X-ray magnetic circular dichroism of size-selected, thiolated gold clusters.
We report herein the X-ray magnetic circular dichroism (XMCD) at the Au L2,3 edges of a series of Au clusters protected by glutathione (GSH). The samples used here included AuN(SG)M with (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.
Negishi
Yuichi
Y
Research Center for Molecular-Scale Nanoscience, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.
Tsunoyama
Hironori
H
Suzuki
Motohiro
M
Kawamura
Naomi
N
Matsushita
Michio M
MM
Maruyama
Koichi
K
Sugawara
Tadashi
T
Yokoyama
Toshihiko
T
Tsukuda
Tatsuya
T