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
Four crystalline subnitrides have been isolated by reacting Ba, (Sr), Ca in Na or NaK alloy with nitrogen from different sources. According to single crystal X-ray structure analyses these phases have compositions Na,Ba,,CaN, (n = 14, 17, 21 and 22), and they contain the new Bal,CaN6 cluster, which consists of six face-sharing Ba,CaN octahedra with Ca in the centre of the cluster. This ion cluster is inserted into different metallic substructures formed by the Na atoms. Na,,Ba,,CaN, exhibits a characteristic disorder which is due to frustration effects and is closely related to the disorder of an antiferromagnetic Ising spin system in a two-dimensional triangular lattice.
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