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Das K, Beyene BB, Massera C, Garribba E, El Fallah MS, Frontera A, Hung CH, Datta A. Magnetic study and DFT analysis of a doubly carboxylato-bridged Co(II) derivative anchored with a 'scorpionate' precursor as a potential electrocatalyst for heterogeneous H 2 evolution. Dalton Trans 2024; 53:9358-9368. [PMID: 38757183 DOI: 10.1039/d4dt00807c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
A new doubly carboxylato-bridged Co(II) dinuclear complex, [Co(bdtbpza)(NCS)]2 (1), was obtained in a satisfactory yield by employing a 'scorpionate'-type precursor, bdtbpza {bis-(3,5-di-tert-butylpyrazol-1-yl)acetate}, and was then structurally characterized. Single-crystal X-ray diffraction analysis revealed that, in 1, each Co(II) is penta-coordinated, leading to a distorted trigonal-bipyramidal geometry within the coordination environment of N3O2. Weak antiferromagnetic coupling within the Co(II) ions in 1 was found based on the isotropic spin Hamiltonian H = -J(S1·S2) for the Si = 3/2 system. For evaluating the spin density distribution and the mechanism for the magnetic exchange coupling, DFT analysis was performed, with the calculated result agreeing the experimental magnetic data. A study into electrochemical H2 evolution, involving cyclic voltammetry (CV), controlled potential electrolysis (CPE), and gas chromatographic (GC) analyses of the graphite electrode modified with the cobalt complex in a neutral aqueous solution revealed the high catalytic activity of the complex with a low overpotential toward H2O reduction. The faradaic efficiency of the catalyst was found to be 83.7% and the di-cobalt catalyst-modified electrode displayed quite an interesting H2-evolution activity compared with that of bare electrodes. These results are encouraging for the future potential application of 1 in water splitting.
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Affiliation(s)
- Kuheli Das
- Department of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata - 700009, India
- Institute of Chemistry, Academia Sinica, Nankang - 115, Taipei, Taiwan.
| | - Belete B Beyene
- Department of Chemistry, Bahir Dar University, P.O. Box 79, Bahir Dar, Ethiopia
- Institute of Chemistry, Academia Sinica, Nankang - 115, Taipei, Taiwan.
| | - Chiara Massera
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università degli Studi di Parma, Viale delle Scienze 17/A, 43124 Parma, Italy
| | - Eugenio Garribba
- Dipartimento di Medicina, Chirurgia e Farmacia, Università di Sassari, Viale San Pietro, I-07100 Sassari, Italy
| | - M S El Fallah
- Departament de Química Inorgànica i Orgànica, Secció Inorgànica and Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Martí i Franquès, 1-11, 08028-Barcelona, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Chen-Hsiung Hung
- Institute of Chemistry, Academia Sinica, Nankang - 115, Taipei, Taiwan.
| | - Amitabha Datta
- Institute of Chemistry, Academia Sinica, Nankang - 115, Taipei, Taiwan.
- Department of Chemistry, National Changhua University of Education, Changhua - 50058, Taiwan
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Yang H, Du J, Wang CL, Zhan SZ. Synthesis, structures, characterizations and catalytic behaviors for hydrogen evolution of copper(II) and copper(I) complexes supported by diiminodiphosphines. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Reactivity and Mechanism of Photo- and Electrocatalytic Hydrogen Evolution by a Diimine Copper(I) Complex. Catalysts 2020. [DOI: 10.3390/catal10111302] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The tetrahedral copper(I) diimine complex [Cu(pq)2]BF4 displays high photocatalytic activity for the H2 evolution reaction with a turnover number of 3564, thus representing the first type of a Cu(I) quinoxaline complex capable of catalyzing proton reduction. Electrochemical experiments indicate that molecular mechanisms prevail and DFT calculations provide in-depth insight into the catalytic pathway, suggesting that the coordinating nitrogens play crucial roles in proton exchange and hydrogen formation.
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Synthesis, characterization and antimicrobial properties of mononuclear copper(II) compounds of N,N′-di(quinolin-8-yl)cyclohexane-1,2-diamine. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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