1
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Pahar S, Maayan G. An intramolecular cobalt-peptoid complex as an efficient electrocatalyst for water oxidation at low overpotential. Chem Sci 2024; 15:12928-12938. [PMID: 39148784 PMCID: PMC11323339 DOI: 10.1039/d4sc01182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 07/05/2024] [Indexed: 08/17/2024] Open
Abstract
Water electrolysis is the simplest way to produce hydrogen, as a clean renewable fuel. However, the high overpotential and slow kinetics hamper its applicability. Designing efficient and stable electrocatalysts for water oxidation (WO), which is the first and limiting step of the water splitting process, can overcome this limitation. However, the development of such catalysts based on non-precious metal ions is still challenging. Herein we describe a bio-inspired Co(iii)-based complex i.e., a stable and efficient molecular electrocatalyst for WO, constructed from a peptidomimetic oligomer called peptoid - N-substituted glycine oligomer - bearing two binding ligands, terpyridine and bipyridine, and one ethanolic group as a proton shuttler. Upon binding of a cobalt ion, this peptoid forms an intramolecular Co(iii) complex, that acts as an efficient electrocatalyst for homogeneous WO in aqueous phosphate buffer at pH 7 with a high faradaic efficiency of up to 92% at an overpotential of about 430 mV, which is the lowest reported for Co-based homogeneous WO electrocatalysts to date. We demonstrated the high stability of the complex during electrocatalytic WO and that the ethanolic side chain plays a key role in the stability and activity of the complex and also in facilitating water binding, thus mimicking an enzymatic second coordination sphere.
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Affiliation(s)
- Suraj Pahar
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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2
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Khatua M, Goswami B, Devi A, Kamal, Hans S, Samanta S. A Phosphine-Oxide Cobalt(II) Complex and Its Catalytic Activity Studies toward Alcohol Dehydrogenation Triggered Direct Synthesis of Imines and Quinolines. Inorg Chem 2024; 63:9786-9800. [PMID: 38739882 DOI: 10.1021/acs.inorgchem.4c00086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Herein, a new pincer-like amino phosphine donor ligand, H2L1, and its phosphine-oxide analog, H2L2, were synthesized. Subsequently, cobalt(II) complexes 1 and 2 were synthesized by the reaction of anhydrous Co(II)Cl2 with ligands H2L1 and H2L2, respectively. The ligands and complexes were fully characterized by various physicochemical and spectroscopic characterization techniques. Finally, the identity of the complexes 1 and 2 was confirmed by single crystal X-ray structure determination. The phosphine ligand containing complex 1 was converted to the phosphine oxide ligand containing complex 2 in air in acetonitrile solution. Both complexes 1 and 2 were investigated as precatalysts for alcohol dehydrogenation-triggered synthesis of imines in air. The phosphine-oxide complex 2 was more efficient than the phosphine complex 1. A wide array of alcohols and amines were successfully reacted in a mild condition to result in imines in good to excellent yields. Precatalyst 2 was also highly efficient for the synthesis of varieties of quinolines in air. As H2L2 in 2 has side arms that can be deprotonated, we investigated complex 2 for its base (KOtBu) promoted deprotonation events by various spectroscopic studies and DFT calculations. These studies have shown that mono deprotonation of the amine side arm attached to the pyridine is quite feasible, and deprotonation of complex 2 leads to a dearomatized pyridyl ring containing complex 2a. The mechanistic investigations of the catalytic reaction, by a combination of experimental and computational studies, have suggested that the dearomatized complex, 2a acted as an active catalyst. The reaction proceeded through the hydride transfer pathway. The activation barrier of this step was calculated to be 26.5 kcal/mol, which is quite consistent with the experimental reaction temperature under aerobic conditions. Although various pincer-like complexes are explored for such reactions, phosphine oxide ligand-containing complexes are still unexplored.
