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Papanikolaou M, Hadjithoma S, Keramidas O, Drouza C, Amoiridis A, Themistokleous A, Hayes SC, Miras HN, Lianos P, Tsipis AC, Kabanos TA, Keramidas AD. Experimental and Theoretical Investigation of the Mechanism of the Reduction of O 2 from Air to O 22- by V IVO 2+- N, N, N-Amidate Compounds and Their Potential Use in Fuel Cells. Inorg Chem 2024; 63:3229-3249. [PMID: 38317481 PMCID: PMC10880062 DOI: 10.1021/acs.inorgchem.3c03272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 02/07/2024]
Abstract
The two-electron reductive activation of O2 to O22- is of particular interest to the scientific community mainly due to the use of peroxides as green oxidants and in powerful fuel cells. Despite of the great importance of vanadium(IV) species to activate the two-electron reductive activation of O2, the mechanism is still unclear. Reaction of VIVO2+ species with the tridentate-planar N,N,N-carboxamide (ΗL) ligands in solution (CH3OH:H2O) under atmospheric O2, at room temperature, resulted in the quick formation of [VV(═O)(η2-O2)(κ3-L)(H2O)] and cis-[VV(═O)2(κ3-L)] compounds. Oxidation of the VIVO2+ complexes with the sterically hindered tridentate-planar N,N,N-carboxamide ligands by atmospheric O2 gave only cis-[VV(═O)2(κ3-L)] compounds. The mechanism of formation of [VV(═O)(η2-O2)(κ3-L)(H2O)] (I) and cis-[VV(═O)2(κ3-L)] (II) complexes vs time, from the interaction of [VIV(═O)(κ3-L)(Η2Ο)2]+ with atmospheric O2, was investigated with 51V, 1H NMR, UV-vis, cw-X-band EPR, and 18O2 labeling IR and resonance Raman spectroscopies revealing the formation of a stable intermediate (Id). EPR, MS, and theoretical calculations of the mechanism of the formation of I and II revealed a pathway, through a binuclear [VIV(═O)(κ3-L)(H2O)(η1,η1-O2)VIV(═O)(κ3-L)(H2O)]2+ intermediate. The results from cw-EPR, 1H NMR spectroscopies, cyclic voltammetry, and the reactivity of the complexes [VIV(═O)(κ3-L)(Η2Ο)2]+ toward O2 reduction fit better to an intermediate with a binuclear nature. Dynamic experiments in combination with computational calculations were undertaken to fully elucidate the mechanism of the O2 reduction to O22- by [VIV(═O)(κ3-L)(Η2Ο)2]+. The galvanic cell {Zn|VIII,VII||Id, [VIVO(κ3-L)(H2O)2]+|O2|C(s)} was manufactured, demonstrating the important applicability of this new chemistry to Zn|H2O2 fuel cells technology generating H2O2 in situ from the atmospheric O2.
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Affiliation(s)
| | - Sofia Hadjithoma
- Department
of Chemistry, University of Cyprus, Nicosia 2109, Cyprus
| | | | - Chryssoula Drouza
- Department
of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Limassol 3036, Cyprus
| | | | | | - Sofia C. Hayes
- Department
of Chemistry, University of Cyprus, Nicosia 2109, Cyprus
| | - Haralampos N. Miras
- School
of Chemistry, The University of Glasgow, Glasgow G12 8QQ, U.K.
