Chromatographic isolation of "missing" Au55 clusters protected by alkanethiolates
Chromatographic isolation of "missing" Au55 clusters protected by alkanethiolates
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DOI：
10.1021/ja061659t
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发表时间：
2006-05-10
影响因子：
15
通讯作者：
Tsukuda, Tatsuya
中科院分区：
文献类型：
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作者：
Tsunoyama, Hironori;Negishi, Yuichi;Tsukuda, Tatsuya
我们报告的第一个合成的烷硫醇保护的Au55（11 kDa），这一直是一个“失踪”的对应物Schmid的Au55（PR3）12Cl6。Au：SCx团簇（x= 12，18）是通过烷基乙醇胺（CxSH）与聚合物稳定的Au团簇（λ 1.3 nm）反应制备的，随后在纯CxSH中温育。通过循环凝胶渗透色谱法成功地将得到的团簇分离成Au 38：SCx和Au 55：SCx，并通过激光解吸电离质谱法鉴定。的Au 55：SCx团簇表现出结构化的光谱，表明分子的性质。硫醇单分子膜被认为是液体样的基础上的红外光谱和单层厚度，这是从流体动力学直径估计。
We report on the first synthesis of alkanethiolate-protected Au55(11 kDa), which has been a “missing” counterpart of Schmid's Au55(PR3)12Cl6. Au:SCxclusters (x= 12, 18) were prepared by the reaction of alkanethiol (CxSH) with polymer-stabilized Au clusters (∼1.3 nm) and subsequently incubated in neat CxSH. The resulting clusters were successfully fractionated by recycling gel permeation chromatography into Au∼38:SCxand Au∼55:SCxand identified by laser-desorption ionization mass spectrometry. The Au∼55:SCxclusters exhibited structured optical spectra, suggesting molecular-like properties. The thiolate monolayers were found to be liquid-like on the basis of the IR spectrum and the monolayer thickness, which was estimated from the hydrodynamic diameter.