Title: Bulky Surface Ligands Promote Surface Reactivities of [Ag141X12(S-Adm)40]3+ (X=Cl, Br, I) Nanoclusters: Models for Multiple-Twinned Nanoparticles

Authors: Liting Ren, peng yuan, Hai-Feng Su, Sami Malola, Shui-Chao Lin, Zichao Tang, Boon K. Teo, Hannu Häkkinen, Lan-Sun Zheng, and Nanfeng Zheng

Abstract:

Surface ligands play important roles in controlling the size and shape of metal nanoparticles and their surface properties. In this work, we demonstrate that the use of bulky thiolate ligands, along with halides, as the surface capping agent promotes the formation of plasmonic multiple-twinned Ag nanoparticles with high surface reactivities. The title nanocluster [Ag141X12(S-Adm)40]3+ (where X = Cl, Br, I; S-Adm=1-adamantanethiolate) has a multiple-shell structure with an Ag71 core protected by a shell of Ag70X12(S-Adm)40. The Ag71 core can be considered as twenty frequency-two Ag10 tetrahedra fused together with a dislocation that resembles multiple-twinning in nanoparticles. The nanocluster has a strong plasmonic absorption band at 460 nm. Due to the bulkiness of S-Adm, the nanocluster has a low surface thiolate coverage and thus unusually high surface reactivities towards exchange reactions with different ligands, including halides, phenylacetylene and thiols. The cluster can be made water soluble by metathesis with water-soluble thiols, thereby creating new functionalities for potential bioapplications.

Full-Link:http://pubs.acs.org/doi/abs/10.1021/jacs.7b07926