Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms10414
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Funding
- Funding Program for Next Generation World-leading Researchers (NEXT Program) [GR-003]
- 'Elements Strategy Initiative to Form Core Research Center'
- MEXT (Ministry of Education, Culture, Sports, Science and Technology) [26248003]
- Grant for Basic Science Research Projects from The Sumitomo Foundation
- Grants-in-Aid for Scientific Research [26248003, 15H00883, 14J10502, 25288009, 15H00763] Funding Source: KAKEN
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Unique thermal properties of metal clusters are believed to originate from the hierarchy of the bonding. However, an atomic-level understanding of how the bond stiffnesses are affected by the atomic packing of a metal cluster and the interfacial structure with the surrounding environment has not been attained to date. Here we elucidate the hierarchy in the bond stiffness in thiolate-protected, icosahedral-based gold clusters Au-25(SC2H4Ph)(18), Au-38(SC2H4Ph)(24) and Au-144(SC2H4Ph)(60) by analysing Au L-3-edge extended X-ray absorption fine structure data. The Au-Au bonds have different stiffnesses depending on their lengths. The long Au-Au bonds, which are more flexible than those in the bulk metal, are located at the icosahedral-based gold core surface. The short Au-Au bonds, which are stiffer than those in the bulk metal, are mainly distributed along the radial direction and form a cyclic structural backbone with the rigid Au-SR oligomers.
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