Role of Au<sub>4</sub> Units on the Electronic and Bonding Properties of Au<sub>28</sub>(SR)<sub>20</sub> Nanoclusters from X-ray Spectroscopy
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Bibliographic record
Abstract
The emergence of FCC-ordered core structures in thiolate-protected gold nanoclusters has motivated researchers in this area to reconsider the possibility of nonicosahedral core frameworks. With the recent elucidation of a four-membered FCC-ordered core series (Au 20 (SR) 16, Au 28 (SR) 20, Au 36 (SR) 24, and Au 44 (SR) 28 ), it is now of significant interest to understand how their electronic and bonding properties are influenced by the cluster composition and how they differ from, or may be linked to, their icosahedral counterparts. Of recent, attention has been focused on the presence of small Au 4 units, which comprise the majority of the known FCC-ordered thiolate-protected gold nanocluster core structures. Herein, the Au 28 (SR) 20 nanocluster with a 20 Au atom FCC-ordered core is investigated with temperature-dependent X-ray absorption spectroscopy experiments and ab initio simulations to elucidate the bonding and electronic properties of the second member of the FCC-ordered core series. By comparing the results of Au 28 (SR) 20 with its larger FCC-ordered relative, Au 36 (SR) 24, and its icosahedral counterpart, Au 25 (SR) 18, the significant role of Au 4 core units on the bonding properties of FCC-ordered gold nanoclusters is highlighted in this work.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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