2019 Fiscal Year Annual Research Report
Synthesis, Characterization and Testing of N-Heterocyclic Carbene-modified Magic Number Metallic Clusters for C-H Oxidation Catalysis
| Project/Area Number |
17H03030
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| Research Institution | Nagoya University |
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Principal Investigator |
CRUDDEN Cathleen 名古屋大学, トランスフォーマティブ生命分子研究所, 客員教授 (10721029)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | Nano Materials / Nanocluster / N-Heterocyclic Carbene / Gold |
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| Outline of Annual Research Achievements |
With the Kakenhi funds, we have made significant progress on the synthesis and characterization of novel nanoclusters. In addition, we have made strides to understanding their properties in terms of stability, interconversions and catalytic reactivity. These results are broken down by cluster type.
Building on the previous work, we strived to make a cluster in which the NHC ligand was the predominant ligand, not the ancillary ligand. To achieve this, we investigated the reduction of well-defined NHC－Au－Cl complexes. This produced clusters composed of an icosahedral Au13 core (similar to the abovementioned Au11) which is an 8-electron superatom. This synthetic success allowed us to study the effect of the structure of NHC ligands, including electronic configuration and steric effects on size, structure, and properties of gold nanoclusters. In particular, X-ray crystallography shows that the clusters with benzyl and naphthyl wingtips are characterized by multiple CH－π and π－π interactions, which rigidify the ligand shell and likely contribute to the exceptionally high photoluminescent quantum yields observed, up to 16.0%, which is significantly greater than that of the most luminescent gold clusters. Subsequent work in our group has identified derivatives that are highly active in photocatalytic reactions.
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| Research Progress Status |
令和元年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和元年度が最終年度であるため、記入しない。
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