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Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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Updated: May 15, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

Metal-Ligand Bonds Based Reprogrammable and Re-Processable Supramolecular Liquid Crystal Elastomer Network.

Xiaorui Zhou¹, Binjie Jin², Zhan Zhu¹

¹State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.

Angewandte Chemie (International Ed. in English)

|August 1, 2024

Summary

This summary is machine-generated.

This study introduces novel liquid crystal elastomers (LCEs) using metal-ligand bonds. These LCEs offer both stability for programmed alignment and recyclability, overcoming limitations of traditional dynamic covalent or supramolecular networks.

Keywords:

Meta-ligand bonds liquid crystal elastomer smart material stimuli-responsive polymers

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Last Updated: May 15, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

Area of Science:

Materials Science
Polymer Chemistry
Soft Matter Physics

Background:

Dynamic covalent bonds in liquid crystal elastomers (LCEs) enable network rearrangement and reversible actuation but are difficult to recycle.
Supramolecular interactions offer recyclability but lack stability for programmed alignment under external stimuli.
A significant challenge lies in creating LCEs with both supramolecular-like exchangeability and covalent bond-level stability.

Purpose of the Study:

To develop a novel liquid crystal elastomer (LCE) with both network exchangeability and stable programmed alignment.
To utilize metal-ligand bonds as crosslinking points to achieve these properties.
To demonstrate the material's potential for fabricating versatile actuators.

Main Methods:

Synthesized LCEs utilizing metal-ligand bonds as crosslinking points.
Investigated the dynamic properties of the metal-ligand bonds at different temperatures.
Demonstrated the ability to repeatedly encode and maintain mesogen alignment.
Showcased reshaping capabilities via solution casting after complete bond dissociation.

Main Results:

Metal-ligand crosslinked LCEs exhibit stable mesogen alignment below the bond dissociation temperature.
The bond exchange rate is sufficiently slow for programming and actuation below dissociation temperature.
Complete dissociation of metal-ligand bonds at high temperatures allows for complete network dissolution and reshaping.
The developed LCEs were successfully fabricated into functional actuators.

Conclusions:

Metal-ligand bonds provide a unique crosslinking strategy for LCEs, balancing stability and recyclability.
This approach overcomes the limitations of traditional dynamic covalent and supramolecular LCEs.
The resulting LCEs are highly versatile for creating advanced soft actuators and programmable materials.