Formation of Pd_n(SR)_m clusters (n<60) in the reactions of PdCl₂ and RSH (R=n-C₁₈H₃₇, n-C₁₂H₂₅)

详细信息    查看全文

• 作者：Negishi ; Yuichi ; Murayama ; Haruno ; Tsukuda ; Tatsuya
• 刊名：Chemical Physics Letters
• 出版年：2002
• 出版时间：December 20, 2002
• 年：2002
• 卷：366
• 期：5-6
• 页码：561-566
• 全文大小：270 K

文摘

Mass spectroscopic analysis revealed that Pd clusters passivated by thiolates and the stoichiometric thiolate complexes, Pd_n(SR)_2n(n=5,6), are formed in the reactions between palladium chloride and n-alkanethiols (RSH: R=n-C₁₈H₃₇, n-C₁₂H₂₅) in toluene. The Pd clusters thus formed are formulated as Pd_n(SR)_m with m0.6n. The cluster sizes, distributed in the range of 5≤n≤60, are consistent with their core diameters of 1 nm observed by TEM. A gap of 2 eV was observed in the optical transition of the Pd_n(SR)_m clusters showing the emergence of non-metallic properties as a result of size reduction.