A molecular switch based on acid and base promoted, cation governed binding in a crown ether threaded rotaxane |
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| Authors: | Yuji Tokunaga Tatsuya Nakamura Megumi Yoshioka Youji Shimomura |
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| Institution: | Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, Fukui 910-8507, Japan |
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| Abstract: | A rotaxane, containing both oligo ethylene glycol and secondary ammonium cation binding sites for a threaded crown ether, has been prepared. 1H NMR spectroscopy has been used to show that the crown ether moiety in the rotaxane undergoes acid-base and alkali metal cation dependent switch from binding at the ammonium cation position to cooperative binding to the metal cation at the oligo ethylene glycol site. |
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| Keywords: | Rotaxane Molecular switch pH-responsive Hydrogen bonding Alkali metal ion |
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