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A room temperature phosphorescence encoding [2]rotaxane molecular shuttle.

Xiang Ma1, Jing Zhang1, Jingjing Cao1

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals , East China University of Science & Technology , Shanghai 200237 , P. R. China .

Chemical Science
|August 30, 2018
PubMed
Summary

This study introduces a novel molecular shuttle capable of switching positions using acid-base triggers. Its movement is monitored by changes in light emission, marking a first for rotaxane-based molecular shuttles.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Molecular shuttles are crucial for developing molecular machines.
  • Controlling shuttling motion and signal output is key for advanced applications.
  • Platinum(II) porphyrins offer unique photophysical properties for sensing.

Purpose of the Study:

  • To synthesize a novel bistable molecular shuttle.
  • To demonstrate acid-base switchable shuttling motion.
  • To encode shuttling information using room temperature phosphorescence (RTP) signals.

Main Methods:

  • Synthesis of a rotaxane using click chemistry.
  • Utilizing a Pt(ii) porphyrin, dibenzo[24]crown-8 macrocycle, and anthracene stopper.
  • Characterization of molecular motion via photophysical measurements (RTP and fluorescence).

Main Results:

  • A novel Pt(ii) porphyrin-based molecular shuttle was successfully synthesized.
  • Acid-base conditions controllably switched the macrocycle between recognition sites (NH2+ and Bpym2+).
  • Shuttling motion was effectively monitored by changes in RTP intensity and lifetime of the Pt(ii) porphyrin.

Conclusions:

  • This work presents the first rotaxane-type molecular shuttle with shuttling encoded by RTP signals.
  • The distance-dependent energy transfer mechanism allows for optical readout of molecular position.
  • This system offers a new platform for developing responsive molecular machines and sensors.