Click-Ready Gold Nanoparticles from Aqueous Mechanochemistry: 2-Propynylamine as a Reducing Agent and Surface Ligand
Amber L. Garcia, Brian S. Mitchell, Amanda Reusch, Mark J. Fink, Juan P. Hinestroza, Yelin Ko, Julie P. Vanegas
TL;DR
A new method creates gold nanoparticles using 2-propynylamine, which both reduces gold and stabilizes the particles, making them ready for chemical reactions.
Contribution
The use of 2-propynylamine as a dual-function reagent for synthesizing click-ready gold nanoparticles in a single step.
Findings
Gold nanoparticles with an average diameter of 4.0 ± 1.0 nm were synthesized using 2-propynylamine.
The nanoparticles have a surface plasmon resonance band at 520 nm and a terminal alkyne group for further modification.
The method eliminates the need for external reducing or capping agents.
Abstract
We report a rapid aqueous method for synthesizing monodisperse gold nanoparticles (AuNPs), employing 2-propynylamine as both an intrinsic reducing agent and a surface-stabilizing ligand. This self-mediated process—achieved in a single step—yields spherical AuNPs with an average diameter of 4.0 ± 1.0 nm and a well-defined localized surface plasmon resonance band centered at 520 nm. Acting as a bifunctional molecule, 2-propynylamine simultaneously reduces HAuCl4·3H2O to elemental gold and passivates the nanoparticle surface through coordination via the amine group, while preserving a terminal alkyne (–C≡CH) functionality. This reactive moiety remains exposed and chemically accessible, enabling post-synthetic modification through Cu(I)-catalyzed azide–alkyne cycloaddition. Control experiments using alternate milling times and vial composition confirmed the essential role of 2-propynylamine…
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Taxonomy
TopicsNanocluster Synthesis and Applications · Gold and Silver Nanoparticles Synthesis and Applications · Click Chemistry and Applications