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This study visualizes and manipulates solid-state molecular motions in multicomponent cocrystals, enabling new applications in information storage and dynamic anticounterfeiting.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Chemical Crystallography

Background:

  • Solid-state molecular motions (SSMM) are crucial for material properties but are understudied in multicomponent systems.
  • Challenges exist in researching and controlling SSMM, particularly in complex material assemblies.

Purpose of the Study:

  • To visualize and manipulate SSMM in two-component cocrystal systems.
  • To explore the aggregation-induced emission (AIE) properties of novel cocrystals.
  • To apply SSMM-induced emission changes for practical applications.

Main Methods:

  • Cocrystal engineering of FSBO/TCB and PVBO/TCB systems.
  • Fluorescence spectroscopy to monitor SSMM under varying pressure and temperature.
  • Investigation of molecular mobility in 1D confined environments.

Main Results:

  • FSBO/TCB (F/T) cocrystal shows turn-on fluorescence; PVBO/TCB (P/T) cocrystal exhibits red-shifted emission, both with AIE properties.
  • Grinding mixtures demonstrate distinct SSMM observable via fluorescence changes.
  • Significant molecular movement (4 mm) observed in FSBO/TCB within a 1D tube without grinding.

Conclusions:

  • SSMM in multicomponent cocrystals can be visualized and manipulated using fluorescence.
  • The unique emission responses to SSMM offer potential for information storage and dynamic anticounterfeiting.
  • This research provides valuable insights into multicomponent aggregate science and SSMM.