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Li X, Zhang Y, Shi Z, Wang D, Yang H, Zhang Y, Qin H, Lu W, Chen J, Li Y, Qing G. Water-stable boroxine structure with dynamic covalent bonds. Nat Commun 2024; 15:1207. [PMID: 38331926 PMCID: PMC10853236 DOI: 10.1038/s41467-024-45464-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 01/25/2024] [Indexed: 02/10/2024] Open
Abstract
Boroxines are significant structures in the production of covalent organic frameworks, anion receptors, self-healing materials, and others. However, their utilization in aqueous media is a formidable task due to hydrolytic instability. Here we report a water-stable boroxine structure discovered from 2-hydroxyphenylboronic acid. We find that, under ambient environments, 2-hydroxyphenylboronic acid undergoes spontaneous dehydration to form a dimer with dynamic covalent bonds and aggregation-induced enhanced emission activity. Intriguingly, upon exposure to water, the dimer rapidly transforms into a boroxine structure with excellent pH stability and water-compatible dynamic covalent bonds. Building upon these discoveries, we report the strong binding capacity of boroxines toward fluoride ions in aqueous media, and develop a boroxine-based hydrogel with high acid-base stability and reversible gel-sol transition. This discovery of the water-stable boroxine structure breaks the constraint of boroxines not being applicable in aqueous environments, opening a new era of researches in boroxine chemistry.
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Affiliation(s)
- Xiaopei Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
- Instrumental Analysis Center, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, P. R. China
| | - Yongjie Zhang
- Instrumental Analysis Center, School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, P. R. China
| | - Zhenqiang Shi
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Dongdong Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Hang Yang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Yahui Zhang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Haijuan Qin
- Research Centre of Modern Analytical Technology, Tianjin University of Science & Technology, Tianjin, P. R. China
| | - Wenqi Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Junjun Chen
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Yan Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Guangyan Qing
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China.
- College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan, P. R. China.
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Ono K, Sawanaga K, Onodera S, Kawai H, Goto K. Structural Interconversion Based on Intramolecular Boroxine Formation. Chemistry 2023; 29:e202300995. [PMID: 37092863 DOI: 10.1002/chem.202300995] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/23/2023] [Accepted: 04/24/2023] [Indexed: 04/25/2023]
Abstract
A novel structural interconversion unit based on intramolecular boroxine formation has been developed. A macrocyclic triboronic acid consisting of three phenylboronic acid units linked by covalent linkers preferentially underwent intramolecular rather than intermolecular boroxine formation, resulting in a quantitative formation of tricyclic boroxine. This structural transformation was accompanied by changes in the polarity, flexibility, and size of the molecule. Dynamic interconversion between the macrocyclic triboronic acid and the tricyclic boroxine was achieved by simple heating/cooling, whereas no boroxine formation occurred upon heating when three boronic acid units were not connected by linkers. Thermodynamic analysis revealed that the entropic advantage of the intramolecular boroxine formation process resulted in these unique features. The entropically stabilized tricyclic boroxine also shows high stability with respect to hydrolysis.
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Affiliation(s)
- Kosuke Ono
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Keisuke Sawanaga
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Satoru Onodera
- Department of Chemistry, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Hidetoshi Kawai
- Department of Chemistry, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Kei Goto
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
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Ono K, Tanaka Y, Sugimoto K, Kinubari S, Kawai H. Endo-Functionalized Cyclic Oligophenylenes: Synthesis and Complexation with a Chiral Phosphoric Acid. ACS OMEGA 2022; 7:45347-45352. [PMID: 36530312 PMCID: PMC9753635 DOI: 10.1021/acsomega.2c05926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/07/2022] [Indexed: 06/17/2023]
Abstract
The synthesis of endo-functionalized cyclic oligophenylenes in which adjacent benzene rings are perpendicular to one another is described. Annulation precursors, OH- or NH2-functionalized quinquephenyl diboronic acids, and septiphenyl dibromo compounds were systematically prepared by using a diprotected biphenyl-3,4'-diyl diboronic acid as a key compound. Four endo-functionalized cyclic oligophenylenes were synthesized by annulation of the precursors in dilute conditions through Suzuki-Miyaura cross-coupling. X-ray analysis of the macrocycle revealed the unique 1D channel packing structure formed by connecting the nanometer-sized cavity of the macrocycle. Furthermore, NH2-functionalized macrocycles could bind a chiral phosphoric acid in the cavity in CDCl3 solution.
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Affiliation(s)
- Kosuke Ono
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Yusei Tanaka
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Kana Sugimoto
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Shigemi Kinubari
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Hidetoshi Kawai
- Department
of Chemistry, Faculty of Science, Tokyo
University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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Ono K, Onodera S, Kawai H. Boroxine template for macrocyclization and postfunctionalization. Chem Commun (Camb) 2022; 58:12544-12547. [DOI: 10.1039/d2cc04691a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Boroxine-templated macrocyclization: Olefin metathesis of boronic acid substrates in the presence of MS4A followed by workup with pinacol yields the desired macrocyclic compounds with modifiable three boron units.
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Affiliation(s)
- Kosuke Ono
- School of Science, Tokyo Institute of Technology, O-okayama Meguro-ku, Tokyo 152-8551, Japan
| | - Satoru Onodera
- Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Hidetoshi Kawai
- Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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