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Chemically fueled dynamic switching between assembly-encoded emissions.

Manirul Islam1, Malay Kumar Baroi2, Basab Kanti Das2

  • 1Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) Kolkata, Kolkata 700054, India. sahnawaz@niperkolkata.ac.in.

Materials Horizons
|April 30, 2024
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Summary
This summary is machine-generated.

Researchers developed a novel chemical fuel strategy to dynamically switch between two emissive states of peptide-based supramolecular materials. This method enables smart material design with tunable properties and spatiotemporal control.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Biology

Background:

  • Self-assembly enables the creation of advanced supramolecular materials from single building blocks.
  • Dynamic control over functional states in these materials is crucial for developing smart materials but remains a significant challenge.

Purpose of the Study:

  • To demonstrate a chemical fuel-mediated strategy for dynamically switching between two distinct emissive states of supramolecular aggregates.
  • To explore the potential of this system for applications like self-erasable writing.

Main Methods:

  • Utilized a naphthalimide-appended peptide building block capable of self-assembly.
  • Employed ethyl-3-(3-(dimethylamino)propyl)carbodiimide (EDC) as a chemical fuel to induce a transformation between aggregated states.
  • Investigated the emission properties and kinetic stability of the aggregates.
  • Incorporated the system into an agarose gel matrix for spatiotemporal control.

Main Results:

  • A molecularly dissolved building block exhibited weak blue emission.
  • The first assembled state (Agg-1) showed cyan emission due to π-stacking excimer formation.
  • Addition of EDC triggered the formation of a second aggregated state (Agg-2) with strong blue emission via anhydride formation.
  • Hydrolysis of the anhydride gradually restored Agg-1 and the cyan emission, demonstrating a reversible system.
  • The stability of Agg-2 was tunable by EDC concentration.
  • Spatiotemporal control was achieved within an agarose gel, enabling a self-erasable writing system.

Conclusions:

  • A novel chemical fuel-mediated strategy allows dynamic switching between two emissive supramolecular states.
  • This system offers tunable properties and spatiotemporal control, paving the way for advanced smart materials.
  • The developed system functions as a self-erasable writing medium, highlighting its practical potential.