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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
Author(s) -
Ogoshi Tomoki,
Saito Kazuki,
Sueto Ryuta,
Kojima Ryosuke,
Hamada Yukie,
Akine Shigehisa,
Moeljadi Adhitya Mangala Putra,
Hirao Hajime,
Kakuta Takahiro,
Yamagishi Tadaaki
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201711575
Subject(s) - alkane , pillar , octane , heptane , solvent , crystal (programming language) , chemistry , materials science , decane , organic chemistry , crystallography , hydrocarbon , structural engineering , computer science , engineering , programming language
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.