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- Title
Alkynyl‐Protected Chiral Bimetallic Ag<sub>22</sub>Cu<sub>7</sub> Superatom with Multiple Chirality Origins.
- Authors
Deng, Guocheng; Lee, Kangjae; Deng, Hongwen; Malola, Sami; Bootharaju, Megalamane S.; Häkkinen, Hannu; Zheng, Nanfeng; Hyeon, Taeghwan
- Abstract
Understanding the origin of chirality in the nanostructured materials is essential for chiroptical and catalytic applications. Here we report a chiral AgCu superatomic cluster, [Ag22Cu7(C≡CR)16(PPh3)5Cl6](PPh4), Ag22Cu7, protected by an achiral alkynyl ligand (HC≡CR: 3,5‐bis(trifluoromethyl)phenylacetylene). Its crystal structure comprises a rare interpenetrating biicosahedral Ag17Cu2 core, which is stabilized by four different types of motifs: one Cu(C≡CR)2, four −C≡CR, two chlorides and one helical Ag5Cu4(C≡CR)10(PPh3)5Cl4. Structural analysis reveals that Ag22Cu7 exhibits multiple chirality origins, including the metal core, the metal‐ligand interface and the ligand layer. Furthermore, the circular dichroism spectra of R/S‐Ag22Cu7 are obtained by employing appropriate chiral molecules as optical enrichment agents. DFT calculations show that Ag22Cu7 is an eight‐electron superatom, confirm that the cluster is chirally active, and help to analyze the origins of the circular dichroism.
- Subjects
CIRCULAR dichroism; NANOSTRUCTURED materials; COPPER; CRYSTAL structure; ETHYNYL benzene
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 12, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202217483