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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Biomaterials Science

Background:

  • Cyclopropenone-masked dibenzocyclooctynes are precursors for click chemistry.
  • Femtosecond laser irradiation can induce photochemical reactions.
  • Strain-promoted azide-alkyne cycloaddition (SPAAC) is a bioorthogonal click reaction.

Purpose of the Study:

  • To develop a novel photoclick chemistry method using multiphoton excitation.
  • To enable high-resolution 3D derivatization of materials and biological tissues.

Main Methods:

  • Irradiation of cyclopropenone-masked dibenzocyclooctynes with femtosecond near-infrared laser pulses.
  • Utilizing nonresonant two- or three-photon excitation to trigger photodecarbonylation.
  • Performing strain-promoted azide-alkyne cycloaddition (SPAAC) with organic azides.

Main Results:

  • Photodecarbonylation of masked dibenzocyclooctynes was successfully achieved via multiphoton excitation.
  • Multiphoton-generated cyclooctynes efficiently reacted with organic azides to form triazoles.
  • High-resolution 3D photoclick derivatization of hydrogels and tissues was demonstrated using this MP-SPAAC method.

Conclusions:

  • Multiphoton-triggered SPAAC (MP-SPAAC) is a viable method for precise photoclick derivatization.
  • This technique offers high resolution for 3D modification of hydrogels and tissues.
  • MP-SPAAC expands the toolkit for advanced material and biological engineering.