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Carbon-free fullerenes: condensed and stuffed anionic examples in indium systems
Science (New York, N.Y.)
|November 5, 1993
Summary
New hexagonal phases, Na(96)In(97)Z(2), exhibit fullerene-like structures with unique cage arrangements. These intermetallic compounds show potential for novel electronic properties due to localized electron pairs.
Area of Science:
- Solid-state chemistry
- Materials science
- Crystallography
Background:
- Fullerenes are carbon molecules with unique cage structures.
- Intermetallic compounds offer diverse structural and electronic properties.
- Understanding complex inorganic structures is key to discovering new materials.
Purpose of the Study:
- To investigate the structure and properties of hexagonal phases Na(96)In(97)Z(2).
- To explore the relationship between these structures and fullerene analogs.
- To understand the electronic behavior of these novel compounds.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Electronic band structure calculations to analyze conductivity.
- Comparative analysis with known fullerene and intermetallic structures.
Main Results:
- Discovery of hexagonal phases Na(96)In(97)Z(2) (Z = Ni, Pd, Pt) with ordered, fullerene-like cages.
- Identification of large In(74) and M(60) polyhedra sharing pentagonal faces, forming a NiAs analog.
- Observation of Z@In(10)@Na clusters within sodium-capped cages, resembling "onions".
Conclusions:
- The hexagonal phases represent condensed, well-ordered analogs of fullerenes.
- Electronic properties likely arise from localized electron pairs on In(74)-based layers.
- Structural and electronic parallels exist between diamond, NaIn, fullerenes, and Na(96)In(97)Z(2).
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