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inorganic compounds
The anionic component of the langbeinite-type title compound, ammonium oxonium dititanium(III,IV) tris(phosphate), is an infinite three-dimensional [Ti2(PO4)3]2− network based on PO4 tetrahedra corner-linked to TiO6 octahedra; the charge-balancing ammonium and oxonium cations occupy the cavities in the network and interact by way of N—H
O and O—HO hydrogen bonds. The two independent Ti atoms, the ammonium N atom and the oxonium O atom lie on special positions of site symmetry 3.
O and O—HO hydrogen bonds. The two independent Ti atoms, the ammonium N atom and the oxonium O atom lie on special positions of site symmetry 3.metal-organic compounds
The Zr atom in the title compound, {(C5H11N2)[Zr(C2O4)3]}n, is chelated by four oxalate groups in a square-antiprismatic geometry. Bridging by one of the three oxalate groups in the asymmetric unit gives rises to a helical tris(oxalato)zirconate chain that propagates along the b axis of the unit cell. The dications surround the chains and are tightly hydrogen bonded to them, resulting in a three-dimensional network.
metal-organic compounds
Ferric sulfate reacts with diethylenetriamine in the presence of acid under hydrothermal conditions to form the title compound, (C4H16N3)[Fe(SO4)3]·H2O. The six-coordinate ferrate trianion entity exists as a tri-μ2-sulfate-bridged chain that propagates along the c axis of the monoclinic unit cell. The trication and uncoordinated water molecule connect the polyanionic chain into a three-dimensional network structure.
metal-organic compounds
catena-Poly[hexamethylenediaminium [ferrate(III)-μ-hydroxo-κ2O:O-di-μ-sulfato-κ4O:O′] monohydrate]
Ferric sulfate reacts with 1,6-diaminohexane in the presence of acid under hydrothermal conditions to form the title compound, (C6H18N2)[Fe(OH)(SO4)2]·H2O. The six-coordinate ferrate trianion exists as a μ2-hydroxodi-μ2-sulfate-bridged chain that propagates along the b axis of the monoclinic unit cell. The dication and uncoordinated water molecule connect the polyanionic chain into a three-dimensional network structure. The asymmetric unit contains two Fe ions, each on a center of symmetry.
metal-organic compounds
In the crystal structure of the title compound, poly[[cobalt(II)-di-μ3-formato] dimethylformamide 0.33-solvate] [Co(CHO2)2]·0.33C3H7NO, the units of Co(HCO2)2 are assembled into a three-dimensional framework through carboxylate bridging. The four symmetry-independent Co atoms show nearly regular octahedral coordination; two of them lie on inversion centres.
organic compounds
The cations, anions and water molecules in the title compound, 2C4H16N33+·3SO42-·H2O, are linked by hydrogen bonds into a three-dimensional network structure. The water molecule and one sulfate anion lie on special positions of site symmetry 2; one of the sulfate anions is disordered.
organic compounds
The cation and anion in the title salt, C6H22N44+·2SO42-·H2O, lie on special positions of site symmetry m and the water molecule on a special position of site symmetry 2/m. The cations, anions and water molecules are linked by hydrogen bonds into a three-dimensional network.
metal-organic compounds
The reaction of ferric sulfate with ethylenediamine in the presence of acid under hydrothermal conditions results in the title compound, (C2H10N2)2[FeIII(OH)(SO4)2](SO4)·H2O. The six-coordinate ferrate dianion participates in a μ2-hydroxo-di-μ2-sulfate-bridged chain. The component species interact with each other by an extensive network of O—HO and N—HO hydrogen bonds. The two independent FeIII atoms lie on sites of 
symmetry.
O and N—HO hydrogen bonds. The two independent FeIII atoms lie on sites of 
symmetry.metal-organic compounds
The zirconium(IV) ion in the title compound, (C5H6N)4[Zr(SO4)4]·H2O, exists in a distorted dodecahedral geometry with four bidentate sulfate groups. The tetraanion, two of the pyridinium cations and water molecule all lie on special positions with m site symmetry. A network of N—HO and O—HO hydrogen bonds helps to stabilize the structure.
