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Dynamically Switchable Global Chirality in Racemic Polymer Systems.

Zixiang He¹, Jiaying Guo¹, Yuqing Wang¹

¹State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.

Angewandte Chemie (International Ed. in English)

|November 11, 2024

Summary

This summary is machine-generated.

This study introduces a novel method to create global chirality in racemic polymers using polymerization-induced chiral self-assembly (PICSA). This breakthrough enables switchable optical activity in materials previously considered inactive.

Keywords:

Chiral conflict Global chirality Helicity inversion Liquid-crystalline Racemic polymer

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Area of Science:

Polymer Chemistry
Supramolecular Chemistry
Materials Science

Background:

Racemic polymers are typically optically inactive, limiting their applications.
Chirality is crucial for many advanced functional materials.

Purpose of the Study:

To develop a method for inducing global chirality in racemic copolymer assemblies.
To explore the dynamic switching of supramolecular chirality in these polymers.

Main Methods:

Step-wise polymerization-induced chiral self-assembly (PICSA) of racemic monomers.
Controlled manipulation of enantiomeric segment number and sequence.
Analysis of supramolecular stacking and liquid crystallinity.

Main Results:

Precisely generated global chirality in racemic copolymer nanoaggregates without external chiral agents.
Demonstrated dynamic switching of supramolecular chirality via competing chiral effects.
Identified the role of mesogen stacking and liquid crystallinity in chiral communication.

Conclusions:

Challenged the notion that racemic systems lack optical activity.
Highlighted potential applications in functional racemic polymer materials.
Provided insights into racemates evolving towards homochirality.