Self-Assembly in Water with N-Substituted Imines

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Imine bonds are reversible in organic solvents but labile in water, limiting their use in aqueous self-assembly.
• Traditional imine chemistry struggles with stability in biological and aqueous environments.

Purpose of the Study:

• To review water-compatible dynamic covalent bonds, specifically N-substituted imine derivatives like hydrazones and oximes.
• To explain the enhanced stability of hydrazones and oximes in aqueous media compared to parent imines.
• To highlight progress in self-assembly, characterization, and design principles for metal-free organic architectures in water.

Main Methods:

• Discussion of N-substituted imine derivatives (hydrazones and oximes).
• Analysis of the chemical reasons for enhanced stability in aqueous media.
• Review of recent advancements in self-assembly of complex molecules.

Main Results:

• Hydrazones and oximes exhibit superior stability in water compared to simple imines.
• Successful self-assembly of macrocycles, cages, catenanes, and knots in aqueous media.
• Demonstration of metal-free organic architectures with well-defined structures.

Conclusions:

• N-substituted imine derivatives provide robust platforms for aqueous dynamic covalent chemistry.
• These molecules are suitable for constructing complex architectures in water for applications like guest recognition and separations.
• The review offers design principles and highlights emerging applications in supramolecular chemistry.