Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production
In this article, we investigate the encapsulation of K<sub>2</sub>[Ni(maleonitriledithiolate)<sub>2</sub>] (<b>1</b>) within a host molecule, β-cyclodextrin (β-CD), via single-crystal X-ray analysis. An inclusion complex, K<sub>2</sub>{[Ni(maleonitrile...
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2024-12-01
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| author | Tomohiko Hamaguchi Yuudai Iseki Ryuta Ishikawa Akio Mishima Satoshi Kawata |
| author_facet | Tomohiko Hamaguchi Yuudai Iseki Ryuta Ishikawa Akio Mishima Satoshi Kawata |
| author_sort | Tomohiko Hamaguchi |
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| description | In this article, we investigate the encapsulation of K<sub>2</sub>[Ni(maleonitriledithiolate)<sub>2</sub>] (<b>1</b>) within a host molecule, β-cyclodextrin (β-CD), via single-crystal X-ray analysis. An inclusion complex, K<sub>2</sub>{[Ni(maleonitriledithiolate)<sub>2</sub>]@(β-CD)<sub>2</sub>} (<b>2</b>), was constructed from <b>1</b> and two β-CDs. The anion guest Ni complex included a host cavity, constructed using two β-CDs, and the Ni atom of the anion was located between the two hydrophilic primary rims. Ultraviolet-visible absorption spectroscopy revealed that inclusion complex <b>2</b> exhibited a 2:1 (host:guest) stoichiometry in the solution, which is consistent with the result obtained from X-ray crystallography. The association of the host and guest occurred in two steps, and the association constants for the first and second steps were 1.1(7) × 10<sup>4</sup> and 1.8(5) × 10<sup>4</sup> mol<sup>−1</sup> dm<sup>3</sup>, respectively. The catalytic behavior of <b>1</b> and <b>2</b> was investigated for electrochemical hydrogen production in the aqueous solution of an acetate buffer (pH = 4.72). During the catalytic reaction, inclusion complex <b>2</b> was observed to have a better catalytic reaction rate than <b>1</b>. The study findings provide insights into the effects of the encapsulation of guest molecules within host structures. |
| format | Article |
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| issn | 1420-3049 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj-art-c2f3f1b1cf604fedbbee3fc381d4ff8d2025-08-20T02:43:42ZengMDPI AGMolecules1420-30492024-12-012924585810.3390/molecules29245858Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen ProductionTomohiko Hamaguchi0Yuudai Iseki1Ryuta Ishikawa2Akio Mishima3Satoshi Kawata4Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanDepartment of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanDepartment of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanDepartment of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanDepartment of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanIn this article, we investigate the encapsulation of K<sub>2</sub>[Ni(maleonitriledithiolate)<sub>2</sub>] (<b>1</b>) within a host molecule, β-cyclodextrin (β-CD), via single-crystal X-ray analysis. An inclusion complex, K<sub>2</sub>{[Ni(maleonitriledithiolate)<sub>2</sub>]@(β-CD)<sub>2</sub>} (<b>2</b>), was constructed from <b>1</b> and two β-CDs. The anion guest Ni complex included a host cavity, constructed using two β-CDs, and the Ni atom of the anion was located between the two hydrophilic primary rims. Ultraviolet-visible absorption spectroscopy revealed that inclusion complex <b>2</b> exhibited a 2:1 (host:guest) stoichiometry in the solution, which is consistent with the result obtained from X-ray crystallography. The association of the host and guest occurred in two steps, and the association constants for the first and second steps were 1.1(7) × 10<sup>4</sup> and 1.8(5) × 10<sup>4</sup> mol<sup>−1</sup> dm<sup>3</sup>, respectively. The catalytic behavior of <b>1</b> and <b>2</b> was investigated for electrochemical hydrogen production in the aqueous solution of an acetate buffer (pH = 4.72). During the catalytic reaction, inclusion complex <b>2</b> was observed to have a better catalytic reaction rate than <b>1</b>. The study findings provide insights into the effects of the encapsulation of guest molecules within host structures.https://www.mdpi.com/1420-3049/29/24/5858Ni complexcyclodextrininclusionelectrochemistryhydrogen evolution reaction |
| spellingShingle | Tomohiko Hamaguchi Yuudai Iseki Ryuta Ishikawa Akio Mishima Satoshi Kawata Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production Molecules Ni complex cyclodextrin inclusion electrochemistry hydrogen evolution reaction |
| title | Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production |
| title_full | Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production |
| title_fullStr | Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production |
| title_full_unstemmed | Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production |
| title_short | Structure of Ni(II) Inclusion Complex in Solid/Solution States and the Enhancement of Catalytic Behavior in Electrochemical Hydrogen Production |
| title_sort | structure of ni ii inclusion complex in solid solution states and the enhancement of catalytic behavior in electrochemical hydrogen production |
| topic | Ni complex cyclodextrin inclusion electrochemistry hydrogen evolution reaction |
| url | https://www.mdpi.com/1420-3049/29/24/5858 |
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