3 years ago

Atomically Precise Bimetallic Au19Cu30 Nanocluster with an Icosidodecahedral Cu30 Shell and an Alkynyl–Cu Interface

Atomically Precise Bimetallic Au19Cu30 Nanocluster with an Icosidodecahedral Cu30 Shell and an Alkynyl–Cu Interface
Quan-Ming Wang, Xian-Kai Wan, Qing Tang, De-en Jiang, Xiao-Ling Cheng, Guoxiang Hu, Ying-Zi Han
Bimetallic nanoclusters Au19Cu30 with chemical composition of [Au19Cu30(C≡CR)22(Ph3P)6Cl2](NO3)3 (where RC≡C is from 3-ethynylthiophene (H3C4S-3—C≡CH) or ethynylbenzene (PhC≡CH)) has been synthesized. Single X-ray structural analysis reveals that Au19Cu30 has a multishelled core structure of Au@Au12@Cu30@Au6, comprising a centered icosahedral Au13 (Au@Au12) surrounded by an icosidodecahedral Cu30 shell and an outmost shell of a chairlike hexagonal Au6. The alkynyl carbon is bound to the hollow sites on the Au19Cu30 nanocluster surface, which is a novel interfacial binding mode in alkynyl-protected alloy nanoclusters. The Cu30 icosidodecahedron is unprecedented and Au19Cu30 represents the first alkynyl-protected Au–Cu alloy nanocluster.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b04622

DOI: 10.1021/jacs.7b04622

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