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A fluorescent controllable supramolecular crosslinked polymer constructed by complementary metal coordination

Xiaohui Huang¹, Shengyong Liu¹, Shenghui Rao¹

¹Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China. lh@jxust.edu.cn.

Dalton Transactions (Cambridge, England : 2003)

|October 2, 2023

Summary

Researchers designed two monomers that self-assemble with zinc ions to create supramolecular crosslinked polymers (SCPs). These polymers can form gels and exhibit tunable fluorescence, offering potential for smart material applications.

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Polymer Chemistry
Supramolecular Chemistry
Materials Science

Background:

Terpyridine-metal coordination is a key interaction for building supramolecular structures.
Designing monomers with specific coordination sites is crucial for controlled self-assembly.

Purpose of the Study:

To design and synthesize novel monomers (M1 and M2) capable of forming supramolecular crosslinked polymers (SCPs).
To investigate the self-assembly process and properties of the resulting SCPs using zinc(II) ions.
To explore the potential for stimuli-responsive behavior in the synthesized materials.

Main Methods:

Monomer synthesis and characterization.
Supramolecular polymerization using M1, M2, and Zn(OTf)₂.
Characterization of SCPs via ¹H NMR, 2D COSY, 2D NOESY, UV-Vis, fluorescence, viscosity, and TEM.

Main Results:

Successful self-assembly of M1 and M2 with Zn(OTf)₂ into SCPs via terpyridine-metal coordination.
SCP molecular weight is dependent on initial monomer concentration.
SCPs form supramolecular polymer gels at high concentrations with reversible gel-sol transitions upon heating/cooling.
Fluorescence of SCPs can be modulated by acid-base stimuli.

Conclusions:

The study demonstrates a novel approach to creating metal-coordinated SCPs with tunable properties.
The developed system exhibits responsive behavior, transitioning between solution and gel states and showing pH-dependent fluorescence.
These findings pave the way for developing advanced supramolecular materials for various applications.