O and O—HO hydrogen bonds helps to stabilize the structure.metal-organic compounds
In the crystal structure of the title compound, (C10H10N2)[Fe(H2O)6](SO4)2·2H2O, hydrogen bonds link the 4,4'-bipyridinium cation, which lies on a special position of site symmetry 2, the hexaaquairon(II) cation, which lies on a center of symmetry, the sulfate anions and the uncoordinated water molecules into a three-dimensional network structure.
metal-organic compounds
In the crystal structure of the polymeric title compound, {(C4H12N2)[Fe(OH)(SO4)2]·2H2O}n, the anion exists as a linear chain whose two independent FeIII atoms both occupy special positions of 
site symmetry. The two independent cations, which also lie on inversion sites, interact with the polyanionic chain and with the uncoordinated water molecules to form a tight-held three-dimensional network.
site symmetry. The two independent cations, which also lie on inversion sites, interact with the polyanionic chain and with the uncoordinated water molecules to form a tight-held three-dimensional network.metal-organic compounds
In the title compound, (C4H16N3)[BiCl6], the BiIII atom is six-coordinate in a distorted octahedral geometry. The salt adopts a three-dimensional network arising from the hydrogen bonds between the cations and anions.
metal-organic compounds
In the title compound, (C5H14N2)2[Bi2Cl10]·2H2O, each BiIII atom of the centrosymmetric anion is six-coordinate in a distorted octahedral geometry. The salt adopts a three-dimensional network arising from the hydrogen bonds between the cations, anions and water molecules.
metal-organic compounds
In the title compound, (C2H8N)2[Ti(C7H4O3)3], the TiIV atom is chelated by three salicylate ligands in a mer-octahedral geometry. The cations and complex anions are linked by hydrogen bonds into a layer structure.
metal-organic compounds
In the title compound, (C4H12N2)[Ti(C7H4O3)3]·H2O·C3H7NO, the TiIV atom is chelated by three salicylate ligands in an octahedral geometry, the complex anion being the fac isomer. The cations, complex anions and solvent molecules are linked by hydrogen bonds into a layer structure.
metal-organic compounds
In the crystal structure of the title compound, {(C4H12N2)[Fe(OH)(SO4)2]·H2O}n, the anion exists as a linear chain that propagates in a zigzag manner along the c axis of the monoclinic unit cell. The organic cations, the polyanions and non-coordinated water molecules interact through O—HO and N—HO hydrogen bonds, forming a three-dimensional network.
O and N—HO hydrogen bonds, forming a three-dimensional network.metal-organic compounds
One acetate chelates to an Ni atom and the other bridges two Ni atoms in the title compound, catena-poly[[di-μ-acetato-1κO:2κO′-bis[(acetato-κ2O,O′)nickel(II)]]-di-μ-4,4′-bipyridine-1κN:1′κN′;2κN:2′κN′], [Ni2(C2H3O2)4(C10H8N2)2]n. The Ni atoms in the centrosymmetric [Ni2(C2H3O2)4] arrangement are bridged by the C10H8N2 ligands to afford a ribbon structure. The Ni atom, both acetates and the heterocyclic ligand all lie on special positions of m site symmetry.
metal-organic compounds
In the title compound, (C4H12N2)[Ti(C7H4O3)3]·C3H7NO, the TiIV ion is chelated by three bidentate salicylate ligands in an octahedral geometry. The arrangement of the hydroxyl O atoms about Ti corresponds to the fac geometrical isomer. The component species are linked by N—HO hydrogen bonds into a layered structure.
O hydrogen bonds into a layered structure.metal-organic compounds
The title compound, poly[μ3-formato-μ3-hydroxo-cobalt(II)], [Co(CHO2)(OH)]n, adopts a polymeric three-dimensional network structure arising from the μ3-bridging mode of both the formate and the hydroxide. The Co atom lies in a fac octahedron of six O atoms, three of which belong to three different formates and the other three to different hydroxides.
metal-organic compounds
The Zr atom in the title salt, (C10H10N2)2[Zr(C2O4)4], is chelated by four oxalate anions in a square-antiprismatic geometry. The cations and anions are linked by short N—HO and long C—HO hydrogen bonds into a layer structure. The Zr atom lies on a special position of site symmetry 2.
O and long C—HO hydrogen bonds into a layer structure. The Zr atom lies on a special position of site symmetry 2.metal-organic compounds
The polyanion of the title compound, {(C2H10N2)1.5[Ce(SO4)3(H2O)]·2H2O}n, adopts a layer structure, and the cations and uncoordinated water molecules are located between the layers. One of the cations lies on a center of inversion. The compound is isostructural with the Nd analog, whose structure was recently reported [Liu, Meng, Li, Cui, Wang & Pang (2005). J. Solid State Chem. 178, 1003–1007].
