Doping 25-Atom and 38-Atom Gold Nanoclusters with Palladium

作者：Qian Huifeng; Ellen Barry; Zhu Yan; Jin Rongchao^*

来源：Acta Physico - Chimica Sinica, 2011, 27(3): 513-519.

DOI：10.3866/PKU.WHXB20110304

• Gold
• Nanocluster
• Doping
• Palladium

In this work, we describe two synthetic procedures for preparing palladium doped 25-atom nanoclusters (referred to as Pd1Au24(SR)(18), where - SR represents thiolate, R=C2H4Ph). Pure Pd1Au24 (SC2H4Ph)(18) nanoclusters are isolated by solvent extraction and size exclusion chromatography. Mass spectrometry and optical spectroscopy analyses demonstrate that the Pd1Au24(SC2H4Ph)(18) nanocluster adopts the same core-shell structure as that of the homogold Au-25(SC2H4Ph)(18) nanocluster, that is, a Pd- or Au-centered icosahedron surrounded by six Au-2(SR)(3) "staple"-like motifs. Similar doping behavior has also been observed in 38-atom M-38(SR)(24) (M: metal) nanoclusters, indicating the unique behavior of Pd dopant being preferentially located in the icosahedral center. The catalytic activity of Pd1Au24(SC2H4Ph)(18) has also been evaluated for the selective hydrogenation of alpha,beta-unsaturated ketone (e. g., benzalacetone) to alpha,beta-unsaturated alcohol, and a 42% conversion of benzalacetone is attained.

• 出版日期2011-3