Fluorescence Visualization of Strain by Tetraphenylethylene/Ruthenium Complex Three-Dimensional Covalent Organic...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Dynamic visualization of strain distribution in materials presents significant challenges.
• Developing advanced materials for sensitive and reversible optical measurements is crucial.

Purpose of the Study:

• To synthesize novel dual-fluorophore three-dimensional covalent organic frameworks (3D-COFs) and their PEGylated counterparts (PEG-3D-COFs).
• To establish physically interacted assemblies for fluorescence imaging of strain, surface friction, and flow velocity distributions.
• To investigate the responsive properties of these COFs in diverse media.

Main Methods:

• Synthesis of dual-fluorophore 3D-COFs and PEG-3D-COFs.
• Construction of physically interacted assemblies.
• Fluorescence imaging techniques to monitor strain, friction, and flow.
• Characterization of concentration-dependent morphology and photoluminescence.
• Analysis of concentration-deformation equivalence and structural evolution dynamics.

Main Results:

• Demonstrated successful synthesis of dual-fluorophore 3D-COFs and PEG-3D-COFs.
• Achieved fluorescence imaging of strain distribution in polymer elastomers, organic, and aqueous dispersions.
• Observed sensitive and reversible color changes in COF emission correlated with applied strain.
• Established concentration-dependent morphology and photoluminescence linked to structural evolution.

Conclusions:

• The developed 3D-COFs and PEG-3D-COFs are effective for dynamic optical measurement of strain and related phenomena.
• The responsiveness is attributed to controllable aggregation structures and concentration-deformation equivalence.
• These findings offer a promising platform for constructing responsive COFs for advanced optical measurement applications.