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Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
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A luminescent molecular turnstile.

Nicolas Zigon1, Patrick Larpent, Abdelaziz Jouaiti

  • 1Molecular Tectonic Laboratory, UMR UDS-CNRS 7140, icFRC, University of Strasbourg, Institut Le Bel, 4, rue Blaise Pascal, F-67000 Strasbourg, France. hosseini@unistra.fr.

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|September 13, 2014
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Summary

Researchers developed a novel molecular turnstile with a luminescent rotor. Adding palladium(II) ions locked the rotor, quenching luminescence via the heavy atom effect, demonstrating controlled molecular motion.

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Machines
  • Photochemistry

Background:

  • Development of molecular machines capable of controlled motion is a key area in supramolecular chemistry.
  • Molecular turnstiles offer potential for applications in sensing and molecular logic gates.
  • Luminescent properties can be modulated by external stimuli, enabling responsive molecular systems.

Purpose of the Study:

  • To synthesize and characterize a novel molecular turnstile with a luminescent hydroquinone hinge.
  • To investigate the dynamic behavior and rotational motion of the molecular turnstile in solution.
  • To demonstrate the control of molecular motion and luminescence via metal complexation.

Main Methods:

  • Single-crystal X-ray diffraction for solid-state structure determination.
  • 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy to study dynamic behavior in solution.
  • Spectroscopic analysis to monitor luminescence changes upon addition of metal ions.

Main Results:

  • Successful synthesis and structural characterization of the molecular turnstile.
  • Confirmation of free rotation of the rotor around the stator in solution via NMR.
  • Demonstration of rotational locking upon Pd(II) complexation, simultaneously involving the stator and rotor.
  • Observation of luminescence quenching in the closed state due to the heavy atom effect of Pd(II).

Conclusions:

  • The synthesized molecular turnstile exhibits controllable rotational motion.
  • Pd(II) complexation effectively locks the rotor and modulates luminescence, showcasing a responsive molecular system.
  • This work provides a foundation for designing advanced molecular machines with tunable photophysical properties.