Carbon-Free Fullerenes: Condensed and Stuffed Anionic Examples in Indium Systems
- 5 November 1993
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 262 (5135) , 880-883
- https://doi.org/10.1126/science.262.5135.880
Abstract
Condensed, well-ordered analogs of the fullerenes occur in the hexagonal phases Na96In97Z2 (Z = nickel, palladium, or platinum). Large cages of In74 (D3h) and M60 (= In48Na12, D3d) share pentagonal faces to generate a double—hexagonal close-packed analog of NiAs. All these polyhedra are centered by partially disordered In10Z clusters within deltahedra of sodium atoms that cap all inner faces of the cages, namely, Z@In10@Na39@In74 and Z@In10@Na32@Na12In48 "onions" The highest filled bands in these compounds apparently involve localized electron pairs on surface features on In74-based layers. Structural and electronic relations between diamond and Naln (stuffed diamond structure) parallel those between certain fullerenes and Na96In97Z2 and, presumably, other valence-driven intermetallic phases.Keywords
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