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Front Cover: Complexation Between ( O ‐Methyl) 6 ‐2,6‐Helic[6]arene and Tertiary Ammonium Salts: Acid/Base‐ or Chloride‐Ion‐Responsive Host–Guest Systems and Synthesis of [2]Rotaxane (Chem. Asian J. 19/2017)
Author(s) -
Shi Qiang,
Han Ying,
Chen ChuanFeng
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701063
Subject(s) - protonation , chemistry , ammonium , ionic bonding , ion , base (topology) , chloride , polymer chemistry , stereochemistry , organic chemistry , mathematical analysis , mathematics
The Front Cover shows a helic[ n ]arene cartoon character trying to pull a protonated ammonium species toward it, while other ionic species attempt to pull it away from the helic[ n ]arene. In their Full Paper, Chuang‐Feng Chen et al. describe an artificial molecular host ( O ‐methyl) 6 ‐2,6‐helic[6]arene, showing excellent complexing ability to the protonated tertiary ammonium salts that were rarely used as guests before in host–guest chemistry. Interestingly, the formation and deformation of this kind of complex could be controlled by acid–base and chloride ions reversibly. Meanwhile, a helicarene‐based [2]rotaxane was synthesized in a moderate yield. This mechanical structure could provide more opportunities to construct molecular machines and new smart materials. More information can be found in the Full Paper by Chuang‐Feng Chen et al. on page 2576 in Issue 19, 2017 (DOI: 10.1002/asia.201700857).