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Temperature-Responsive Supramolecular Chiral Switch Achieved by Macrocyclic Confinement.

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  • 1College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China.

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Summary
This summary is machine-generated.

Hydroxypropyl-β/γ-cyclodextrin (HPβ/γCD) and cucurbit[8]-uril (CB[8]) create tunable nanoaggregates with phenylalanine dipeptide-modified pyrene (PFF). These supramolecular systems exhibit chiral transmission and temperature-controlled switching for applications in logic gates and encryption.

Keywords:
chiral transmissionmacrocyclic confinementsupramolecular chiral temperature switchesthermal responsivenesstunable morphologies

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chiroptical Materials

Background:

  • Host-guest complexation is crucial for designing functional supramolecular materials.
  • Chiral recognition and transmission are key challenges in developing advanced molecular systems.
  • Controlling the morphology and properties of nanoaggregates is essential for novel applications.

Purpose of the Study:

  • To construct tunable supramolecular nanoaggregates using cyclodextrins and cucurbiturils.
  • To investigate the chiral transmission from phenylalanine dipeptide to pyrene moiety.
  • To develop temperature-controlled supramolecular chiral switches for advanced applications.

Main Methods:

  • Host-guest complexation of phenylalanine dipeptide-modified pyrene (PFF) with hydroxypropyl-β/γ-cyclodextrin (HPβ/γCD) and cucurbit[8]-uril (CB[8]).
  • Morphological characterization of nanoaggregates, including nanofibers, nanoparticles, nanotubes, and nanosheets.
  • Spectroscopic analysis (fluorescence and circular dichroism) to confirm chiral transmission and quantify properties.
  • Molecular dynamics and density functional theory calculations to elucidate complexation mechanisms.
  • Evaluation of thermal responsiveness and application in chiral logic gates and encryption.

Main Results:

  • HPβ/γCD and CB[8] formed tunable nanoaggregates with PFF, exhibiting topological transformations.
  • Efficient chiral transmission from phenylalanine dipeptide to pyrene was achieved, leading to distinct circular dichroism signals.
  • HPγCD showed enhanced fluorescence and CD properties compared to HPβCD due to double PFF encapsulation.
  • CB[8] demonstrated stronger binding affinity and a significant positive CD peak.
  • Supramolecular chiral switches displayed reversible thermal responsiveness (20-75 °C) and were successfully applied in chiral logic gates and polarization-dependent encryption.

Conclusions:

  • HPγCD and CB[8] are effective hosts for constructing PFF-based supramolecular chiral switches.
  • The developed systems exhibit tunable morphology, efficient chiroptical transmission, and thermal responsiveness.
  • These supramolecular chiral switches hold promise for applications in advanced optical devices and information security.