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
Tsukuda, Tatsuya
中科院分区:
化学1区
文献类型:
--
作者:
Negishi, Yuichi;Tsunoyama, Hironori;Tsukuda, Tatsuya

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本文报道了谷胱甘肽(GSH)保护的一系列Au团簇的Au L2,3边的X射线磁性圆二色性(XMCD)。这里使用的样品包括AuN(SG)M(N,M)=(10,10),(15,13),(18,14),(22,16),(25,18),(29,20),(39,24)和硫代苹果酸金(I)钠(SGT)作为参考。发现每个簇的磁矩随着尺寸的增加而增加,而每个Au−S键的磁矩几乎不变。这一发现表明,在金/谷胱甘肽界面处由Au−S键合产生的局部空穴,而不是量子尺寸效应,是金团簇自旋极化的原因。
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.