Single-Molecule Reactor Based on the Excluded Volume Effect of Bottlebrush Polymers

Area of Science:

• Polymer Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Achieving precise spatiotemporal control of chemical reactions remains a significant challenge.
• Living organisms exhibit remarkable control over chemical reactions, serving as inspiration for synthetic systems.

Purpose of the Study:

• To develop a novel single-molecule reactor for precise control over polymerization reactions.
• To demonstrate the capability of the reactor to confine distinct polymerization processes without cross-reactivity.

Main Methods:

• Design and synthesis of bottlebrush polymers to act as single-molecule reactors (BBPRs).
• Utilizing the excluded volume effect (EVE) from dense side chains to create confined reaction spaces.
• Confining two distinct polymerization reactions: ring-opening metathesis polymerization and Suzuki-Miyaura polymerization within individual BBPRs.

Main Results:

• BBPRs effectively confine polymerization reactions due to the excluded volume effect (EVE).
• The reactors allow selective permeability for small molecules and linear polymer chains while preventing inter-reactor coupling.
• Two distinct polymerization reactions were successfully confined within BBPRs without significant cross-reactivity.

Conclusions:

• The bottlebrush polymer reactor (BBPR) offers a versatile platform for precision control of chemical reactions.
• BBPRs provide adjustable confinement, selective permeability, and facile product release, establishing a new paradigm for controlled synthesis.