- Department
of Chemical Engineering, University of Patras, 26500 Patras, Greece
| | - Panagiotis Lianos
- Department
of Chemical Engineering, University of Patras, 26500 Patras, Greece
| | - Athanassios C. Tsipis
- Section
of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
| | - Themistoklis A. Kabanos
- Section
of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
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Anil Kumar HG, Mohan Kumar TM, Divakara TR, Geetha D, Yathirajan HS, Parkin S. Crystal structure studies and Hirshfeld surface analysis of 4-(di-methyl-aza-nium-yl)-2-hy-droxy-anilinium dichloride monohydrate at 90 K. Acta Crystallogr E Crystallogr Commun 2023; 79:827-830. [PMID: 37693672 PMCID: PMC10483561 DOI: 10.1107/s2056989023007223] [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: 08/14/2023] [Accepted: 08/16/2023] [Indexed: 09/12/2023]
Abstract
The crystal structure and a Hirshfeld surface analysis of the substituted anilinium salt 4-(di-methyl-aza-nium-yl)-2-hy-droxy-anilinium dichloride monohydrate, C8H14N2O+·2Cl-·H2O, at low temperature (90 K) are presented. The organic cation is essentially planar: the r.m.s. deviation of its non-hydrogen atoms (aside from the two methyl groups) is 0.0045 Å. The methyl carbons are 1.3125 (12) Å and 1.1278 (12) Å either side of the mean plane. The crystal packing involves extensive hydrogen bonding of types O-H⋯Cl, N-H⋯Cl, N-H⋯OW, and OW-HW⋯Cl (where W = water), which arrange into chains of R 2 4(12) motifs that combine to form corrugated layers parallel to (10). Atom-atom contacts for the cation primarily involve hydrogen, leading to the most abundant coverage percentages being 51.3% (H⋯H), 23.0% (H⋯Cl), 12.9% (H⋯O), and 9.7% (C⋯H).
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Affiliation(s)
- Haleyur G. Anil Kumar
- Department of Science and Humanities, PES University, BSK III Stage, Bengaluru-560 085, India
| | - Thaluru M. Mohan Kumar
- Department of Chemistry, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru-560 035, India
| | | | - Doreswamy Geetha
- Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysuru-570 006, India
| | - Hemmige S. Yathirajan
- Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysuru-570 006, India
| | - Sean Parkin
- Department of Chemistry, University of Kentucky, Lexington, KY, 40506-0055, USA
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Keramidas AD, Hadjithoma S, Drouza C, Andrade TS, Lianos P. Four electron selective O 2 reduction by a tetranuclear vanadium(IV/V)/hydroquinonate catalyst: application in the operation of Zn–air batteries. NEW J CHEM 2022. [DOI: 10.1039/d1nj03626b] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A tetranuclear vanadium(IV/V) hydroquinonate electrocatalyst for oxygen reduction through proton-coupled electron transfer. The complex enhances the current and power of Zn–air batteries.
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Affiliation(s)
| | - Sofia Hadjithoma
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus
| | - Chryssoula Drouza
- Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Limassol 3036, Cyprus
| | | | - Panagiotis Lianos
- Department of Chemical Engineering, University of Patras, 26500 Patras, Greece
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Synthesis, structural and physicochemical properties of a series of manganese(II) complexes with a novel N5 tripodal-amidate ligand and their potential use as water oxidation catalysts. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abate A, Correa-Baena JP, Saliba M, Su'ait MS, Bella F. Perovskite Solar Cells: From the Laboratory to the Assembly Line. Chemistry 2017; 24:3083-3100. [DOI: 10.1002/chem.201704507] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Indexed: 01/21/2023]
Affiliation(s)
- Antonio Abate
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Hahn-Meitner-Platz 1 14109 Berlin Germany
| | - Juan-Pablo Correa-Baena
- MIT Photovoltaic Research Laboratory; Massachusetts Institute of Technology; 77 Massachusetts Ave 02139 Cambridge USA
| | - Michael Saliba
- Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne (EPFL); Station 3 1015 Lausanne Switzerland
| | - Mohd Sukor Su'ait
- Solar Energy Research Institute; Universiti Kebangsaan Malaysia; 43600 Bangi Malaysia
| | - Federico Bella
- GAME Lab, Department of Applied Science and Technology DISAT; Politecnico di Torino; Corso Duca degli Abruzzi 24 10129 Torino Italy
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