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Affiliation(s)
- Manas Khatua
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal 741246, India
| | - Bappaditya Goswami
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal 741246, India
| | - Ambika Devi
- Department of Chemistry, Indian Institute of Technology (IIT) Jammu, Jagti, Jammu, Jammu and Kashmir 181221, India
| | - Kamal
- Department of Chemistry, Indian Institute of Technology (IIT) Jammu, Jagti, Jammu, Jammu and Kashmir 181221, India
| | - Shivali Hans
- Department of Chemistry, Indian Institute of Technology (IIT) Jammu, Jagti, Jammu, Jammu and Kashmir 181221, India
| | - Subhas Samanta
- Department of Chemistry, Indian Institute of Technology (IIT) Jammu, Jagti, Jammu, Jammu and Kashmir 181221, India
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3
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Malik DD, Ryu W, Kim Y, Singh G, Kim JH, Sankaralingam M, Lee YM, Seo MS, Sundararajan M, Ocampo D, Roemelt M, Park K, Kim SH, Baik MH, Shearer J, Ray K, Fukuzumi S, Nam W. Identification, Characterization, and Electronic Structures of Interconvertible Cobalt-Oxygen TAML Intermediates. J Am Chem Soc 2024; 146:13817-13835. [PMID: 38716885 PMCID: PMC11216523 DOI: 10.1021/jacs.3c14346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
The reaction of Li[(TAML)CoIII]·3H2O (TAML = tetraamido macrocyclic tetraanionic ligand) with iodosylbenzene at 253 K in acetone in the presence of redox-innocent metal ions (Sc(OTf)3 and Y(OTf)3) or triflic acid affords a blue species 1, which is converted reversibly to a green species 2 upon cooling to 193 K. The electronic structures of 1 and 2 have been determined by combining advanced spectroscopic techniques (X-band electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR), X-ray absorption spectroscopy/extended X-ray absorption fine structure (XAS/EXAFS), and magnetic circular dichroism (MCD)) with ab initio theoretical studies. Complex 1 is best represented as an S = 1/2 [(Sol)(TAML•+)CoIII---OH(LA)]- species (LA = Lewis/Brønsted acid and Sol = solvent), where an S = 1 Co(III) center is antiferromagnetically coupled to S = 1/2 TAML•+, which represents a one-electron oxidized TAML ligand. In contrast, complex 2, also with an S = 1/2 ground state, is found to be multiconfigurational with contributions of both the resonance forms [(H-TAML)CoIV═O(LA)]- and [(H-TAML•+)CoIII═O(LA)]-; H-TAML and H-TAML•+ represent the protonated forms of TAML and TAML•+ ligands, respectively. Thus, the interconversion of 1 and 2 is associated with a LA-associated tautomerization event, whereby H+ shifts from the terminal -OH group to TAML•+ with the concomitant formation of a terminal cobalt-oxo species possessing both singlet (SCo = 0) Co(III) and doublet (SCo = 1/2) Co(IV) characters. The reactivities of 1 and 2 at different temperatures have been investigated in oxygen atom transfer (OAT) and hydrogen atom transfer (HAT) reactions to compare the activation enthalpies and entropies of 1 and 2.
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Affiliation(s)
- Deesha D Malik
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Wooyeol Ryu
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Yujeong Kim
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Korea
| | - Gurjot Singh
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Jun-Hyeong Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science, Daejeon 34141, Korea
| | | | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Mi Sook Seo
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Mahesh Sundararajan
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science, Daejeon 34141, Korea
- Theoretical Chemistry Section, Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Daniel Ocampo
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Michael Roemelt
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Kiyoung Park
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Korea
- Department of Chemistry, Chung-Ang University, Seoul 06974, Korea
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science, Daejeon 34141, Korea
| | - Jason Shearer
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Kallol Ray
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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4
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Bera M, Kaur S, Keshari K, Moonshiram D, Paria S. Characterization of Reaction Intermediates Involved in the Water Oxidation Reaction of a Molecular Cobalt Complex. Inorg Chem 2022; 61:21035-21046. [PMID: 36517453 DOI: 10.1021/acs.inorgchem.2c03559] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Molecular cobalt(III) complexes of bis-amidate-bis-alkoxide ligands, (Me4N)[CoIII(L1)] (1) and (Me4N)[CoIII(L2)] (2), are synthesized and assessed through a range of characterization techniques. Electrocatalytic water oxidation activity of the Co complexes in a 0.1 M phosphate buffer solution revealed a ligand-centered 2e-/1H+ transfer event at 0.99 V followed by catalytic water oxidation (WO) at an onset overpotential of 450 mV. By contrast, 2 reveals a ligand-based oxidation event at 0.9 V and a WO onset overpotential of 430 mV. Constant potential electrolysis study and rinse test experiments confirm the homogeneous nature of the Co complexes during WO. The mechanistic investigation further shows a pH-dependent change in the reaction pathway. On the one hand, below pH 7.5, two consecutive ligand-based oxidation events result in the formation of a CoIII(L2-)(OH) species, which, followed by a proton-coupled electron transfer reaction, generates a CoIV(L2-)(O) species that undergoes water nucleophilic attack to form the O-O bond. On the other hand, at higher pH, two ligand-based oxidation processes merge together and result in the formation of a CoIII(L2-)(OH) complex, which reacts with OH- to yield the O-O bond. The ligand-coordinated reaction intermediates involved in the WO reaction are thoroughly studied through an array of spectroscopic techniques, including UV-vis absorption spectroscopy, electron paramagnetic resonance, and X-ray absorption spectroscopy. A mononuclear CoIII(OH) complex supported by the one-electron oxidized ligand, [CoIII(L3-)(OH)]-, a formal CoIV(OH) complex, has been characterized, and the compound was shown to participate in the hydroxide rebound reaction, which is a functional mimic of Compound II of Cytochrome P450.
