A molecular switch based on acid and base promoted, cation governed binding in a crown ether threaded rotaxane

作者：Tokunaga Yuji^*; Nakamura Tatsuya; Yoshioka Megumi; Shimomura Youji

来源：Tetrahedron Letters, 2006, 47(33): 5901-5904.

DOI：10.1016/j.tetlet.2006.06.062

• rotaxane
• molecular switch
• pH-responsive
• hydrogen bonding
• alkali metal ion

A rotaxane, containing both oligo ethylene glycol and secondary ammonium cation binding sites for a threaded crown ether, has been prepared. (1)H 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.

• 出版日期2006-8-14