Synthesis, characterization, and bonding of indium clusters: A[sub 3]Na[sub 26]In[sub 48] (A = K, Rb, Cs) with a novel cubic network of arachno- and closo-In[sub 12] clusters
- Ames Lab., IA (United States)
The title compounds are obtained in high yield by slow cooling of the appropriate fused mixture of elements in welded Ta. They occur in the cubic space group Pm[bar 3]n, Z = 2, with a = 16.0640(4), 16.101(1), 16.130(1) [Angstrom] for A = K, Rb, Cs, respectively. The structure was refined by single-crystal means for A = K, Rb to R, R[sub w] = 2.5, 3.3 and 2.0, 2.5%. The structure contains closo-In[sub 12] icosahedra (T[sub h] symmetry) plus arachno-In[sub 12] (D[sub 2d]) as approximate (D[sub 6d]) hexagonal antiprisms (drums) with 12 exo In-In bonds about each cluster. Nonintersecting chains of [open quotes]drums[close quotes] lie in the faces of the cubic cell and parallel to the cell edges. Adjacent arachno clusters are interconnected only indirectly at chain crossings via the closo polyhedra that define a body-centered cube. The structure is A15 (Cr[sub 3]-Si)-like with arachno- and closo-In[sub 12] clusters, respectively, replacing the metal and non-metal atoms of the parent. The larger A cations order in, and appear required for, the larger cavities lying between drums in each chain. The compounds are electron-rich by 5.5% according to theory, and the potassium example is metallic ([rho][sub 295] [approximately] 23 [mu][Omega] cm) and Pauli paramagnetic (2.2 [times] 10[sup [minus]3] emu mol[sup [minus]1]) by measurement. 23 refs., 2 figs., 3 tabs.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6299062
- Journal Information:
- Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 32:9; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ATOMIC CLUSTERS
BONDING
CAVITIES
CESIUM COMPOUNDS
CHAINS
CHARGED PARTICLES
CHEMICAL REACTION YIELD
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
INDIUM COMPOUNDS
IONS
JOINING
LATTICE PARAMETERS
MOLECULAR STRUCTURE
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
RUBIDIUM COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
SYMMETRY
SYNTHESIS
X-RAY DIFFRACTION
YIELDS