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Updated: Jan 10, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
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Multidirectionally Controlled Arrangement via Ion-Pairing Assembly of Amphiphilic Charged π-Electronic Systems
Yuto Maruyama1, Biplab Manna2, Koji Harano2,3
1Department of Applied Chemistry, College of Life Sciences, Kusatsu, 525-8577, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|November 25, 2025
Summary
Researchers designed new liquid crystals using charged π-electronic systems and hydrophilic chains. Tuning these chains controls assembly, creating tunable lyotropic chromonic liquid crystals (LCLCs) with potential applications.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Liquid Crystals
Background:
- Lyotropic chromonic liquid crystals (LCLCs) self-assemble via π-π interactions and hydrophobic effects.
- Amphiphilic molecules with hydrophilic substituents are key to forming LCLCs.
Purpose of the Study:
- To investigate how the number and position of triethylene glycol (TEG) chains in porphyrin gold (AuIII) complexes influence their assembly.
- To develop a controllable strategy for designing π-electronic LCLCs with tunable properties.
Main Methods:
- Synthesis of amphiphilic porphyrin Au(III) complexes with varying TEG chain configurations.
- Characterization of liquid crystalline phases using techniques like magnetic field alignment and scanning transmission electron microscopy (STEM).
Main Results:
- A 5,15-TEG-aryl substituted porphyrin Au(III) complex formed lamello-columnar (Lamcol) phases through π-π and proximal interactions.
- The Lamcol phases transitioned to nematic sheet (Nsheet) and isotropic sheet (Iso-sheet) phases in water, dependent on water content and temperature.
- Macroscopic alignment of Lamcol phases was achieved using magnetic fields, with STEM revealing monolayer sheet structures.
Conclusions:
- Tuning the TEG chain positions and numbers in porphyrin Au(III) complexes provides a method to control LCLC assembly.
- This charge-by-charge assembly strategy enables the design of π-electronic LCLCs with predictable structural and phase behaviors.
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