Synthesis, characterization, magnetic anisotropy and catalytic behaviors of a cobalt complex of S,S′-bis(2-pyridylmethyl)-1,2-thiobenzene

[(bptb)CoBr2], a catalyst for electrochemical and photochemical driven hydrogen evolution with high efficiency. [Display omitted] •[(bptb)CoBr2] is formed by the reaction of CoBr2 and the ligand, bptb.•[(bptb)CoBr2] exhibits magnetic anisotropy with a ZFS parameter (D) of 69.88 cm−1.•[(bptb)CoBr2] c...

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Published in:Inorganica Chimica Acta 2020-04, Vol.503, p.119400, Article 119400
Main Authors: Liu, Wei-Xia, Xie, Zhen-Lang, Zhan, Jun-Zheng, Zhan, Shu-Zhong, Wu, Song-Ping
Format: Article
Language:English
Subjects:
Ascorbic acid
Catalysts
Chemical synthesis
Cobalt complex
Cobalt compounds
Crystal structure
Crystallography
Electro and photocatalytic activities for hydrogen evolution
Hydrogen evolution
Magnetic anisotropy
Nanorods
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Summary:[(bptb)CoBr2], a catalyst for electrochemical and photochemical driven hydrogen evolution with high efficiency. [Display omitted] •[(bptb)CoBr2] is formed by the reaction of CoBr2 and the ligand, bptb.•[(bptb)CoBr2] exhibits magnetic anisotropy with a ZFS parameter (D) of 69.88 cm−1.•[(bptb)CoBr2] can provide 19,290 mol H2 (mol of cat)−1 during 80 h irradiation. S,S′-bis(2-pyridylmethyl)-1,2-thiobenzene (bptb) reacts with CoBr2 to form a cobalt complex, [(bptb)CoBr2]. Its structure has been determined by X-ray crystallography. Studies show that [(bptb)CoBr2] can act as both a single-molecule magnet and a molecular catalyst. As a single-molecule magnet, magnetic anisotropy for [(bptb)CoBr2] is revealed via the analyses of the direct-current magnetic data with a zero-field splitting (ZFS) parameter (D) of 69.88 cm−1. Catalytic activities for hydrogen evolution from water are found. As an electrocatalyst, [(bptb)CoBr2] can provide 870 mol of hydrogen per mole of catalyst per hour (mol H2/mol catalyst/h) at an overpotential (OP) of 837.6 mV. As a photocatalyst, mixing with CdS nanorods (CdS NRs) as a photosensitizer, and ascorbic acid (H2A) as a sacrificial electron donor, [(bptb)CoBr2] can afford 19290 mol H2 per mole of catalyst during 80 h irradiation. The highest apparent quantum yield (AQY) is ~24.30%.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2019.119400