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Fluorescence modulation in tribranched switchable [4]rotaxanes.

Ji-Na Zhang1, Hong Li, Wei Zhou

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-64252288.

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Summary

Two novel tribranched [4]rotaxanes were synthesized, featuring unique binding sites and fluorescent stoppers. Acid-base stimuli control macrocycle shuttling and distinct fluorescence changes, showing potential for complex molecular assemblies.

Keywords:
bistable rotaxanesclick chemistryfluorescencefunctionphotoinduced electron transfer

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Engineering
  • Materials Science

Background:

  • Rotaxanes are mechanically interlocked molecules with potential applications in molecular machines.
  • Designing complex, multi-component supramolecular systems requires precise control over molecular interactions.

Purpose of the Study:

  • To synthesize and characterize novel tribranched [4]rotaxanes with tunable fluorescence properties.
  • To investigate the acid-base responsive shuttling behavior and fluorescence modulation of these rotaxanes.

Main Methods:

  • Synthesis of tribranched [4]rotaxanes using a 1,3,5-triphenylene core.
  • Characterization via NMR spectroscopy and HR-ESI mass spectrometry.
  • Investigation of acid-base stimuli-induced shuttling and fluorescence changes using NMR and time-resolved fluorescence measurements.

Main Results:

  • Successful synthesis of two [4]rotaxanes (1 and 2) with distinct crown ether functionalities.
  • Demonstrated acid-base controllable shuttling of macrocycles along the rotaxane arms.
  • Observed distinct fluorescence modulation in response to base addition, with rotaxane 1 showing a decrease and rotaxane 2 showing an enhancement.

Conclusions:

  • The synthesized tribranched [4]rotaxanes exhibit controllable molecular shuttling and distinct fluorescence responses.
  • The findings highlight the potential of these structures for developing sophisticated molecular assemblies and functional materials.
  • Understanding photoinduced electron-transfer processes is key to optimizing fluorescence modulation in such systems.