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Published on: October 30, 2014
Acid-base responsive molecular switching of a [2]rotaxane incorporating two different stations in an axle component
Risa Yamane1, Yuki Asai1, Nanami Takiguchi1
1Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology Asahi-ku Osaka 535-8585 Japan masahiro.muraoka@oit.ac.jp.
Abstract:
Interlocked compounds such as rotaxanes and catenanes exhibit unique kinetic properties in response to external chemical or physical stimuli and are therefore expected to be applied to molecular machines and molecular sensors. To develop a novel rotaxane for this application, an isophthalamide macrocycle and a neutral phenanthroline axle were used. Stable pseudorotaxanes are known to be formed using hydrogen bonds and π-π interactions. In this study, we designed a non-symmetric axial molecule and synthesized a [2]rotaxane with the aim of introducing two different stations; a phenanthroline and a secondary amine/ammonium unit. Furthermore, 1H NMR measurements demonstrated that the obtained rotaxane acts as a molecular switch upon application of external acid/base stimuli.
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