.10.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Cano-Benítez CA, Metta-Magaña AJ, Duarte-Ruiz Á. Crystal structure at 100 K of bis-[1,2-bis-(di-phenyl-phosphan-yl)ethane]-nickel(II) bis-(tri-fluoro-methane-sulfonate): a possible negative thermal expansion mol-ecular material. Acta Crystallogr E Crystallogr Commun 2018; 74:1678-1681. [PMID: 30443405 PMCID: PMC6218916 DOI: 10.1107/s2056989018014846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 10/19/2018] [Indexed: 11/25/2022]
Abstract
In the title salt, [Ni(C26H24P2)2](CF3SO3)2 or [Ni(dppe)2]2+·(OTf-)2 [dppe = 1,2-bis-(di-phenyl-phosphan-yl)ethane and OTf- = tri-fluoro-methane-sulfonate], the Ni atom (site symmetry ) has a square-planar geometry with the bidentate ligands chelating the metal. As a result of the steric hindrance of the phenyl rings, the counter-ions are blocked from the metal coordination sphere. The dynamic disorder of the anion existing at 296 K is reduced at 100 K and based on these two temperatures, negative thermal expansion behaviour is observed.
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Affiliation(s)
- Cristian A. Cano-Benítez
- Departamento de Química, Universidad Nacional de Colombia, Ciudad Universitaria, Bogotá Kr 30 No 45-03, Colombia
| | - Alejandro J. Metta-Magaña
- Department of Chemistry and Biochemistry, University of Texas at El Paso, 500 W University El Paso, Texas 79968, USA
| | - Álvaro Duarte-Ruiz
- Departamento de Química, Universidad Nacional de Colombia, Ciudad Universitaria, Bogotá Kr 30 No 45-03, Colombia
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Eckenhoff WT. Molecular catalysts of Co, Ni, Fe, and Mo for hydrogen generation in artificial photosynthetic systems. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.11.002] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Base-assisted stereoselective H/D-exchange in the backbone of a Pd(PNP) 2 Cl 2 complex. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Porphyrin-Based Electrochemical H2 Evolution: Role of Central Metal Ion on Overpotential and Catalytic Activity. Electrocatalysis (N Y) 2018. [DOI: 10.1007/s12678-018-0477-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chu KT, Liu YC, Chung MW, Poerwoprajitno AR, Lee GH, Chiang MH. Energy-Efficient Hydrogen Evolution by Fe-S Electrocatalysts: Mechanistic Investigations. Inorg Chem 2018; 57:7620-7630. [PMID: 29893554 DOI: 10.1021/acs.inorgchem.8b00543] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The intrinsic catalytic property of a Fe-S complex toward H2 evolution was investigated in a wide range of acids. The title complex exhibited catalytic events at -1.16 and -1.57 V (vs Fc+/Fc) in the presence of trifluoromethanesulfonic acid (HOTf) and trifluoroacetic acid (TFA), respectively. The processes corresponded to the single reduction of the Fe-hydride-S-proton and Fe-hydride species, respectively. When anilinium acid was used, the catalysis occurred at -1.16 V, identical with the working potential of the HOTf catalysis, although the employment of anilinium acid was only capable of achieving the Fe-hydride state on the basis of the spectral and calculated results. The thermodynamics and kinetics of individual steps of the catalysis were analyzed by density functional theory (DFT) calculations and electroanalytical simulations. The stepwise CCE or CE (C, chemical; E, electrochemical) mechanism was operative from the HOTf or TFA source, respectively. In contrast, the involvement of anilinium acid most likely initiated a proton-coupled electron transfer (PCET) pathway that avoided the disfavored intermediate after the initial protonation. Via the PCET pathway, the heterogeneous electron transfer rate was increased and the overpotential was decreased by 0.4 V in comparison with the stepwise pathways. The results showed that the PCET-involved catalysis exhibited substantial kinetic and thermodynamic advantages in comparison to the stepwise pathway; thus, an efficient catalytic system for proton reduction was established.
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Affiliation(s)
- Kai-Ti Chu
- Institute of Chemistry , Academia Sinica , Nankang, Taipei 115 , Taiwan
| | - Yu-Chiao Liu
- Institute of Chemistry , Academia Sinica , Nankang, Taipei 115 , Taiwan
| | - Min-Wen Chung
- Institute of Chemistry , Academia Sinica , Nankang, Taipei 115 , Taiwan
| | | | - Gene-Hsiang Lee
- Instrumentation Center , National Taiwan University , Taipei 106 , Taiwan
| | - Ming-Hsi Chiang
- Institute of Chemistry , Academia Sinica , Nankang, Taipei 115 , Taiwan
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