L. El Ammari

Silver trimagnesium phosphate bis­(hydrogenphosphate), AgMg3(PO4)(HPO4)2, with an alluaudite-like structure

The title compound, AgMg3(PO4)(HPO4)2, which has been synthesized by the hydrothermal method, has an alluaudite-like structure which is formed by edge-sharing MgO6 octahedra (one of which has symmetry 2), resulting in chains linked together by phosphate groups and hydrogen bonds. The three-dimensional framework leads to two different channels along the c axis, one of which is occupied by Ag+ ions with a square-planar coordination. The Ag+ ions are disordered over two sites in a 0.89 (3):0.11 (3) ratio. The OH groups, which point into the other type of channel, are involved in strong O—H⋯O hydrogen bonds. The title compound is isotypic with the compounds AM 3H2(XO4)(HXO4)2 (A = Na or Ag, M = Mn, Co or Ni, and X = P or As) of the alluaudite structure type.

catena-Poly[heptyl­enedi­ammonium [[tetra­chloridobismuthate(III)]-μ-chlorido]]

The title organic-inorganic hybrid compound, {(C7H20N2)[BiCl5]}n, consists of distorted corner-joined [BiCl6] octahedra forming zigzag polymeric anionic chains parallel to [001], separated by columns of heptylenediammonium cations. The asymmetric unit contains two crystallographically independent bismuth metal atoms, one of which lies on an inversion centre and the other on a twofold axis. In the crystal, the polymeric chains and cations are linked by N—H⋯Cl hydrogen bonds, forming undulating layers parallel to (110).

(1S,3R,8R,9S,11R)-2,2,10,10-Tetra­chloro-3,7,7,11-tetra­methyl­tetra­cyclo­[6.5.0.01,3.09,11]trideca­ne

The title compound, C17H26Cl2, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent molecules with similar conformations. Each molecule is built up from fused six- and seven-membered rings and two three-membered rings from the reaction of β-himachalene with dichlorocarbene. In both molecules, the six-membered ring has a half-chair conformation, whereas the seven-membered ring displays a boat conformation. The absolute configuration was established from anomalous dispersion effects.

Crystal structure of 1-isopropyl-4,7-dimethyl-3-nitro­naphthalene

The title compound, C15H17NO2, was synthesized from a mixture of α-himachalene (2-methylene-6,6,9-trimethylbicyclo[5.4.01,7]undec-8-ene) and β-himachalene (2,6,6,9-tetramethylbicyclo[5.4.01,7]undeca-1,8-diene), which were isolated from an oil of the Atlas cedar (Cedrus Atlantica). The naphthalene ring system makes dihedral angles of 68.6 (2) and 44.3 (2)°, respectively, with its attached isopropyl C/C/C plane and the nitro group. In the crystal, molecules held together by a C—H⋯O interaction, forming a chain along [-101].

BaMnII2MnIII(PO4)3

The title compound, barium trimanganese tris(orthophosphate), was synthesized hydrothermally. Its structure is isotypic with the lead and strontium analogues AMnII 2MnIII(PO4)3 (A = Pb, Sr). Except for two O atoms on general positions, all atoms are located on special positions. The Ba and one P atom exhibit mm2 symmetry, the MnII atom 2/m symmetry, the MnIII atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The crystal structure contains two types of chains running parallel to [010]. One chain is linear and is composed of alternating MnIIIO6 octahedra and PO4 tetrahedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing MnIIO6 octahedra connected to PO4 tetrahedra by edges and vertices. The two types of chains are linked through PO4 tetrahedra into an open three-dimensional framework which contains channels parallel to [100] and [010] in which the BaII ions are located. The alkaline earth cation is surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.

Crystal structure of alluaudite-type NaMg3(HPO4)2(PO4).

NaMg3(PO4)(HPO4)2 crystallizes in the alluaudite-type structure. Two types of [MgO6] octahedra, one [NaO10] polyhedron, one orthophosphate and one hydrogenphosphate tetrahedron form the structural set-up.

SrMnII2MnIII(PO4)3

The title compound, strontium trimanganese tris(orthophosphate), was synthesized under hydrothermal conditions. Its structure is isotypic to that of the lead analogue PbMnII 2MnIII(PO4)3. Two O atoms are in general positions, whereas all others atoms are in special positions. The Sr and one P atom exhibit mm2 symmetry, the MnII atom 2/m symmetry, the MnIII atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The three-dimensional network of the crystal structure is made up of two types of chains running parallel to [010]. One chain is linear and is composed of alternating MnIIIO6 octahedra and PO4 tetrahedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing MnIIO6 octahedra connected to PO4 tetrahedra by edges and vertices. The two types of chains are linked through PO4 tetrahedra, leading to the formation of channels parallel to [100] and [010] in which the SrII ions are located. They are surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.

Crystal structure of N′-di­phenyl­methyl­idene-5-methyl-1H-pyrazole-3-carbo­hydrazide

In the title compound, C18H16N4O, the planes of the phenyl rings are approximately perpendicular to each other [dihedral angle = 78.07 (8)°] and form dihedral angles of 56.43 (8) and 24.59 (8)° with the pyrazole ring. In the crystal, molecules are linked by N—H⋯O hydrogen bonds to form one-dimensional chains parallel to the [010] direction.

(2Z)-2-Benzyl-idene-4-(prop-2-yn-1-yl)-2H-1,4-benzo-thia-zin-3(4H)-one.

The molecule of the title compound, C18H13NOS, is build up from two fused six-membered rings, with the heterocyclic component linked to a benzylidene group and to a prop-2-yn-1-yl chain. The six-membered heterocycle adopts a distorted screw-boat conformation. The prop-2-yn-1-yl chain is almost perpendicular to the mean plane through benzothiazine as indicated by the C—N—C—C torsion angle of 86.5 (2)°. The dihedral angle between the benzene rings is 47.53 (12)°. There are no specific intermolecular interactions in the crystal packing.

Dicobalt(II) lead(II) hydrogenphos­phate(V) phos­phate(V) hydroxide monohydrate

The title compound, Co2Pb(HPO4)(PO4)OH·H2O, which was synthesized under hydrothermal conditions, crystallizes in a new structure type. Except for two O atoms in general positions and two Co atoms on centres of symmetry, all other atoms in the asymmetric unit (1 Pb, 2 Co, 2 P, 8 O and 4 H) are located on mirror planes. The structure is built up from two infinite linear chains, viz. 1 ∞[CoO2/1(H2O)2/2O2/2] and 1 ∞[CoO2/1(OH)2/2O2/2], of edge-sharing CoO6 octahedra running along [010]. Adjacent chains are linked to each other through PO4 and PO3(OH) tetrahedra, leading to the formation of layers parallel to (100). The three-dimensional framework is formed by stacking along [100] of adjacent layers that are held together by distorted PbO8 polyhedra. Hydrogen bonds of the type O—H⋯O involving the water molecule are very strong, while those O atoms involving the OH groups form weak bifurcated and trifurcated hydrogen bonds.