Gold nanoparticles immobilized on lipoic acid functionalized SBA-15: Synthesis, characterization and catalytic applications

Gold nanoparticles immobilized on lipoic acid functionalized SBA-15 (SBA-LAG) catalyst was synthesized via functionalization of SBA-15 with propylamine followed by tethering of lipoic acid and immobilization of gold nanoparticles. The structural and texctural characteristics of the catalyst have been determined by N2 adsorption–desorption and low-angle XRD. The successive attachment of spacers has been characterized by 13C CP-MAS NMR, FT-IR and TG-DTA. The size, shape, surface composition and oxidation state of gold nanoparticles have been determined by XRD, TEM and XPS techniques. SBA-LAG catalyst is found to be an efficient solid catalyst for producing good to excellent yields of propargylamines by condensing three-components such as (i) amine, (ii) aldehyde and (iii) alkyne in one-pot under solvent-free conditions.

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► SBA-LAG is a new hexagonally ordered mesoporous heterogeneous catalyst.
► Lipoic acid spacer acts as anchoring point to SBA-15 and capping agent for AuNPs.
► SBA-LAG is a solvent-free and leaching-free catalyst.
► SBA-LAG is a highly efficient catalyst for propargylamines synthesis.
► SBA-LAG is a stable catalyst and minimizes diffusion limitations.