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Synthesis and Characterization of Supramolecular Colloids

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Sulfonated Module Aggregation for Ultrahigh Birefringence in Aqueous-Processable Crystals.

Congcong Jin¹, Yang Li², Chong-An Chen¹

¹Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea.

Journal of the American Chemical Society

|October 14, 2025

Summary

This summary is machine-generated.

Researchers developed a sulfonated module aggregation strategy to create aqueous-processable birefringent crystals with high optical anisotropy. A novel pyrenetetrasulfonate salt achieved record birefringence (0.811), advancing optical material design.

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Area of Science:

Materials Science
Optics and Photonics
Crystallography

Background:

Birefringent crystals are crucial for modulating polarized light in advanced optics.
Progress relies on evolving π-conjugated "material genes" but faces challenges with aqueous processability due to hydrophobic skeletons.
Hydrophobicity hinders industrial applications of extended π-conjugated systems.

Purpose of the Study:

To develop a strategy for simultaneous optimization of optical anisotropy and aqueous processability in birefringent crystals.
To synthesize and characterize novel pyrenetetrasulfonate (PTS) salts for advanced optical applications.
To investigate the structure-property relationships governing birefringence and processability.

Main Methods:

Employed a "sulfonated module aggregation" strategy.
Synthesized five 1,3,6,8-pyrenetetrasulfonate (PTS) salts using a mild evaporation method.
Characterized optical anisotropy (birefringence) and aqueous processability; performed high-accuracy quantum chemical calculations.

Main Results:

Synthesized PTS salts exhibited large birefringence values from 0.558 to 0.811 @ 546 nm.
Na₂(4-HPyH)₂(PTS)·H₂O demonstrated a record-high birefringence (Δn = 0.811 @ 546 nm) with enhanced aqueous processability and a wide band gap (3.05 eV).
Quantum chemical calculations revealed a "supralinear polarizability anisotropy" effect enhancing optical properties upon π-module aggregation.

Conclusions:

The sulfonated module aggregation strategy successfully yields aqueous-processable birefringent crystals with high optical anisotropy.
Na₂(4-HPyH)₂(PTS)·H₂O is a highly promising material for advanced optical applications.
This work provides a new paradigm for designing birefringent materials and expands the theoretical understanding of supralinear optical property enhancement.