Self-Assembled Bis-Acridinium Tweezer Equilibria Controlled by Multi-Responsive Properties.

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Physical Chemistry

Background:

• Bis-acridinium compounds are explored for their self-assembly properties.
• Controlling molecular interactions is crucial in supramolecular chemistry.

Purpose of the Study:

• To synthesize novel protonated and methylated bis-acridinium tweezers.
• To investigate the self-assembly behavior and thermodynamic parameters of these tweezers.
• To explore the pH and redox responsiveness for modulating monomer-dimer equilibria.

Main Methods:

• Synthesis of bis-acridinium tweezers with specific pyridyl spacers.
• Thermodynamic analysis of homodimer formation in organic solvents.
• Biphasic transfer experiments to study equilibrium shifts.
• Electrochemical investigations of reduced methylated homodimers.

Main Results:

• Successful synthesis of protonated and methylated bis-acridinium tweezers.
• Demonstration of self-assembly into corresponding homodimers.
• Quantification of thermodynamic parameters governing dimer formation.
• Observation of dimer dissociation upon reduction.
• Confirmation of pH and redox control over monomer-dimer equilibria.

Conclusions:

• Bis-acridinium tweezers exhibit tunable self-assembly.
• External stimuli like pH and redox potential offer precise control over molecular equilibria.
• These findings advance the design of responsive supramolecular systems.