Na₁₄Ba₁₄CaN₆ – ein nanodisperses System von Salz in Metall

Abstract

ZUSCHRIFTENbleibt. Fur eine isomere Anordnung 5 rnit der fur dimere Diorganogalliumchloride ublichen doppelten Chlorverbruckung wlren nach einfachen MM + -Kraftfeldrechnungen kurze (kleiner als 300 pm) C1-Cl-Abstande zwischen den parallelen, nichtplanaren Ga,CI,-Ringen sowie eine hohe Ringspannung zu erwarten.Das Dichlorbis(hypersi1yl)digallan eroffnet vielfaltige Moglichkeiten der Synthese neuer Gallium(I1)-Verbindungen, insbesondere von Heterocyclen mit einer Ga,-Einheit. Experimentelles

Preparation and Crystal Structure of Na7Ba14CaN6: A New Subnitride in the NaxBa14CaN6 Series

“…This specific type of cluster is a condensate of six face-sharing Ba 5 CaN octahedra, as described earlier. [2,3] While in the case of Na 8 Ba 14 CaN 6 these clusters stack on top of each other (Figure 2), rhombohedral stacking, a distorted variant of ccp arrangement, is observed in Na 7 Ba 14 CaN 6 ( Figure 1); because of this, the sodium chains filling the available channels between the clusters in Na 8 Ba 14 CaN 6 are interrupted with a formal loss of one sodium atom per cluster. The sodium atoms in Na 7 Ba 14 CaN 6 can be viewed as clustered in Na 7 units (Figure 3), although this viewpoint is purely [ formal.…”

“…The product is Na 14 Ba 14 CaN 6 (the observed reflections matched the expected pattern of the cubic structure with a ϭ 17.895 Å as reported in ref. [2] ) with about 10 wt.% of a NaBa 3 N impurity (hexagonal with a ϭ 8.4414 Å and c ϭ 6.9817 Å [5] ) according to X-ray diffraction. NaBa was prepared as described in ref.…”

“…This compound joined the family of the previously known Na 14 Ba 14 CaN 6 , [2,3] Na 17 Ba 14 CaN 6 , [3] Na 21 Ba 14 CaN 6 , [3] and Na 22 Ba 14 CaN 6 . [3,4] All of these compounds feature Ba 14 CaN 6 clusters, which are bonded ionically in their interior and bonded metallically to Na atoms between the clusters.…”

Li26 Clusters in the Compound Li13Na29Ba19

“…In this cluster, a central Li 4 tetrahedron is capped by 4, 6, and 4 3 Li atoms above its faces, edges, and vertices, respectively. Such anti-Mackay-type [9,10] Li 26 clusters have been predicted to be stable in the gas phase, [11] and isostructural Ar 26 [12] and Ba 26 [13] species have been postulated on the basis of cluster distributions in mass spectra of the gaseous elements. In the solid state, the M 26 cluster of g-brass (Cu 5 Zn 8 ) is well known, [14] but is composed of different atom types.…”

“…[8] The main structural feature of this compound is a Li 26 cluster formed from four interpenetrating icosahedra (Figure 1). In this cluster, a central Li 4 tetrahedron is capped by 4, 6, and 4 3 Li atoms above its faces, edges, and vertices, respectively.…”