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127 citations found for Weil, M
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Pb6Co9(TeO6)5, hexalead(II) nonacobalt(II) pentatellurate(VI), is isotypic with its nickel(II) analogue. The asymmetric unit contains two Pb atoms (site symmetries .2., ..2), four Co atoms (..2, ..2, 3.., 3.2) two Te atoms (..2, 3..) and six O atoms (all in general positions), with the Te and Co sites in octahedral coordination environments. The crystal structure can be subdivided into two types of layers parallel to (001). The first layer at z ≃ 0.25 is made up of edge-sharing [CoO6] and [TeO6] octahedra, with 1/6 of the octahedral holes not occupied. The second layer, situated at z ≃ 0, consist of an alternating arrangement of PbII atoms and of double octahedra that are made up from face-sharing [CoO6] and [TeO6] octahedra. The two types of layers are linked together through corner-sharing of [CoO6] and [TeO6] octahedra. The PbII atoms are situated in the cavities of the framework and are stereochemically active with one-sided [4]- and [6]-coordinations, respectively.
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In the structure of PbCa2[Al8O15], AlO4 tetrahedra and AlO5 trigonal bipyramids in a 3:1 ratio constitute the framework [Al8O15]6- aluminate anion through corner- and edge-sharing. Pb2+ and Ca2+ cations exhibit coordination numbers of 7 and 6, respectively.
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Na2(Fe2/3Te4/3)O6 was obtained under hydrothermal conditions and adopts the ilmenite (FeTiO3) structure type.
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The crystal structure of Ni3Te2O2(PO4)2(OH)4 comprises a comparatively rare penta-coordinated TeIV atom, resulting in a [TeO3(OH)2] square-pyramidal coordination polyhedron.
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The crystal structure of a new polymorph of CdTe2O5, designated as the β-form, contains 2∞[Te2O5]2– (100) layers with an undulating shape.
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The crystal structure of the title compound consists of 2∞[Ni3As2(OH)6/3O18/3O1/1(OH)1/1] layers extending parallel to (001) and exhibits disorder of the (O/OH) units of the (hydrogen)arsenate anion; the ammonium counter-cations are sandwiched between adjacent layers.
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The crystal structure of Zn2(HTeO3)(AsO4) consists of ∞2[ZnO3/2(OH)1/2O1/1] layers extending parallel to (001) that are linked by [TeIVO3OH] and oxidoarsenate(V) groups.
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The garnet-type crystal structure of Na3Te2(FeO4)3 shows high similarities with its isotypic analogues Na3Te2[(Fe0.5Al0.5)O4]3 and Na3Te2(GaO4)3.
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The crystal structure of the title compound comprises a tetracarbonatozincate(II) anion, [Zn(CO3)4]6−, with point-group symmetry 2 where the ZnII atom is surrounded in a distorted tetrahedral manner by four monodentate carbonate groups.
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Cd2(PO4)OH and Cd5(PO4)2(OH)4 crystallize in the mineral structures of triplite and arsenoclasite, respectively.
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The melaminium (2,4,6-triamino-1,3,5-triazin-1-ium) cation in the title compound, C3H7N6+·C3H3O4−, is essentially planar, with a r.m.s. deviation of the non-H atoms of 0.0085 Å. Extensive hydrogen bonding of the types N—H
N and N—H
O between cations and cations and between cations and hydrogen malonate (2-carboxyethanoate) anions leads to the formation of supramolecular layers parallel to (1-2-1). An intramolecular O—H
O hydrogen bond in the single deprotonated malonate anion also occurs.
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The asymmetric unit of the solvated title salt, 2C3H7N6+·C4H4O42−·C4H6O4·2H2O, contains one essentially planar melaminium (2,4,6-triamino-1,3,5-triazin-1-ium) cation (r.m.s. deviation of the non-H atoms = 0.0097 Å), one-half of a succinate anion, one-half of a succinic acid solvent molecule and one water molecule of crystallization; full molecules are generated by inversion symmetry. Supramolecular layers parallel to (12-1) are formed through extensive intermolecular hydrogen bonding of the types O—H
O, N—H
N and N—H
O between the components.
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The dinuclear title molecular complex is centrosymmetric, with the VIV atom in a distorted square-pyramidal coordination environment.
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The title salt consists of isolated octahedrally shaped [Mn(DMSO)6]2+ cations (DMSO is dimethyl sulfoxide) and two I− anions, held together through weak C—H
I interactions.
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2,5-Diazido-1,4-phenylene diacetate and dibutyrate are the first structurally characterized representatives with a trans-diazidophenylene entity. Both molecules possess inversion symmetry; however, the compounds crystallize in different crystal systems (triclinic versus monoclinic).
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Crystal structure of trans-1,4-bis[(trimethylsilyl)oxy]cyclohexa-2,5-diene-1,4-dicarbonitrile
The molecular structure of the title compound is centrosymmetric. The cyclohexa-2,5-diene moiety is exactly planar and has a bond-length distribution characteristic for one pair of double bonds and two pairs of single bonds.
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KAgCO3 is polytypic and crystallizes as allotwins (oriented associations of non-equivalent polytypes) with highly ordered domains.
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