Charging effects on bonding and catalyzed oxidation of CO on Au8 clusters on MgO

被引：1299
作者：
Yoon, B
Häkkinen, H
Landman, U
Wörz, AS
Antonietti, JM
Abbet, S
Judai, K
Heiz, U
机构：
[1] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[2] Tech Univ Munich, Lehrstuhl Phys Chem 1, Dept Chem, D-85747 Garching, Germany
来源：
SCIENCE | 2005年 / 307卷 / 5708期
关键词：
D O I：
10.1126/science.1104168
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Gold octamers (Au-8) bound to oxygen-vacancy F-center defects on Mg(001) are the smallest clusters to catalyze the low-temperature oxidation of CO to CO2, whereas clusters deposited on close-to-perfect magnesia surfaces remain chemically inert. Charging of the supported clusters plays a key role in promoting their chemical activity. Infrared measurements of the stretch vibration of CO adsorbed on mass-selected gold octamers soft-landed on MgO(001) with coadsorbed O-2 show a red shift on an F-center-rich surface with respect to the perfect surface. The experiments agree with quantum ab initio calculations that predict that a red shift of the C-O vibration should arise via electron back-donation to the CO antibonding orbital.
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收藏
页码：403 / 407
页数：5
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