Volume 60, Issue 20 pp. 11430-11435
Research Article

Chiral Superatomic Nanoclusters Ag47 Induced by the Ligation of Amino Acids

Wen-Di Liu

Wen-Di Liu

Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University, Beijing, 100084 P. R. China

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Jia-Qi Wang

Jia-Qi Wang

Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University, Beijing, 100084 P. R. China

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Shang-Fu Yuan

Shang-Fu Yuan

Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University, Beijing, 100084 P. R. China

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Dr. Xi Chen

Corresponding Author

Dr. Xi Chen

Department of Applied Physics, Aalto University, Otakaari 1, 02150 Espoo, Finland

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Prof. Dr. Quan-Ming Wang

Corresponding Author

Prof. Dr. Quan-Ming Wang

Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Tsinghua University, Beijing, 100084 P. R. China

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First published: 24 February 2021
Citations: 77

Graphical Abstract

Amino acids protected silver nanoclusters with Ag0 atoms [Ag47L12(C≡CtBu)16]BF4 (L=l-/d- valine or l-/d- isoleucine) have been synthesized for the first time. The Ag47 kernel consists of a tetracapped truncated tetrahedron (Ag17) and six W-shaped Ag5 units. They are superatoms with 1S21P61D10 configuration as revealed by DFT calculations. This work offers a facile method to obtain chiral nanoclusters by incorporating amino acids.

Abstract

Silver nanoclusters containing Ag0 atoms protected by amino acids were synthesized and characterized. Chiral superatomic silver nanoclusters [Ag47L12(C≡CtBu)16]BF4 (L=l-/d-valine or l-/d-isoleucine) have been prepared by reducing AgC≡CtBu and amino acids (AAs) with NaBH4. Single crystal X-ray diffraction revealed that these clusters have T symmetry, and the Ag47 metal kernel can be viewed as a tetracapped truncated tetrahedron (Ag17) surrounded with six W-shaped Ag5 units. The clusters are homochiral as evidenced by CD measurements. As for the strong CD signals, large contributions are found from the occupied Ag s,p states (superatomic D states) near the Fermi level. Electron counting revealed that these clusters are 18-electron systems, suggesting they are superatomic clusters. The superatomic nature with a 1S21P61D10 configuration was supported by DFT calculations. This work paves the way of taking AAs as facile chiral induction agents for the synthesis of metal nanoclusters.

Conflict of interest

The authors declare no conflict of interest.

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