Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 26, Pages 8835-8847Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201601286
Keywords
crown compounds; kinetics; molecular machines; rotaxanes; thermodynamics
Categories
Funding
- Research and National Education French Ministry
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The efficient synthesis and very easy isolation of dibenzo[24] crown-8-based [2]pseudorotaxane building blocks that contain an active ester motif at the extremity of the encircled molecular axle and an ammonium moiety as a template for the dibenzo[24]crown-8 is reported. The active ester acts both as a semistopper for the [2] pseudorotaxane species and as an extensible extremity. Among the various investigated active ester moieties, those that allow for the slippage process are given particular focus because this strategy produces fewer side products. Extension of the selected N-hydroxysuccinimide ester based pseudorotaxane building block by using either a mono-or a diamino compound, both containing a triazolium moiety, is also described. These provide a pH-dependent two-station [2]rotaxane molecular machine and a palindromic [3] rotaxane molecular machine, respectively. Molecular machinery on both interlocked compounds through variation of pH was studied and characterized by means of NMR spectroscopy.
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