Luminescent Supramolecular Ionic Frameworks based on Organic Fluorescent Polycations and Polyanionic Phosphorescent...

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Photochemistry

Background:

• Ionic supramolecular frameworks offer tunable properties for advanced applications.
• Tetraphenylethylene derivatives are known for their aggregation-induced emission characteristics.
• Octahedral metal clusters provide unique structural and electronic features.

Purpose of the Study:

• To design and synthesize novel emissive ionic supramolecular frameworks.
• To investigate the structural and photophysical properties of these hybrid materials.
• To explore the influence of oxygen on the luminescence of molybdenum-based frameworks.

Main Methods:

• Supramolecular self-assembly of tetraphenylethylene-based tetra-cationic units and anionic metal clusters (molybdenum or rhenium).
• Single-crystal X-ray diffraction for structural characterization.
• Photoluminescence spectroscopy (one-photon and two-photon absorption) to study emission properties in solid-state and solution.

Main Results:

• Successful synthesis and structural elucidation of emissive ionic supramolecular frameworks.
• Demonstration of luminescence in both dry powder and solution states.
• Observation of oxygen concentration-dependent luminescence color tuning in the molybdenum-based hybrid material.

Conclusions:

• Ionic supramolecular frameworks incorporating metal clusters can exhibit tunable photoluminescence.
• The emission properties are sensitive to the surrounding environment, including oxygen levels.
• These findings open avenues for developing novel oxygen sensors and emissive materials.