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An electric field induced reversible single-molecule fluorescence switch.

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  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. xlt@sxu.edu.cn.

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Summary

Applying an electric field to a single squaraine-derived rotaxane molecule switches its fluorescence reversibly between on and off states. This controllable fluorescence is due to intramolecular electron transfer, enabling new optical switching applications.

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Area of Science:

  • Molecular Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Fluorescence quenching is a key phenomenon in molecular switches.
  • Rotaxanes offer unique structural properties for molecular manipulation.
  • Controlling molecular fluorescence with external stimuli is crucial for advanced materials.

Purpose of the Study:

  • To investigate the effect of electric fields on the fluorescence of single squaraine-derived rotaxane molecules.
  • To demonstrate reversible fluorescence switching in a single molecule.
  • To elucidate the mechanism behind the observed fluorescence modulation.

Main Methods:

  • Single-molecule fluorescence spectroscopy.
  • Application of external electric fields to a single molecule immobilized on a glass substrate.
  • Analysis of fluorescence intensity changes in response to varying electric field strengths.

Main Results:

  • Complete fluorescence quenching of a single squaraine-derived rotaxane (SR) molecule was achieved by applying an electric field.
  • A reversible fluorescence switch between a zero-field "on" state and a high-field "off" state was demonstrated.
  • The observed switching behavior was attributed to electric-field-induced intramolecular electron transfer within the SR molecule.

Conclusions:

  • Single squaraine-derived rotaxanes can function as electrically controlled molecular switches.
  • Intramolecular electron transfer is a viable mechanism for modulating fluorescence in rotaxane systems.
  • This work opens possibilities for developing single-molecule optical devices and sensors.