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Solvent-induced structural transformation in luminescence-enhanced polymorphic ionic HOFs.

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Solvent regulation switches structure and luminescence in ionic hydrogen-bonded organic frameworks (iHOFs). This leads to a 100x emission intensity difference between iHOF-65 and iHOF-64, offering insights into crystalline material design.

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Area of Science:

  • Materials Science
  • Crystallography
  • Photochemistry

Background:

  • Ionic hydrogen-bonded organic frameworks (iHOFs) are crystalline materials with tunable properties.
  • Understanding structure-property relationships in iHOFs is crucial for developing advanced functional materials.

Purpose of the Study:

  • To investigate the effect of solvent regulation on the structure and luminescence of polymorphic iHOFs.
  • To elucidate the mechanism behind luminescence switching and conjugation changes induced by solvent molecules.

Main Methods:

  • Synthesis and characterization of two distinct iHOF polymorphs.
  • Solvent vapor diffusion experiments to induce structural transitions.
  • Photoluminescence spectroscopy to quantify emission properties.

Main Results:

  • Solvent regulation successfully induced structural switching between two iHOF polymorphs.
  • A significant difference in emission intensity (approx. 100-fold) was observed between the two solvate-regulated forms.
  • Conjugation changes were correlated with the observed luminescence switching.

Conclusions:

  • Solvent molecules play a critical role in controlling the structure and luminescence of iHOFs.
  • The study provides a valuable reference for designing solvate-regulated crystalline materials with dynamic structural and luminescent properties.