X-ray magnetic circular dichroism of size-selected, thiolated gold clusters
X-ray magnetic circular dichroism of size-selected, thiolated gold clusters
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DOI:
10.1021/ja062815z
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发表时间:
2006-09-20
影响因子:
15
通讯作者:
Tsukuda, Tatsuya
中科院分区:
文献类型:
--
作者:
Negishi, Yuichi;Tsunoyama, Hironori;Tsukuda, Tatsuya
We report herein the X-ray magnetic circular dichroism (XMCD) at the Au L2,3edges of a series of Au clusters protected by glutathione (GSH). The samples used here included AuN(SG)Mwith (N,M) = (10, 10), (15, 13), (18, 14), (22, 16), (25, 18), (29, 20), (39, 24) and a sodium gold(I) thiomalate (SGT) as a reference. Magnetic moments per cluster were found to be increased with size, whereas those per Au−S bond were nearly constant. This finding suggests that a localized hole created by Au−S bonding at the gold/glutathione interface, rather than the quantum size effect, is responsible for the spin polarization of gold clusters.