1. A Hexahomotrioxacalix[3]arene-Based Ditopic Receptor for Alkylammonium Ions Controlled by Ag+ Ions.
- Author
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Jiang, Xue-Kai, Ikejiri, Yusuke, Wu, Chong, Rahman, Shofiur, Georghiou, Paris E., Zeng, Xi, Elsegood, Mark R. J., Redshaw, Carl, Teat, Simon J., and Yamato, Takehiko
- Subjects
PYRIDYL compounds ,METAL ions ,AMMONIUM ions ,ALLOSTERIC regulation ,AROMATIC compounds - Abstract
A receptor cone-1 based on a hexahomotrioxacalix[3]arene bearing three pyridyl groups was successfully synthesized, which has a C
3 -symmetric conformation and is capable of binding alkylammonium and metal ions simultaneously in a cooperative fashion. It can bind alkylammonium ions through the -cavity formed by three aryl rings. This behaviour is consistent with the cone-in/cone-out conformational rearrangement needed to reorganize the cavity for endo-complexation. As a C3 -symmetrical pyridyl-substituted calixarene, receptor cone-1 can also bind an Ag+ ion, and the nitrogen atoms are turned towards the inside of the cavity and interact with Ag+ . After complexation of tris(2-pyridylamide) derivative receptor cone-1 with Ag+ , the original C3 -symmetry was retained and higher complexation selectivity for n-BuNH3 + versus t-BuNH3 + was+ and n-BuNH3 + ions. [ABSTRACT FROM AUTHOR]- Published
- 2018
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