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Dynamic Interconversion between Boroxine Cages Based on Pyridine Ligation |
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| Authors: | Dr Kosuke Ono Shunsuke Shimo Dr Kohei Takahashi Dr Nobuhiro Yasuda Dr Hidehiro Uekusa Prof Nobuharu Iwasawa |
| Institution: | 1. Department of Chemistry, Tokyo Institute of Technology, Tokyo, Japan;2. Present address: Department of Chemistry, Faculty of Science, Tokyo University of Science, Tokyo, Japan;3. Research & Utilization Division, Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, Japan |
| Abstract: | Dynamic interconversion between large covalent organic cages was achieved simply by heating or acid/base treatment. A mixture of the boroxine cages 12‐mer and 15‐mer was cleanly converted into a pyridine adduct of the 9‐mer boroxine cage upon treatment with pyridine, and the geometry of N‐coordinated boron atoms changed from trigonal to tetrahedral. The reverse reaction was achieved by heating or acid treatment. In this process, the larger boroxine cages 12‐mer and 15‐mer were found to be entropically favored owing to the release of free pyridine molecules from 9‐mer ?6 Py. |
| Keywords: | boroxines covalent organic cages dynamic interconversion supramolecular chemistry |