| Autor: |
Wang, Yu, Su, Haifeng, Ren, Liting, Malola, Sami, Lin, Shuichao, Teo, Boon K., Häkkinen, Hannu, Zheng, Nanfeng |
| Předmět: |
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| Zdroj: |
Angewandte Chemie International Edition; 11/21/2016, Vol. 55 Issue 48, p15152-15156, 5p |
| Abstrakt: |
The synthesis, structure, substitution chemistry, and optical properties of the gold-centered cubic monocationic cluster [Au@Ag8@Au6(C≡CtBu)12]+ are reported. The metal framework of this cluster can be described as a fragment of a body-centered cubic (bcc) lattice with the silver and gold atoms occupying the vertices and the body center of the cube, respectively. The incorporation of alkali metal atoms gave rise to [MnAg8− nAu7(C≡CtBu)12]+ clusters ( n=1 for M=Na, K, Rb, Cs and n=2 for M=K, Rb), with the alkali metal ion(s) presumably occupying the vertex site(s), whereas the incorporation of copper atoms produced [CunAg8Au7− n(C≡CtBu)12]+ clusters ( n=1-6), with the Cu atom(s) presumably occupying the capping site(s). The parent cluster exhibited strong emission in the near-IR region ( λmax=818 nm) with a quantum yield of 2 % upon excitation at λ=482 nm. Its photoluminescence was quenched upon substitution with a Na+ ion. DFT calculations confirmed the superatom characteristics of the title compound and the sodium-substituted derivatives. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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