Generation of Multicomponent Molecular Cages using Simultaneous Dynamic Covalent Reactions

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Materials Science

Background:

• Organic cage compounds are highly sought after for diverse applications.
• Developing methods for synthesizing complex, dynamic, and adaptive cage structures remains a challenge.
• Existing methods often lack the ability to precisely control self-assembly and disassembly.

Purpose of the Study:

• To report a novel and accessible synthesis of organic cage architectures.
• To incorporate two distinct dynamic covalent bonds (hydrazones and disulfides) within a single molecular cage.
• To demonstrate the adaptive self-sorting and controlled disassembly capabilities of these new cage structures.

Main Methods:

• Utilizing three distinct functional groups (thiols, aldehydes, and hydrazides) on two simple building blocks.
• Employing spontaneous and selective self-assembly driven by dynamic covalent chemistry.
• Investigating the adaptive self-sorting from complex mixtures and controlled disassembly via component exchange.

Main Results:

• Successfully synthesized novel organic cage architectures containing both hydrazone and disulfide dynamic bonds.
• Demonstrated the formation of complex cages composed of up to ten components linked by twelve reversible covalent bonds.
• Showcased the ability of these cages to adaptively self-sort from virtual mixtures and undergo controlled disassembly.
• Highlighted the selective nature of the self-assembly process.

Conclusions:

• The presented approach offers an effective strategy for synthesizing complex organic cages with multiple dynamic bonds.
• These adaptable cage structures exhibit unique self-sorting capabilities, enabling their isolation from complex mixtures.
• Dynamic covalent chemistry provides a powerful tool for the controlled disassembly and component exchange in these novel architectures.
• This work opens new avenues for designing functional materials with tunable properties and responsive behaviors.