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Affiliation(s)
- Moumita Bera
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, India
| | - Simarjeet Kaur
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, India
| | - Kritika Keshari
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, India
| | - Dooshaye Moonshiram
- Consejo Superior de Investigaciones Científicas, Instituto de Ciencia de Materiales de Madrid, Sor Juana Inés de la Cruz, 3, 28049Madrid, Spain
| | - Sayantan Paria
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, India
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5
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Gond M, Pandey SK, Chaudhari U, Sonker P, Bharty M, Ganesan V, Prashanth B, Singh S. Synthesis, crystal structures and electrocatalytic water oxidation by Mn(II), Co(II) and Ni(II) complexes of thiophene-2-carbohydrazide. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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6
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Wang D, Groves JT. Energy Landscape for the Electrocatalytic Oxidation of Water by a Single-Site Oxomanganese(V) Porphyrin. Inorg Chem 2022; 61:13667-13672. [PMID: 35993714 DOI: 10.1021/acs.inorgchem.2c02284] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A cationic manganese porphyrin, MnIII-TDMImP, is an efficient, homogeneous, single-site water oxidation electrocatalyst at neutral pH. The measured turnover frequency for oxygen production is 32 s-1. Mechanistic analyses indicate that MnV(O)(OH2), the protonated form of the corresponding trans-MnV(O)2 species, is generated from the MnIII(OH2)2 precursor in a 2-e- two-proton process and is responsible for O-O bond formation with a H2O molecule. Chloride ion is a competitive substrate with H2O for the MnV(O)(OH2) oxidant, forming hypochlorous acid with a rate constant that is 3 orders of magnitude larger than that of water oxidation. The data allow the construction of an experimental energy landscape for this water oxidation catalysis process.
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Affiliation(s)
- Dong Wang
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - John T Groves
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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7
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Su Y, Luo W, Lin W, Su Y, Li Z, Yuan Y, Li J, Chen G, Li Z, Yu Z, Zou Z. A Water‐Soluble Highly Oxidizing Cobalt Molecular Catalyst Designed for Bioinspired Water Oxidation. Angew Chem Int Ed Engl 2022; 61:e202201430. [DOI: 10.1002/anie.202201430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Yun‐Fei Su
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Wen‐Zhi Luo
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Wang‐Qiang Lin
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Yi‐Bing Su
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zi‐Jian Li
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Yong‐Jun Yuan
- College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou Zhejiang 310018 P. R. China
| | - Jian‐Feng Li
- College of Materials Science and Optoelectronic Technology CAS Center for Excellence in Topological Quantum Computation Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences, Yanqi Lake, Huairou District Beijing 101408 P. R. China
| | - Guang‐Hui Chen
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Zhaosheng Li
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zhen‐Tao Yu
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zhigang Zou
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
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8
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Boer DD, Siberie Q, Siegler MA, Ferber TH, Moritz DC, Hofmann JP, Hetterscheid DGH. On the Homogeneity of a Cobalt-Based Water Oxidation Catalyst. ACS Catal 2022; 12:4597-4607. [PMID: 35465245 PMCID: PMC9016703 DOI: 10.1021/acscatal.2c01299] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 03/21/2022] [Indexed: 01/01/2023]
Abstract
![]()
The homogeneity of
molecular Co-based water oxidation catalysts
(WOCs) has been a subject of debate over the last 10 years as assumed
various homogeneous Co-based WOCs were found to actually form CoOx under operating conditions. The homogeneity
of the Co(HL) (HL = N,N-bis(2,2′-bipyrid-6-yl)amine) system was investigated
with cyclic voltammetry, electrochemical quartz crystal microbalance,
and X-ray photoelectron spectroscopy. The obtained experimental results
were compared with heterogeneous CoOx.
