Gd10C4Cl18 und Gd10C4Cl17, zwei Seltenerdmetall-Clusterverbindungen mit interstitiellen C2-Gruppen |
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Authors: | E Warkentin R Masse A Simon |
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Abstract: | Gd10C4Cl18 and Gd10C4Cl17, Two Lanthanoid Cluster Compounds with Interstitial C2 Units The 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. |
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