Dynamic self-assembly of ions with variable size and charge in solution.

Area of Science:

• Supramolecular Chemistry
• Materials Science

Background:

• Ionic self-assembly can form colloid-like structures called ionoids.
• Previous studies focused on specific tetraimidazolium cations and dianionic salts.

Purpose of the Study:

• To demonstrate the generalizability of ionoid formation.
• To explore how variations in ionic building blocks influence self-assembled structures.
• To establish generalized conditions for ionoid formation.

Main Methods:

• Dynamic Light Scattering (DLS)
• Continuously Monitored Phase-Analysis Light Scattering (cmPALS)
• Continuous Wave Electron Paramagnetic Resonance (CW EPR) spectroscopy
• Ionoid Evolution Diagrams (IEDs)

Main Results:

• New cationic and anionic molecules successfully formed ionoids.
• The size ratio of ionic components significantly impacts ionoid size, shape, and durability.
• Generalized ionic ratios were defined for ionoid formation based on size and charge density.
• Self-assembled structures demonstrated long lifetimes, persisting for months.

Conclusions:

• Ionoid formation is a general phenomenon applicable to various ionic building blocks.
• The study provides a framework for designing and controlling ionoid structures.
• This work expands the potential applications of dynamic, soft ionic materials in supramolecular chemistry.