Synthesis, structural characterization and transformation of an eight-electron superatomic alloy, [Au@Ag-19{S2P(OPr)(2)}(12)] - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Nanoscale Année : 2018

Synthesis, structural characterization and transformation of an eight-electron superatomic alloy, [Au@Ag-19{S2P(OPr)(2)}(12)]

Samia Kahlal
Yu-Chiao Liu
  • Fonction : Auteur correspondant
Ming-Hsi Chiang
  • Fonction : Auteur
C. W. Liu
  • Fonction : Auteur correspondant

Résumé

Controlling the metal nanoclusters with atomic precision is highly difficult and further studies on their transformation reactions are even more challenging. Herein we report the controlled formation of a silver alloy nanocluster [AuAg19{S2P(OnPr)(2)}(12)] (1) from an Ag-20 template via a galvanic exchange route. X-ray structural analysis reveals that the alloy structure comprises of a gold-centered Ag-12 icosahedron, Au@Ag-12, capped by seven silver atoms. Interestingly upon reacting with one equiv. of silver(I) salt, (1) can transform into a higher nuclearity nanocluster, [Au@Ag-20{S2P(OnPr)(2)}(12)](+) (2). The conversion process is studied via ESI mass spectrometry and P-31 NMR spectroscopy. This kind of size-structural transformation at the single atom level is quite remarkable. Furthermore, the compositions of all the doped nanoclusters (1, 2) were fully characterized with ESI-MS and EDS. The blue shift depicted in the UV-visible and emission spectra of the doped nanoclusters (1, 2) compared with the precursor, Ag-20, demonstrates that the doping atoms have significant effects on the electronic structures.

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hal-01807074 , version 1 (13-07-2018)

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Yan-Ru Lin, Pilli V. V. N. Kishore, Jian-Hong Liao, Samia Kahlal, Yu-Chiao Liu, et al.. Synthesis, structural characterization and transformation of an eight-electron superatomic alloy, [Au@Ag-19{S2P(OPr)(2)}(12)]. Nanoscale, 2018, 10 (15), pp.6855-6860. ⟨10.1039/c8nr00172c⟩. ⟨hal-01807074⟩
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