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Parts. -Yellow-green single crystals of the new compound Cu20Sb35O44Cl37 are synthesized from a mixture of SiO2, Sb2O3, and CuCl in 1:1:1 molar ratio (500°C, 93 h). As revealed by single crystal XRD the compound crystallizes in the tetragonal space group I4/mmm with Z = 2. The crystal structure consists of edge-sharing [Cu10Cl16] 6-T3 supertetrahedra that form infinite chains, and isolated, octahedral [Sb 35 Cl 5 O 44 ] 12+ clusters with pseudo-cubic symmetry. The anionic part and the covalent [Sb35Cl5O44] 12+ units are separated by an interface of the Sb III lone pairs, which generate a nonbonding shell surrounding the large clusters. -(MAYEROVA, Z.; JOHNSSON*, M.; LIDIN, S.; Angew. Chem., Int. Ed. 45 (2006) 34, 5602-5606; Dep. Inorg. Chem., Arrhenius Lab., Univ. Stockholm, S-106 91 Stockholm, Swed.; Eng.) -W. Pewestorf 46-008

In connection with crystal chemical studies of alkaline earth arsenates, BaZn 2 (AsO 4) 2 •H 2 O was synthesized under hydrothermal conditions. Its crystal structure was investigated by single-crystal Xray diffraction data from a merohedral twin. BaZn 2 (AsO 4) 2 •H 2 O crystallizes in space group P2 1 : a = 5.291(1), b = 10.418(2), c = 8.055(2) Å, = 95.33(3)°, Z = 2. The feldspar-like framework consists of ZnO 4 and AsO 4 tetrahedra which share corners. The central atoms Zn and As are arranged alternatingly, thus all O atoms of the framework are linked to a Zn and an As atom. The tetrahedra are connected to four-and eight-membered rings which are arranged to form channels in the direction of the a-axis. Parallel to these channels only the same kinds of tetrahedra are stacked above each other. Topologically related-but not identical-are e.g., paracelsian, BaAl 2 (SiO 4) 2 [1], danburite, CaB 2 (SiO 4) 2 [2], and BaZn 2 (AsO 4) 2 [3]. The [8]-coordinated Ba atom (BaO 8 forms a tetragonal antiprism) and the water molecules are located in cavities centred in the larger channels. The H 2 O molecule is linked to two Ba atoms; the acceptors of the hydrogen bonds are framework O atoms. Financial support of the Austrian science foundation (FWF) is gratefully acknowledged (Grant P15875-N03).

Structure Structure D 2000The Structure of Onoratoite, Sb 8 O 11 X 2 (X: Cl, Br) Revisited. -The crystal structure of Sb8O11Cl2 is revisited by single crystal XRD. The compound crystallizes in the triclinic space group P1 with Z = 4. The new structural model features exclusively atomic positions that are fully occupied and contains both [SbO4E] (E: 5s 2 lone pair of Sb) trigonal bipyramids and [SbO3E] tetrahedra. The isostructural compound Sb8O11Br2 is synthesized as well. -(MAYEROVA, Z.; JOHNSSON*, M.; LIDIN, S.; Solid State Sci. 8 (2006) 7, 849-854; Dep. Inorg. Chem., Arrhenius Lab., Univ. Stockholm, S-106 91 Stockholm, Swed.; Eng.) -W. Pewestorf 40-005