Highly reactive bis-cyclooctyne-modified diarylethene for SPAAC-mediated cross-linking

Area of Science:

• Organic Chemistry
• Materials Science
• Photochemistry

Background:

• Photoisomerizable diarylethenes are key components for developing photocontrollable molecular systems.
• Bistable systems offer potential for advanced molecular switches and data storage.

Purpose of the Study:

• To design and synthesize a novel cross-linking reagent utilizing a photoisomerizable diarylethene core.
• To investigate the reactivity of strained cyclooctyne moieties incorporated into the diarylethene structure.
• To explore the application of this reagent in catalyst-free cycloaddition reactions.

Main Methods:

• Synthesis of diarylethene-based cross-linking reagent with two strained cyclooctynes.
• Evaluation of reactivity in 1,3-dipolar cycloaddition reactions.
• Computational analysis using quantum chemical calculations to understand reactivity origins.

Main Results:

• Successful design and synthesis of the diarylethene-based cross-linking reagent.
• Demonstrated high reactivity of the strained cyclooctyne rings in catalyst-free cycloaddition reactions.
• Quantum chemical calculations confirmed that fused thiophene rings enhance cyclooctyne strain and reactivity.

Conclusions:

• The developed diarylethene-based cross-linking reagent is effective for photocontrollable applications.
• The enhanced reactivity is attributed to the strain introduced by fused thiophene rings.
• This work provides insights into the design of novel functional molecular materials.