journal menu
inorganic compounds
The title compound, Cs4SrSn3Se9, contains infinite `dreier' [SnSe3]2- chains consisting of corner-linked SnSe4 tetrahedra. Whereas the larger independent caesium cations exhibit coordination numbers of 8 and 9, a distorted octahedral environment is observed for the smaller strontium cation.
inorganic compounds
The title compound, Cs6Sb4Se9·0.5H2O, contains discrete [Sb4Se9]6- chain anions consisting of corner-linked SbSe3 pyramids. Molecular C2 symmetry is observed for these nonaselenidoantimonate(III) anions, which exhibit bridging Sb-Se distances in the range 2.615 (2)-2.650 (3) Å and shorter terminal Sb-Se distances between 2.507 (3) and 2.522 (3) Å.
inorganic compounds
The title compound, Cs3AsSe4·H2O, contains discrete tetrahedral tetraselenidoarsenate(V) anions. The solvent water O atom participates in the coordination spheres of all three independent Cs cations, as do, in each case, seven Se atoms.
organic compounds
The title compound, 4-phenylpyridinium-3-squarate, C15H9NO3, exhibits an interplanar angle between the pyridinium and squarate rings of 0.6 (1)°. It displays a dipolar electronic ground-state structure, with a positively charged pyridinium fragment and a negatively charged squarate moiety. In the molecule, the two aromatic rings are twisted by 31.6 (1)°. The bond lengths within the squarate system represent average values for the two possible resonance structures, with a central typical carbonyl bond [1.203 (2) Å] flanked by two longer `semicarbonyl' bonds of lengths 1.228 (2) and 1.221 (2) Å.
organic compounds
The title compound, 2C9H8NO2+·C4O42−, contains a dianion with approximately D4h symmetry [C—C = 1.465 (4)–1.470 (4) Å and C—O = 1.248 (4)–1.264 (4) Å]. Individual dianions are linked to four neighbouring 8-hydroxyquinolinium cations by O
H—N [2.666 (4) and 2.681 (4) Å] and OH—O [2.596 (3) and 2.605 (3) Å] hydrogen bonds to generate a polymeric chain.
H—N [2.666 (4) and 2.681 (4) Å] and OH—O [2.596 (3) and 2.605 (3) Å] hydrogen bonds to generate a polymeric chain. metal-organic compounds
The title compound, [Mn(C2H8N2)3]2[Sn2Te6], contains [Mn(en)3]2+ (en is ethylenediamine) complex cations and crystallographically centrosymmetric [Sn2Te6]4− anions in its monoclinic crystal structure. The five-membered chelate rings of symmetry-related cations exhibit either λλλ or δδδ conformations. Two SnTe4 tetrahedra edge-share to afford the hexatelluridodistannate(IV) anions, whose terminal Sn—Te bonds are significantly shorter than the bridging Sn—Te bonds.
metal-organic compounds
Solvothermal reaction of Ge and Se with Mn(CH3COO)2·4H2O in the presence of [(CH3)3NH]Cl generates the open framework quaternary selenidogermanate(IV) [(CH3)3NH]2[MnGe4Se10], which contains corner-linked adamantanoid Ge4Se10 cages and MnSe4 tetrahedra. The trimethylammonium counter-cations are disordered and exhibit an S4 crystallographic site symmetry. Whereas the Ge-Se distances within the Ge4Se6 core lie in the range 2.357 (1)-2.370 (1) Å, a significantly shorter Ge-Se bond length of 2.284 (1) Å is observed for the bridging Se atom to the MnSe4 units.
metal-organic compounds
The title compound, [Cs(C12H24O6)]2[As2Se6], contains two independent centrosymmetric [As2Se6]2− counter-anions, in which AsSe3 pyramids are linked by two Se—Se bonds into a chair-shaped six-membered ring. Four of the Se atoms of the first [As2Se6]2− anion coordinate the Cs atoms of dimeric [{Cs(18-crown-6)}2(μ-As2Se6)] units that are joined by additional OCs interactions into polymeric sheets. In contrast, all six Se atoms of the second [As2Se6]2− anion coordinate Cs atoms within discrete [{Cs(18-crown-6)}2(μ-As2Se6)] dimers.
Cs interactions into polymeric sheets. In contrast, all six Se atoms of the second [As2Se6]2− anion coordinate Cs atoms within discrete [{Cs(18-crown-6)}2(μ-As2Se6)] dimers.metal-organic compounds
The title compound, Cs[As(CH3)2Se2], contains discrete tetrahedral dimethyldiselenidoarsenate(V) anions and Cs cations, with As and Cs located on a crystallographic twofold rotation axis. A distorted octahedral coordination is observed for the caesium counter-cation, with CsSe distances in the range 3.706 (2)–3.762 (2) Å.
Se distances in the range 3.706 (2)–3.762 (2) Å.organic compounds
Cations of the title compound, 1-carbamoyl-2-(4-hydroxyphenyl)ethylammonium chloride monohydrate, C9H13N2O2+·Cl−·H2O, are connected by intermolecular N—HO [NO = 2.905 (3) Å] hydrogen bonds between the amide and 4-hydroxy functions into helical chains propagating along the [010] axis. The Cl− ions and water O atom participate in a complex pattern of hydrogen bonds to link these ribbons into a three-dimensional network.
O [NO = 2.905 (3) Å] hydrogen bonds between the amide and 4-hydroxy functions into helical chains propagating along the [010] axis. The Cl− ions and water O atom participate in a complex pattern of hydrogen bonds to link these ribbons into a three-dimensional network.organic compounds
Cations of the title compound, C3H9N2O+·C4HO4−·H2O, are connected by intermolecular Nammonium—HOamide hydrogen bonds into helical chains propagating in the [010] direction. These chains are further linked by Nammonium—HO hydrogen bonds to the hydrogensquarate anions, which in turn form O—HO-bridged chains in the [100] direction, thereby giving rise to a three-dimensional network. The water O atoms participate in two O—HO hydrogen bonds to the anions and one OH—Namide bridge to the cation.
Oamide hydrogen bonds into helical chains propagating in the [010] direction. These chains are further linked by Nammonium—HO hydrogen bonds to the hydrogensquarate anions, which in turn form O—HO-bridged chains in the [100] direction, thereby giving rise to a three-dimensional network. The water O atoms participate in two O—HO hydrogen bonds to the anions and one OH—Namide bridge to the cation.