Although it is shown that Co(HL) interacts with the electrode
during electrocatalysis, the formation of CoOx was not observed. Instead, a molecular deposit of Co(HL) was found to be formed on the electrode surface. This study
shows that deposition of catalytic material is not necessarily linked
to the decomposition of homogeneous cobalt-based water oxidation catalysts.
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Affiliation(s)
- Daan den Boer
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, RA, Leiden 2300, The Netherlands
| | - Quentin Siberie
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, RA, Leiden 2300, The Netherlands
| | - Maxime A. Siegler
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore 21218 Maryland, United States
| | - Thimo H. Ferber
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, Darmstadt 64287, Germany
| | - Dominik C. Moritz
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, Darmstadt 64287, Germany
| | - Jan P. Hofmann
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Otto-Berndt-Strasse 3, Darmstadt 64287, Germany
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9
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Su Y, Luo W, Lin W, Su Y, Li Z, Yuan Y, Li J, Chen G, Li Z, Yu Z, Zou Z. A Water‐Soluble Highly Oxidizing Cobalt Molecular Catalyst Designed for Bioinspired Water Oxidation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202201430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yun‐Fei Su
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Wen‐Zhi Luo
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Wang‐Qiang Lin
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Yi‐Bing Su
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zi‐Jian Li
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Yong‐Jun Yuan
- College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou Zhejiang 310018 P. R. China
| | - Jian‐Feng Li
- College of Materials Science and Optoelectronic Technology CAS Center for Excellence in Topological Quantum Computation Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences, Yanqi Lake, Huairou District Beijing 101408 P. R. China
| | - Guang‐Hui Chen
- Department of Chemistry Shantou University Guangdong 515063 P. R. China
| | - Zhaosheng Li
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zhen‐Tao Yu
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
| | - Zhigang Zou
- National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China
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10
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Bharty MK, Singh A, Bharati P, Pandey SK, Singh DK, Ganesan V, Verma PK, Acharya A, Bharti A, Butcher RJ. Electrocatalytic oxygen evolution and antiproliferative activity of Co(III) complexes stabilized by in situ generated
bis
(5‐furan/phenyl‐1,2,4‐triazole)‐3‐sulfinamide. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Aarti Singh
- Department of Chemistry Banaras Hindu University Varanasi India
| | - Pooja Bharati
- Department of Chemistry Banaras Hindu University Varanasi India
| | | | | | | | | | - Arvind Acharya
- Department of Zoology Banaras Hindu University Varanasi India
| | - Akhilesh Bharti
- Department of Chemistry, Kirori Mal college Delhi University Delhi India
| | - Ray J. Butcher
- Department of Chemistry Howard University Washington DC USA
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11
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Zheng H, Ye H, Xu T, Zheng K, Xie X, Zhu B, Wang X, Lin J, Ruan Z. Electrochemical water oxidation catalyzed by a mononuclear cobalt complex of a pentadentate ligand: the critical effect of the borate anion. NEW J CHEM 2022. [DOI: 10.1039/d2nj01154a] [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
A cobalt complex is found as a homogeneous water oxidation electrocatalyst. Electrochemical examinations indicate that the implementation of proton-couple electron transfer process and formation of O–O bond are assisted by borate anion.
