Synthesen, Kristallstrukturen und Drillingsbildung der Cluster-Trimere Bi2[PtBi6Br12]3 und Bi2[PtBi6I12]3†
作者： Anja Günther , Folker Steden , Michael Ruck
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摘要: Syntheses, Crystal Structures, and Triple Twinning of the Cluster Trimers Bi2[PtBi6Br12]3 Bi2[PtBi6I12]3 Melting reactions Bi with Pt BiX3 (X = Br, I) yield shiny black, air insensitive crystals subhalides Bi2[PtBi6X12]. crystallizes in monoclinic space group C2/m lattice parameters a 1617.6(2) pm, b 1488.5(1) c 1752.4(2) β 110.85(4)°. Bi2[PtBi6I12]3 adopts triclinic pseudo-monoclinic 1711.2(2) 1585.1(1) 1865.7(2) α 90°, 111.15(4)°, γ 90°. The two homoeotypic compounds consist cuboctahedral [Pt−IIBiII6X−I12]2− clusters that are concatenated into linear trimers by BiIII atoms. ordered distribution atoms destroys inherent threefold rotation axes packing cluster anions. As consequence pseudosymmetry triple twinned along [201]. Due to different orientations there BiII···X inter-cluster bridges per BiII atom but only one bridge Bi2[PtBi6I12]3. structure iodine compound can be deduced from NaCl type, leaving 37 96 atomic positions unoccupied. arrangement follows motif body-centered cubic packing.
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