Separation of Linear and Branched Alkanes Using Host–Guest Complexation of Cyclic and Branched Alkane Vapors by Crystal State Pillar[6]arene. Issue 6 (15th January 2018)

• Record Type: Journal Article
• Authors: Ogoshi, Tomoki; Saito, Kazuki; Sueto, Ryuta; Kojima, Ryosuke; Hamada, Yukie; Akine, Shigehisa; Moeljadi, Adhitya Mangala Putra; Hirao, Hajime; Kakuta, Takahiro; Yamagishi, Tada‐aki
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 6(2018)
• Page Start: 1592
• Page End: 1595
• Publication Date: 2018-01-15
• Subjects: alkanes -- host–guest chemistry -- macrocyclic compounds -- pillar[n]arenes -- separation; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201711575
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Activated crystals of pillar[6]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 pillar[6]arene induced a crystal transformation to form one‐dimensional channel structures. However, the activated crystals of pillar[6]arene hardly took up linear alkane vapors because the cavity size of pillar[6]arene is too large to form stable complexes with linear alkanes. This shape‐selective uptake behavior of pillar[6]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 pillar[6]arene. Abstract : Activated crystals of pillar[6]arene took up branched and cyclic alkane vapors, but hardly took up linear alkane vapors. Based on the selective branched alkane vapor uptake, the research octane number of an alkane mixture of isooctane and n ‐heptane could be improved: the research octane number improved from 17 % to more than 99 % using the activated crystals of pillar[6]arene.