Chiral Superatomic Nanoclusters Ag47 Induced by the Ligation of Amino Acids. (7th April 2021)

• Record Type: Journal Article
• Authors: Liu, Wen‐Di; Wang, Jia‐Qi; Yuan, Shang‐Fu; Chen, Xi; Wang, Quan‐Ming
• Is Part Of: Angewandte Chemie. Volume 133:Number 20(2021)
• Page Start: 11531
• Page End: 11536
• Publication Date: 2021-04-07
• Subjects: amino acids -- chirality -- cluster compounds -- silver -- superatoms; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202100972
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Silver nanoclusters containing Ag 0 atoms protected by amino acids were synthesized and characterized. Chiral superatomic silver nanoclusters [Ag47 L12 (C≡C t Bu)16 ]BF4 (L=l‐/d ‐valine or l‐/d ‐isoleucine) have been prepared by reducing AgC≡C t Bu 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 1S 2 1P 6 1D 10 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. Abstract : Amino acids protected silver nanoclusters with Ag 0 atoms [Ag47 L12 (C≡C t Bu)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 1S 2 1P 6 1D 10 configuration as revealed by DFT calculations. This work offers a facile method to obtain chiral nanoclusters by incorporating amino acids.