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Composite Icosahedron/Cube Endohedral Clusters in Rh2Cd15
Weiwei Xie1, Minhao Liu2, Zhijun Wang2
1Department of Chemistry, Princeton University , Princeton, New Jersey 08540, United States.
Researchers discovered Rh2Cd15, a novel binary compound featuring unique transition-metal-embedded cadmium clusters. Its stability is linked to electron counts near a specific electronic density of states pseudogap.
Area of Science:
- Solid-state chemistry
- Inorganic materials science
- Crystallography
Background:
- The Rh-Cd binary system was previously unexplored.
- Understanding intermetallic compound formation requires detailed structural and electronic analysis.
Purpose of the Study:
- To report the synthesis and characterization of the first binary compound in the Rh-Cd system.
- To elucidate the structural features and stability factors of the new compound, Rh2Cd15.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Analysis of atomic interactions and electron counting principles.
- First-principles electronic structure calculations.
Main Results:
- Identification of Rh2Cd15, featuring transition-metal-embedded endohedral Cd clusters (Rh@Cd11 and Rh@Cd12).
- Demonstration of structural relationships between these clusters.
- Postulation of 50 electrons per formula unit as a critical electron count for bonding/antibonding interactions.
Conclusions:
- The stability of Rh2Cd15 is strongly influenced by its electron count (48 electrons per formula unit) residing near a deep pseudogap in the electronic density of states.
- This finding provides insight into the factors governing the formation and stability of complex intermetallic compounds.
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