Water-Induced Adsorption of Carbon Monoxide and Oxygen on the Gold Dimer Cation
Water-Induced Adsorption of Carbon Monoxide and Oxygen on the Gold Dimer Cation
复制标题
水诱导金二聚体阳离子上一氧化碳和氧气的吸附
DOI：
10.1021/jp501111f
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
T. Ito;et al.
用串联质谱仪和离子陷阱法证明，水分子在金二聚体阳离子Au2+上的预吸附增强了对CO和O2分子的吸附，否则对这些分子是惰性的。CO在Au2(H2O)+上的吸附速率比裸露的Au2+高2个数量级。CO吸附速率的提高是由于反应通道的存在，反应通道断裂了Au-Au键，导致Au(H2O)(CO)+的形成。这种现象可以归因于水分子吸附时Au-Au键的减弱。此外，还观察到H2O的预吸附导致O2在Au2+离子上的吸附显著增强，这可以归因于水吸附后电子密度的变化。
It is demonstrated, using tandem mass spectrometry and ion trap, that preadsorption of a H2O molecule on the gold dimer cation, Au2+, enhances adsorption of CO and O2molecules, which is otherwise inert toward these molecules. The rate of adsorption of CO on Au2(H2O)+was found to be higher by 2 orders of magnitude relative to bare Au2+. The enhancement of the CO adsorption rate is due to the presence of a reaction channel, which cleaves the Au–Au bond, leading to the formation of Au(H2O)(CO)+. Such an observation can be attributed to weakening of the Au–Au bond upon adsorption of a water molecule. Further, it was also observed that preadsorption of H2O leads to dramatic enhancement of O2adsorption on the Au2+ion, which can be attributed to the changes in the electron density following water adsorption.