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A Micropatterning Assay for Measuring Cell Chirality
Published on: March 11, 2022
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Assembly-Sized-Controlled Chirality: Increase from Single Molecule to Micrometer Scale Enhances Chiroptical Activity.
Zhen Liu1, Jia-Hui Wang1,2, Hong-Xiao Li1
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518037, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 24, 2025
Summary
Highly emissive chiral materials show amplified chiroptical activity with increasing aggregate size. This study proposes a mechanism linking assembly size to chiroptical response, crucial for developing advanced chiral materials.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Photophysics
Background:
- Achieving high dissymmetry factors in chiroptical materials is a significant challenge.
- A systematic theory correlating assembly size with chiroptical properties is lacking.
- Chiroptical materials are essential for applications in sensing, imaging, and optoelectronics.
Purpose of the Study:
- To develop a highly emissive fluorophore with tunable chiroptical activity.
- To investigate the influence of aggregate/assembly size on chiroptical properties.
- To propose a mechanism for the occurrence and amplification of chiroptical activity based on assembly size.
Main Methods:
- Covalent linkage of a fluorescent dicyanodistyrylbenzene (DCS) unit with chiral cholesterol (Chol) to form DCS-Chol.
- Characterization of DCS-Chol in various states: solution, powder, aggregate, gel, thin film, and liquid crystal (LC) encapsulation.
- Measurement of fluorescence quantum yield, circular dichroism (CD), and circularly polarized luminescence (CPL).
Main Results:
- DCS-Chol exhibits excellent fluorescence quantum yields (36-74%) across different states.
- A positive correlation was observed between the size of DCS-Chol aggregates/assemblies and the amplification of CD and CPL signals.
- Chiroptical activity increased with assembly size, from single molecules to LC-encapsulated states (up to 105 nm).
Conclusions:
- Assembly size is a critical factor in achieving and amplifying chiroptical activity in emissive materials.
- The proposed mechanism provides a theoretical framework for designing highly dissymmetric chiroptical materials.
- This work opens new avenues for developing advanced chiral optical materials with enhanced performance.
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