title: Facile, large-scale synthesis of dodecanethiol-stabilized Au38 clusters.
abstract: It has long been a major challenge to achieve synthetic control over size and monodispersity of gold thiolate nanoclusters. Among the reported Aun thiolate clusters, Au38 has been shown to be particularly stable but was only obtained as a minor product in previous syntheses. In this work, we report a bulk solution synthetic method that permits large-scale, facile synthesis of truly monodisperse Au38 nanoclusters. This new method explores a two-phase ligand exchange process utilizing glutathione-capped Aun clusters as the starting material. The ligand exchange process with neat dodecanethiols causes gold core etching and secondary growth of clusters, and eventually leads to monodisperse Au38 clusters in high purity, which eliminates nontrivial postsynthetic separation steps. This method can be readily scaled up to synthesize Au38(SC12H25)24 in large quantities and thus makes the approach and Au38 nanoclusters of broad utility.
authors.affiliation: Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: Huifeng
authors.initials: H
authors.lastname: Qian
authors.forename: Manzhou
authors.initials: M
authors.lastname: Zhu
authors.forename: Ulla N
authors.initials: UN
authors.lastname: Andersen
authors.forename: Rongchao
authors.initials: R
authors.lastname: Jin
mesh_terms: D006046:Gold / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D009942:Organometallic Compounds; D013438:Sulfhydryl Compounds; C013976:dodecylmercaptan; D006046:Gold