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• 作者：Wenjun Du ; Shan Jin ; Lin Xiong ; Man Chen ; Jun Zhang ; Xuejuan Zou ; Yong PeiShuxin Wang ; Manzhou Zhu
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：139
• 期：4
• 页码：1618-1624
• 全文大小：542K
• ISSN：1520-5126

文摘

A large thiolate/phosphine coprotected Ag₅₀(Dppm)₆(SR)₃₀ nanocluster was synthesized through the further growth of Ag₄₄(SR)₃₀ nanocluster and characterized by X-ray photoelectron spectroscopy (XPS), electrospray ionization mass spectrometry (ESI-MS), and single-crystal X-ray analysis. This new nanocluster comprised a 32-metal-atom dodecahedral kernel and two symmetrical Ag₉(SR)₁₅P₆ ring motifs. The 20 valence electrons correspond to shell closure in the Jellium model. Moreover, this nanocluster could be alloyed by templated/galvanic metal exchange to the homologue Au_xAg_50–x(Dppm)₆(SR)₃₀ nanocluster; the latter showed much higher thermal stability than the Ag₅₀(Dppm)₆(SR)₃₀ nanocluster. Further experiments were conducted to study the optical, electrical, and photoluminescence properties of both nanoclusters. Our work not only reports two new larger size nanoclusters but also reveals a new way to synthesize larger size silver and alloy nanoclusters, that is, controlled growth/alloying.