Crystal Structure of Selenolate-Protected Au₂₄(SeR)₂₀ Nanocluster

Abstract

We report the X-ray structure of a selenolate-capped Au24(SeR)20 nanocluster (R = C6H5). It exhibits a prolate Au8 kernel, which can be viewed as two tetrahedral Au4 units cross-joined together without sharing any Au atoms. The kernel is protected by two trimeric Au3(SeR)4 staple-like motifs as well as two pentameric Au5(SeR)6 staple motifs. Compared to the reported gold-thiolate nanocluster structures, the features of the Au8 kernel and pentameric Au5(SeR)6 staple motif are unprecedented and provide a structural basis for understanding the gold-selenolate nanoclusters.

Isolation and Tandem Mass Spectrometric Identification of a Stable Monolayer Protected Silver–Palladium Alloy Cluster

“…13−16 Among them, gold clusters have been studied extensively. Crystal structures of several gold clusters such as Au 23 , 17 49 and Ag 44 33 have been reported, whereas only one alloy, namely, Cu n Au 25−n (n = 1−9), 50 is known with such monolayers. So far, to the best of our knowledge, there is no report on Ag−Pd alloy clusters.…”

Bonding properties of thiolate-protected gold nanoclusters and structural analogs from X-ray absorption spectroscopy

“…To date, icosahedral, face-centered-cubic (FCC)-ordered and smaller Au core ( < 13 Au atoms) structures have been reported crystallographically for various Au n (SR) m sizes [19,[21][22][23][24][25][26][27][28][29][30]. A couple of selenolate-protected Au NCs have also been recently elucidated with icosahedral or small Au 8 core structures [31,32]. In the last few years, a number of surface structures in addition to the monomeric and dimeric staple-like motifs were identified such as a trimeric staple-like motif [28], tetrameric staple-like motif [29,30], μ 3 sulfide coordination [25], bridging thiolate motif [24], and ring-like motifs (long Au-SR oligomers) [27,33].…”

“…Figure 1 presents the diversity of thiolate-protected Au NC structures. Currently, only the dimeric staple-like motif and ring-like motif have been confirmed to exist in structurally analogs selenolate-protected Au NCs [31,32].…”

Au19 Nanocluster Featuring a V-Shaped Alkynyl–Gold Motif

“…Previously, Jin et al reported a thiolate protected Au 19 cluster with a composition of Au 19 (SCH 2 CH 2 Ph) 13 based on mass spectrometry, 28 and Jiang predicted from density functional theory (DFT) that this cluster has a defective icosahedral Au 11 core wrapped by two RS−Au−SR and three RS−Au−SR−Au−SR staple motifs. 29 But its experimental structure is still unknown.…”