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Affiliation(s)
- Haixia Zheng
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
| | - Hui Ye
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
| | - Tao Xu
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
| | - Kaibo Zheng
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China
| | - Xinyi Xie
- Institute for New Energy Materials & Low Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Binghui Zhu
- Institute for New Energy Materials & Low Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Xichao Wang
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
| | - Junqi Lin
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
| | - Zhijun Ruan
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China
- Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, China
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12
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Chaurasia R, Pandey SK, Singh DK, Bharty MK, Ganesan V, Hira SK, Manna PP, Bharti A, Butcher RJ. Antiproliferative activity and electrochemical oxygen evolution by Ni(II) complexes of N'-(aroyl)-hydrazine carbodithioates. Dalton Trans 2021; 50:14362-14373. [PMID: 34568879 DOI: 10.1039/d1dt02285g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The electrochemical water splitting by transition metal complexes is emerging very rapidly. The nickel complexes also play a very vital role in various biological activities. Here, three new ligands {H2mbhce = N'-(4-methyl-benzoyl), H2pchce = N'-(pyridine-carbonyl) and H2hbhce = N'-(2-hydroxy-benzoyl) hydrazine carbodithioic acid ethyl ester} and their corresponding Ni(II) complexes [Ni(Hmbhce)2(py)2] (1), [Ni(pchce)(o-phen)2]·CH3OH·H2O (2) and [Ni(hbhce)(o-phen)2]·1.75CHCl3·H2O (3) have been synthesized and fully characterized by various physicochemical and X-ray crystallography techniques. The photoluminescence study and thermal degradations were also examined. The treatment of K562 cells with the increasing concentrations of the nickel salts, ligands, and complexes 1, 2, and 3 showed dose-dependent cytotoxicity. The cytotoxic activity of ligands reveals that ligand H2mbhce is more potent in inhibiting the growth of tumor cells in comparison to other ligands H2pbhce and H2hbhce. Cytotoxicity assay results indicate that all complexes have remarkable cytotoxic potential in comparison to either nickel salts or the free ligands. Among these complexes, complex 1 has significantly better anti-tumor activity as compared to complexes 2 and 3. The electrochemical study of complexes 1, 2, and 3 for water oxidation reveals that all the complexes possess admirable electrocatalytic activity towards oxygen evolution reaction (OER) and have lower overpotential (328, 338, and 370 mV, respectively) than many previously reported complexes and RuO2 (390 mV). Among complexes 1, 2, and 3, complex-2 shows a better water oxidation response. Consequently, these complexes have great potential to be utilized in fuel cells. The more reliable electrochemical parameter TOF is also calculated for all three complexes.
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Affiliation(s)
- R Chaurasia
- Department of Chemistry, Banaras Hindu University, Varanasi-221005, India.
| | | | - Devesh Kumar Singh
- Department of Chemistry, Banaras Hindu University, Varanasi-221005, India.
| | - M K Bharty
- Department of Chemistry, Banaras Hindu University, Varanasi-221005, India.
| | | | - S K Hira
- Department of Zoology, Banaras Hindu University, Varanasi-221005, India
| | - P P Manna
- Department of Zoology, Banaras Hindu University, Varanasi-221005, India
| | - A Bharti
- Department of chemistry, Kirori Mal College, University of Delhi, Delhi-110007, India
| | - Ray J Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
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Dey A, Guha A, Kumar V, Bawari S, Narayanan TN, Chandrasekhar V. Facile water oxidation by dinuclear mixed-valence Co III/Co II complexes: the role of coordinated water. Dalton Trans 2021; 50:14257-14263. [PMID: 34553710 DOI: 10.1039/d1dt01910d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rational design of a catalyst using earth abundant transition metals that can facilitate the smooth O-O bond formation is crucial for developing efficient water oxidation catalysts. The coordination environment around the metal ion of the catalyst plays a pivotal role in this context. We have chosen dinuclear mixed-valence CoIIICoII complexes of the general formula of [CoIIICoII(LH2)2(X)(H2O)] (X = OAc or Cl) which bear a coordinated water molecule in the primary coordination sphere. We anticipated that the water molecule in the primary sphere can take part in the proton coupled electron transfer (PCET) mechanism which can accelerate the facile formation of the O-O bond under strong alkaline conditions (1 M NaOH). To understand the role of the coordinated water molecule we have generated an analogous complex, [CoIIICoII(LH2)2(o-vanillin)] (o-vanillin = 2-hydroxy-3-methoxybenzaldehyde), without coordinated water. Interestingly, we have found that the water coordinated complexes show better oxygen evolution reaction (OER) activity and stability.
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Affiliation(s)
- Atanu Dey
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | - Anku Guha
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | - Vierandra Kumar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | - Sumit Bawari
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | | | - Vadapalli Chandrasekhar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India. .,Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
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Cabelof AC, Carta V, Chen C, Pink M, Caulton KG. Pincers with diverse donors and their interconversion: application to Ni(II). Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alyssa C. Cabelof
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN, 47401 USA
| | - Veronica Carta
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN, 47401 USA
| | - Chun‐Hsing Chen
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN, 47401 USA
| | - Maren Pink
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN, 47401 USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN, 47401 USA
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