Stibine-protected Au 13 nanoclusters: syntheses, properties and facile conversion to GSH-protected Au 25 nanocluster
作者： Ying-Zhou Li , Rakesh Ganguly , Kar Yiu Hong , Yongxin Li , Malcolm Eugene Tessensohn
DOI: 10.1039/C8SC03132K
关键词:
摘要: Monostibine-protected ionic Au13 nanoclusters, namely, [Au13(L)8(Cl)4][Cl] (L= SbPh3, 2a·Cl; Sb(p-tolyl)3, 2b·Cl) were prepared by the direct reduction of Au(L)Cl with NaBH4 in dichloromethane. Anion exchange 2a·Cl afforded [Au13(SbPh3)8(Cl)4][X] (X = PF6, 2a·PF6; BPh4, 2a·BPh4). All these have been characterized multinuclear NMR, ESI-MS and UV-Vis spectroscopy. Crystallographic analysis 2a·BPh4 reveals that cation possesses C2v symmetry tridecagold core adopts a closed icosahedron configuration. The weaker coordinating ability stibine ligands leads to ready reaction 2b·Cl PPh3 or glutathione (GSH) form smaller phosphine-protected cluster [Au11(PPh3)8Cl2][Cl] larger thiolate-protected Au25(SG)18, respectively. In latter reaction, addition small amount (0.5 3.5 equivalents) suitable oxidant such as K3(Fe(CN)6 accelerates conversion rate significantly.
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