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Drosou M, Zarkadoulas A, Bethanis K, Mitsopoulou CA. Structural modifications on nickel dithiolene complexes lead to increased metal participation in the electrocatalytic hydrogen evolution mechanism. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1918339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Maria Drosou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
| | - Athanasios Zarkadoulas
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
| | - Kostas Bethanis
- Physics Laboratory, Department of Biotechnology, Agricultural University of Athens, Athens, Greece
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Athens, Greece
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Synthesis of Novel Heteroleptic Oxothiolate Ni(II) Complexes and Evaluation of Their Catalytic Activity for Hydrogen Evolution. Catalysts 2021. [DOI: 10.3390/catal11030401] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Two heteroleptic nickel oxothiolate complexes, namely [Ni(bpy)(mp)] (1) and [Ni(dmbpy)(mp)] (2), where mp = 2-hydroxythiophenol, bpy = 2,2′-bipyridine and dmbpy = 4,4′-dimethyl-2,2′-bipyridine were synthesized and characterized with various physical and spectroscopic methods. Complex 2 was further characterized by single crystal X-ray diffraction data. The complex crystallizes in the monoclinic P 21/c system and in its neutral form. The catalytic properties of both complexes for proton reduction were evaluated with photochemical and electrochemical studies. Two different in their nature photosensitizers, namely fluorescein and CdTe-TGA-coated quantum dots, were tested under various conditions. The role of the electron donating character of the methyl substituents was revealed in the light of the studies. Thus, catalyst 2 performs better than 1, reaching 39.1 TONs vs. 4.63 TONs in 3 h, respectively, in electrochemical experiments. In contrast, complex 1 is more photocatalytically active than 2, achieving a TON of over 6700 in 120 h of irradiation. This observed reverse catalytic activity suggests that HER mechanism follows different pathways in electrocatalysis and photocatalysis.
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Zhang W, Lee C, Bushnell EA. Computational investigation of the reaction of nickel-bis(dithiolene) and nickel-bis(diselenolene) complexes with OH. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present study, the reactivity of OH with Ni(X2C2H2)2 and Ni(X2C2H2)2 – (where X = S or Se) was investigated. From the thermodynamics, it found that the OH radical attacks a backbone C atom of the Ni(S2C2H2)2 complex. For the Ni(Se2C2H2)2 complex, the OH is predicted to target the ligating chalcogen atom. The significance of this is that with the attack of OH to a backbone C atom, the thermodynamic cost to lose a proton or hydrogen atom ranges from exergonic to marginally endergonic depending on the oxidation state of the complex. Notably, such a process results in a rearrangement of the complex, likely leading to deactivation of the catalyst. Where OH has attacked a ligating chalcogenide atom, the thermodynamic cost to lose a proton or hydrogen is endergonic regardless of oxidation state of the complex. Where OH attacks a coordinating chalcogenide atom, the thermodynamics for the addition of a proton was considered. At the present level of theory, it was found that for the dithiolene and diselenolene monoanionic complexes, the addition of a proton is marginally endergonic. However, following protonation, the loss of water is significantly exergonic and results in the regeneration of the neutral non-oxidized Ni complex. Given the greater tendency for OH to attack Se versus S, it may be speculated that the use of diselenolene ligands may offer a means to protect the Ni complex from damaging OH radicals due to the thermodynamic tendency for OH to attack Se atom of the diselenolene complexes not seen in the dithiolene complexes.
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Affiliation(s)
- Wenyuan Zhang
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
| | - Changmin Lee
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
| | - Eric A.C. Bushnell
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
- Department of Chemistry, Brandon University, 270-18th Street, Brandon, MB R7A 6A9, Canada
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Singh A, Singh A, Kociok-Köhn G, Molloy KC, Singh AK, Kumar A, Muddassir M. Ni( ii) dithiolate anion composites with two-dimensional materials for electrochemical oxygen evolution reactions (OERs). NEW J CHEM 2021. [DOI: 10.1039/d1nj02644e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A redox active anionic nickel dithiolate complex was synthesized and its composites with GO, rGO and GN were prepared and used as electrocatalyts in the OER.
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Affiliation(s)
- Ayushi Singh
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Amita Singh
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
- Department of Chemistry, Dr. Ram Manohar Lohiya Avadh University, Ayodhya, 224001, India
| | - Gabriele Kociok-Köhn
- Materials and Chemical Characterisation Facility (MC2), University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | | | - Ashish Kumar Singh
- Department of Chemistry, Guru Ghasidas Vishwavidyala, Koni, Bilaspur, 495009, India
| | - Abhinav Kumar
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Mohd. Muddassir
- Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia
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Pitchaimani J, Ni SF, Dang L. Metal dithiolene complexes in olefin addition and purification, small molecule adsorption, H2 evolution and CO2 reduction. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213398] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Drosou M, Kamatsos F, Mitsopoulou CA. Recent advances in the mechanisms of the hydrogen evolution reaction by non-innocent sulfur-coordinating metal complexes. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01113g] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review comments on the homogeneous HER mechanisms for catalysts carrying S-non-innocent ligands in the light of experimental and computational data.
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Affiliation(s)
- Maria Drosou
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
| | - Fotios Kamatsos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- Panepistimiopolis
- Greece
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Koutsouri E, Zarkadoulas A, Kefalidi C, Papatriantafyllopoulou C, Mitsopoulou CA. Establishing Structure–Activity Relationships in Photocatalytic Systems by Using Nickel Bis(dithiolene) Complexes as Proton Reduction Catalysts. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900886] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Eugenia Koutsouri
- Inorganic Chemistry Laboratory Chemistry Department National and Kapodistrian University of Athens Zografou 157 71 Panepistimiopolis Greece
| | - Athanasios Zarkadoulas
- Inorganic Chemistry Laboratory Chemistry Department National and Kapodistrian University of Athens Zografou 157 71 Panepistimiopolis Greece
| | - Christina Kefalidi
- Inorganic Chemistry Laboratory Chemistry Department National and Kapodistrian University of Athens Zografou 157 71 Panepistimiopolis Greece
| | - Constantina Papatriantafyllopoulou
- School of Chemistry National University of Ireland Galway H91 TK 33 Galway Ireland
- Department of Chemistry University of Cyprus 1678 Nicosia Cyprus
| | - Christiana A. Mitsopoulou
- Inorganic Chemistry Laboratory Chemistry Department National and Kapodistrian University of Athens Zografou 157 71 Panepistimiopolis Greece
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Koshiba K, Yamauchi K, Sakai K. Ligand‐Based PCET Reduction in a Heteroleptic Ni(bpy)(dithiolene) Electrocatalyst Giving Rise to Higher Metal Basicity Required for Hydrogen Evolution. ChemElectroChem 2019. [DOI: 10.1002/celc.201900400] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Keita Koshiba
- Department of Chemistry Faculty of ScienceKyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan
| | - Kosei Yamauchi
- Department of Chemistry Faculty of ScienceKyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan
| | - Ken Sakai
- Department of Chemistry Faculty of ScienceKyushu University Motooka 744, Nishi-ku Fukuoka 819-0395 Japan
- 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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