Isolation and Total Structure Determination of an All-Alkynyl-Protected Gold Nanocluster Au144

Angewandte Chemie
Zhen LeiQuan-Ming Wang

Abstract

Total structure determination of a ligand-protected gold nanocluster, Au144 , has been successfully carried out. The composition of title nanocluster is Au144 (C≡CAr)60 (1; Ar=2-FC6 H4 -). The cluster 1 exhibits a quasi-spherical Russian doll-like architecture, comprising a Au54 two-shelled Mackay icosahedron (Au12 @Au42 ), which is further enclosed by a Au60 anti-Mackay icosahedral shell. The Au114 kernel is enwrapped by thirty linear ArC≡C-Au-C≡CAr staple motifs. The absorption spectrum of 1 shows two bands at 560 and 620 nm. This spectrum is distinctly different from that of thiolated Au144 , which was predicted to have an almost identical metal kernel and very similar ligands arrangement in 1. These facts indicate the molecule-like behavior of 1 and significant involvement of ligands in the electronic structure of 1. The cluster 1 is hitherto the largest coinage metal nanocluster with atomically precise molecular structure in the alkynyl family. The work not only addresses the concern of structural information of Au144 , which had been long-pursued, but also provides an interesting example showing ligand effects on the optical properties of ligand protected metal nanoclusters.

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Citations

Aug 29, 2018·Chemical Communications : Chem Comm·Ting WangQuan-Ming Wang
Nov 27, 2018·Angewandte Chemie·Jiao-Jiao LiQuan-Ming Wang
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Oct 3, 2018·Accounts of Chemical Research·Zhen LeiQuan-Ming Wang

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