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Gold Nanoparticle Synthesis
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pH responsive histidin-2-ylidene stabilized gold nanoparticles.

Adam J Young1, Constantin Eisen2, Guilherme M D M Rubio2

  • 1Gray Centre for Advanced Materials, School of Mathematics and Physical Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, UK.

Journal of Inorganic Biochemistry
|August 2, 2019
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Summary

Researchers developed water-soluble gold nanoparticles using chiral N-heterocyclic carbene ligands derived from L-histidine. These nanoparticles exhibit excellent stability in aqueous solutions, paving the way for biological applications.

Keywords:
Gold nanoparticlesN-Heterocyclic carbenepH response

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Area of Science:

  • * Nanoparticle synthesis and stabilization.
  • * Organometallic chemistry.
  • * Green chemistry and chiral ligand design.

Background:

  • * N-heterocyclic carbene (NHC)-stabilized metal nanoparticles offer enhanced stability due to strong carbon-metal bonds.
  • * Limited examples of water-soluble NHC-stabilized metal nanoparticles exist, hindering biological applications.
  • * Water dispersibility and stability in biological solvents are crucial for in vivo applications.

Purpose of the Study:

  • * To synthesize water-soluble N-heterocyclic carbene-stabilized gold nanoparticles using chiral ligands.
  • * To investigate the stability and properties of these histidine-derived gold nanoparticles in aqueous solutions.
  • * To explore their potential for biological applications.

Main Methods:

  • * Synthesis of chiral NHC ligands from L-histidine via N-acetyl-L-histidine ethyl ester.
  • * Formation of imidazolium salts using alkylation agents (methyl iodide or 2-iodopropane).
  • * Preparation of gold nanoparticles by reacting imidazolium salts with [Au(SMe2)Cl] and subsequent saponification of ester groups.

Main Results:

  • * Successfully synthesized water-soluble, pH-responsive NHC-stabilized gold nanoparticles.
  • * Demonstrated remarkable stability of the gold nanoparticles in aqueous solutions over extended periods (months).
  • * Utilized a chiral pool approach, incorporating L-histidine for ligand synthesis.

Conclusions:

  • * Chiral N-heterocyclic carbene ligands derived from L-histidine enable the creation of stable, water-soluble gold nanoparticles.
  • * The developed nanoparticles possess properties suitable for biological applications due to their stability and water dispersibility.
  • * This work expands the scope of NHC-stabilized nanoparticles for use in aqueous environments.