Size Matters: Influence of Gold‐to‐Ligand Ratio and Sulfur‐Sulfur Distance of Linear Thioether Heptamers on the Size of Gold Nanoparticles. Issue 4 (1st March 2017)

• Record Type: Journal Article
• Authors: Lehmann, Mario; Peters, Erich Henrik; Mayor, Marcel
• Is Part Of: Helvetica chimica acta. Volume 100:Issue 4(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-01
• Subjects: Gold -- Nanoparticles -- S ligands -- Size control -- Oligomerization; Chemistry -- Periodicals; Chemistry, Analytical -- periodicals; Chimie -- Périodiques; 540
• DOI: 10.1002/hlca.201600395
• Languages: English
• ISSNs: 0018-019X

Abstract

Abstract : A systematic investigation of two parameters steering the size of linear octadentate heptamer‐coated gold nanoparticles (AuNPs) is presented, being i ) the chemical structure (sulfur‐sulfur distance) of the coating thioether heptamer ligand and ii ) the ratio of ligand to tetrachloroauric acid (HAuCl4 ) reduced during the formation of the AuNPs. For this purpose, a novel terphenyl‐based thioether heptamer (Ter ) is synthesized via an end‐capping oligomerization strategy, comprising an increased distance between neighboring sulfur atoms in the ligand backbone compared to the meta ‐xylene‐ (Xyl ) and tetraphenylmethane‐ (TPM ) based heptamers. While for both investigated parameters a clear trend to various‐sized NPs is shown, a stronger influence in the resulting sizes is observed by alteration of ligand to gold‐ratio. Remarkable processability‐ and long‐term stability‐features were observed for AuNPs stabilized by the bulky tetraphenylmethane‐based heptamer (TPM ). Abstract :