Habib Boughzala

Structure de RbAlAs2O7

Rubidium aluminium pyroarsenate, M r =374.29, triclinic, PI, a=8.233 (5), b=6.34 (2), c=6.241 (5) A, α=102.6 (1), β=103.89 (7), γ=96.7 (1) o , V=303.9 A 3 , Z=2, D m =3.9 (3) (pycnometry), D x =4.09 g cm -3 , λ(Ag Kα)=0.5608 A, μ=108.14 cm -1 , F(000)=344, T=296 K, R=0.049, wR=0.053 for 2193 reflections. The first structural investigation on a pyroarsenate is reported

trans-Dichlorido(1,4,8,11-tetra­azacyclo­tetra­deca­ne)manganese(III) tetra­fluorido­borate

In the title manganese(III) complex, [MnCl2(C10H24N4)]BF4 or trans-[MnCl2(cyclam)]BF4 (cyclam is the tetradentate amine ligand 1,4,8,11-tetraazacyclotetradecane), the MnIII ions occupy the center of a distorted octahedron coordinated by all four ligand nitrogen donors in the macrobicyclic cavity and two chloride ions occupy the axial positions. Intramolecular hydrogen bonding involving the coordinated chloride ions and the hydrogen atoms of the cyclam ligand is observed. Intermolecular hydrogen bonding involving the tetrafluoridoborate anion and hydrogen atoms of the cyclam ligand leads to an infinite one-dimensional chain along the a axis. The tetrafluoridoborate and inorganic units are linked by N—H⋯F hydrogen bonds. The structure may be compared with those of analogous compounds [MnCl2(cyclam)]ClO4 and [Mn(CN)2(cyclam)]ClO4.

Tris(2,2'-bipyridine)iron(II) bis(1,1,3,3-tetracyano-2-ethoxypropenide) dihydrate : chiral hydrogen-bonded frameworks interpenetrate in three dimensions

In the title compound, [Fe(C10H8N2)3](C9H5N4O)2·2H2O, the chiral cations lie across twofold rotation axes in the space group C2/c. The anions and the water molecules are linked by two independent O-H···N hydrogen bonds to form C2(2)(8) chains, and these chains are linked by the cations via C-H···N and C-H···O hydrogen bonds to form two interpenetrating three-dimensional frameworks, each of which contains only one enantiomeric form of the chiral cation.

Crystal structures of 2,2′-bipyridin-1-ium 1,1,3,3-tetracyano-2-ethoxyprop-2-en-1-ide and bis(2,2′-bipyridin-1-ium) 1,1,3,3-tetracyano-2-(dicyanomethylene)propane-1,3-diide

In each of the title compounds, the anion shows evidence of extensive electronic delocalization. A combination of N—H⋯N and X—H⋯N hydrogen bonds links the ions in (I) into a ribbon of alternating centrosymmetric (18) and (26) rings, and those in (II) into simple (7) chains of alternating cations and anion with further cations pendent from the chain.

Bis(1,4-diazo­niabi­cyclo­[2.2.2]octa­ne) di-μ-chlorido-bis­[tetra­chlorido­anti­monate(III)] dihydrate

The title salt, (C6H14N2)2[Sb2Cl10]·2H2O, was obtained by slow evaporation of an acidic solution of 1,4-diazabicyclo[2.2.2]octane and SbCl3. The crystal structure consists of (C6H14N2)2+ cations, [Sb2Cl10]4− double octahedra and lattice water molecules. All molecular components are situated on special positions. The cation and the lattice water molecule exhibit mirror symmetry, whereas the anion has site symmetry 2/m. The cations, anions and water molecules are alternately arranged into columns along [010]. Individual columns are joined into layers extending along (001). Intralayer N—H⋯O and interlayer N—H⋯Cl hydrogen-bonding interactions lead to the formation of a three-dimensional network.

Poly[bis-(1-carbamoylguanidinium) [tri-μ-chlorido-dichloridobismuthate(III)]].

The structure of the title organic–inorganic hybrid compound, {(C2H7N4O)2[BiCl5]}n, consists of corrugated chains parallel to [100] of corner-joined [BiCl6] octahedra, separated by layers of organic 1-carbamoylguanidinum cations. The crystal cohesion is achieved by N—H⋯O and N—H⋯Cl hydrogen bonds, which link the organic and inorganic parts of the structure.

4-Sulfamoylanilinium chloride

In the crystal structure of the title compound, C6H9N2O2S+·Cl−, the chloride anions are sandwiched between layers of 4-sulfonamidoanilinium anions. The components interact by way of N—H⋯Cl and N—H⋯O hydrogen bonds, building up a three-dimensional network.

Na5Bi2(AsO4)(As2O7)2

Pentasodium dibismuth arsenate bis(diarsenate) has been synthesized by solid-state reaction and characterized by single-crystal X-ray diffraction. The structure is a three-dimensional framework comprising distorded BiO6 octahedra, As2O7 groups and AsO4 tetrahadra sharing corners. Along the c axis, the structure exhibits large tunnels where Na+ cations are located.

1-(4-Hy-droxy-phen-yl)piperazine-1,4-diium tetra-chlorido-cobalt(II) monohydrate.

The asymmetric unit of the title inorganic–organic hybrid compound, (C10H16N2O)[CoCl4]·H2O, consists of a tetrahedral [CoCl4]2− anion, together with a [C10H18N2O]2+ cation and a water molecule. Crystal cohesion is achieved through N—H⋯Cl, O—H⋯Cl and N—H⋯O hydrogen bonds between organic cations, inorganic anions and the water molecules, building up a three-dimensional network.

K3Al2As1,92P1,08O12

The title compound, tripotassium dialuminium arsenic–phosphorus (1,92/1,08) dodecaoxide, has been synthesized by solid-state reaction and characterized by single-crystal X-ray diffraction. The structure is a three-dimensional framework comprising corner-sharing tetrahedra. Six-, eight- and twelve-membered rings are formed. An analogy with the nasicon structure has been ruled out despite similarities in the formulae. The structure is compared to MIMIIXO4 compounds and tridymite.