ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Gd10C4Cl18 and Gd10C4Cl17, Two Lanthanoid Cluster Compounds with Interstitial C2 UnitsThe compounds Gd10C4Cl18 (I) and Gd10C4Cl17 (II) are prepared by heating stoichiometric amounts of GdCl3, Gd, and graphite in sealed tantalum tubes at 1070 (I) and 1 120 K (II). Single crystal investigations (I: P21/c, Z = 2, a = 918.2, b = 1 612.0, c = 1 288.6 pm, β = 119.86°; II: P1, Z = 1, a = 849.8, b = 917.4, c = 1 146.2 pm, α = 104.56°, β = 95.98°, γ = 111.35°) revealed the occurrence of novel Gd10C4Cl18 clusters. The metal framework is formed by edge-sharing of two Gd6 octahedra. These are centred by C2 units (dC—C = 147 pm) and Cl atoms bridge all available edges of the octahedra. The structure of I corresponds to a packing of such quasi molecular clusters, in II they are linked to chains via common Cl atoms. Both structures are discussed in terms of a model of close packed spheres as well as in the concept of condensed clusters.
Notes:
Die Verbindungen Gd10C4Cl18 (I) und Gd10C4Cl17 (II) werden durch Erhitzen stöchiometrischer Gemenge von GdCl3, Gd und Graphit in verschweißten Tantalkapseln bei 1 070 (I) bzw. 1 120 K (II) dargestellt. Strukturuntersuchungen an Einkristallen (I: P21/c, Z = 2, a = 918,2, b = 1 612,0, c = 1 288,6 pm, β = 119,86°; II: P1, Z = 1, a = 849,8, b = 917,4, c = 1 146,2 pm, α = 104,56°, β = 95,98°, γ = 111,35°) ergeben das Vorliegen von neuartigen Gd10C4Cl18-Clustern. Das Metallgerüst wird von zwei kantenverknüpften Gd6-Oktaedern gebildet. Diese sind jeweils mit C2-Einheiten (dC—C = 147 pm) gefüllt und durch Cl-Atome vor allen freien Kanten umgeben. In der Struktur von I liegen diese Cluster quasi molekular vor; in II sind sie über gemeinsame Cl-Atome zu Ketten verknüpft. Beide Strukturen werden im Konzept dichtester Kugelpackungen sowie im Konzept kondensierter Cluster diskutiert.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19824910142
Permalink