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Light-Driven Aqueous Dissipative Pseudorotaxanes with Tunable Fluorescence Enabling Deformable Nano-Assemblies.

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Summary

Researchers developed light-activated convertible pseudorotaxanes (PRs) that self-assemble into dynamic nanoscale machines. These molecular machines exhibit tunable fluorescence and form nanoparticles for imaging, offering a new frontier in supramolecular chemistry.

Keywords:
cucurbiturildissipative self-assemblymolecular machineorganelle imagingpseudorotaxane

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Area of Science:

  • Supramolecular Chemistry
  • Nanotechnology
  • Materials Science

Background:

  • Developing artificial molecular machines that self-assemble far from equilibrium is a significant challenge.
  • Dissipative self-assembly offers a pathway to create dynamic nanoscale structures.

Purpose of the Study:

  • To report light-activated convertible pseudorotaxanes (PRs) that undergo dissipative self-assembly.
  • To demonstrate tunable fluorescence and the formation of deformable nano-assemblies.

Main Methods:

  • Utilized a pyridinium-conjugated sulfonato-merocyanine derivative (EPMEH) and cucurbit[8]uril (CB[8]).
  • Investigated light-induced phototransformation between [3]PR and [2]PR states.
  • Observed thermal relaxation and fluorescence changes.

Main Results:

  • Formed 2EPMEH ⊂ CB[8] [3]PR and light-induced transient 1:1 EPSP ⊂ CB[8] [2]PR.
  • Demonstrated reversible thermal relaxation with periodic fluorescence changes, including near-infrared emission.
  • Created octahedral and spherical nanoparticles via dissipative self-assembly.
  • Successfully imaged the Golgi apparatus using fluorescent dissipative nano-assemblies.

Conclusions:

  • Dissipative self-assembly of light-activated convertible PRs enables the creation of dynamic nanoscale molecular machines.
  • Tunable fluorescence and nanoparticle formation offer potential for advanced imaging applications, such as dynamic Golgi apparatus imaging.