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Separation of Linear and Branched Alkanes Using Host–Guest Complexation of Cyclic and Branched Alkane Vapors by Crystal State Pillar[6]arene |
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| Authors: | Prof Tomoki Ogoshi Kazuki Saito Ryuta Sueto Ryosuke Kojima Yukie Hamada Prof Shigehisa Akine Dr Adhitya Mangala Putra Moeljadi Dr Hajime Hirao Dr Takahiro Kakuta Prof Tada‐aki Yamagishi |
| Affiliation: | 1. Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Japan;2. JST, PRESTO, Kawaguchi, Saitama, Japan;3. WPI Nano Life Science Institute, Kanazawa University, Kakuma-machi, Kanazawa, Japan;4. Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China;5. Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore |
| Abstract: | Activated crystals of pillar6]arene produced by removing the solvent upon heating were able to take up branched and cyclic alkane vapors as a consequence of their gate‐opening behavior. The uptake of branched and cyclic alkane vapors by the activated crystals of pillar6]arene induced a crystal transformation to form one‐dimensional channel structures. However, the activated crystals of pillar6]arene hardly took up linear alkane vapors because the cavity size of pillar6]arene is too large to form stable complexes with linear alkanes. This shape‐selective uptake behavior of pillar6]arene was further utilized for improving the research octane number of an alkane mixture of isooctane and n‐heptane: interestingly, the research octane number was dramatically improved from a low research octane number (17 %) to a high research octane number (>99 %) using the activated crystals of pillar6]arene. |
| Keywords: | alkanes host– guest chemistry macrocyclic compounds pillar[n]arenes separation |
