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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Organic photoluminescent materials are widely used, but phosphorescent hosts capable of binding organic guests are rare.
  • Acyclic cucurbiturils are known for their host-guest chemistry but typically lack phosphorescent properties.

Purpose of the Study:

  • To develop a purely organic room-temperature phosphorescent (RTP) host material.
  • To investigate the guest encapsulation and energy transfer capabilities of the novel host.
  • To explore applications in multicolor afterglow materials and sensing.

Main Methods:

  • Synthesis of acyclic cucurbituril modified with four carboxylic acids (ACB-COOH).
  • Characterization of RTP properties of ACB-COOH, including emission wavelength and lifetime.
  • Assembly of ACB-COOH with a polyvinyl alcohol (PVA) matrix to enhance RTP.
  • Encapsulation of organic guests (fluorescence dyes, drug molecule) within the ACB-COOH host.
  • Demonstration of multicolor afterglow and sensing applications.

Main Results:

  • ACB-COOH exhibits intrinsic purely organic RTP at 510 nm with a lifetime of 1.86 μs.
  • Assembly with PVA significantly enhanced RTP properties (lifetime up to 2.12 s, quantum yield of 6.29%).
  • ACB-COOH successfully encapsulated organic guests, facilitating energy transfer.
  • Developed multicolor afterglow materials and demonstrated visible sensing of morphine.
  • Showcased the tunability of afterglow color by modifying aromatic sidewalls.

Conclusions:

  • A novel phosphorescent acyclic cucurbituril host (ACB-COOH) was successfully synthesized and characterized.
  • The material demonstrates significant potential for advanced applications in long-lived luminescent materials, including multicolor afterglow and chemical sensing.
  • This work opens new avenues for designing intelligent supramolecular phosphorescent systems.