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Azobenzene boronic acids offer light-controlled diol binding. Isomerization to the Z-form significantly enhances binding, enabling applications in adaptable materials and molecular switches.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Azobenzene derivatives are known photoswitches.
  • Boronic acids are widely used in dynamic covalent chemistry.
  • Controlling molecular interactions with light is a key challenge.

Purpose of the Study:

  • To develop azobenzene boronic acids for photoswitchable diol binding.
  • To investigate the influence of azobenzene structure on binding affinity.
  • To demonstrate applications in molecular recognition and materials science.

Main Methods:

  • Synthesis of azobenzene boronic acid derivatives.
  • Photochemical isomerization studies (E/Z isomers).
  • Diol binding affinity measurements (competition experiments).
  • Computational modeling (DFT).
  • Fabrication and characterization of hydrogels.

Main Results:

  • Azobenzene boronic acids exhibit reversible, light-controlled diol binding.
  • E to Z isomerization dramatically enhances diol binding affinity (up to 20-fold).
  • Structural modifications tune binding thermodynamics and photostationary states.
  • Demonstrated photoswitchable capture/release of a fluorophore-tagged diol.
  • Developed light-tunable covalent adaptable hydrogels.

Conclusions:

  • Azobenzene boronic acids provide a versatile platform for light-responsive dynamic covalent chemistry.
  • Structural tuning of azobenzene enables precise control over diol binding.
  • These systems have potential in smart materials, drug delivery, and sensing.