Multi-Stimuli Responsive Cyanostilbene Assemblies in Aqueous Media: Temporal Luminescence Modulation Through...

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Photochemistry

Background:

• Cationic cyanostilbene (CS) derivatives exhibit self-assembly in aqueous media.
• The peripheral pyridine and pyridinium moieties influence aggregate formation and properties.
• Luminescence modulation is key for advanced material functionalities.

Purpose of the Study:

• To investigate the self-assembly behavior of novel cationic cyanostilbene derivatives.
• To explore the tunable luminescence of these assemblies in response to external stimuli.
• To demonstrate potential applications in responsive materials and information encryption.

Main Methods:

• Synthesis of N-alkyl pyridinium and pyridine-functionalized cyanostilbene derivatives.
• Characterization of self-assembled structures in water using spectroscopic techniques.
• Investigation of luminescence modulation by metal ions (Ag(I)), pH variations, and photoreactions.

Main Results:

• Self-assembly in water is dependent on the alkyl chain length.
• Luminescence is effectively modulated by Ag(I) ions, leading to red-shifts and enhanced quantum efficiency.
• Controlled photoreactions and pH changes enable multiple emission colors and transitory luminescence signals.

Conclusions:

• Cationic cyanostilbene derivatives form tunable luminescent self-assemblies.
• The system demonstrates responsiveness to metal ions and pH, with potential for photoregulation.
• Applications in time-encoded information encryption and responsive materials are feasible.