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In the title solvate, C44H30Cl2N2O2·2C4H8O2, the complete polycyclic mol­ecule is generated by inversion symmetry. The dihedral angle between the quinolyl ring system (Q; r.m.s. deviation = 0.020 Å) and the pendant phenyl ring is 78.80 (6)°; the dihedral angle between Q and the central benzene ring is 85.92 (7)°. In the crystal, the components are linked by C—H...O and C—H...π inter­actions, generating (110) layers. Weak aromatic π–π stacking [centroid–centroid distances = 3.7025 (11) and 3.8124 (10) Å] is also observed.

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The title salt, (C7H11N2)[FeCl4], consists of one essentially planar (the r.m.s. deviation for all non-H atoms being 0.004 Å) 4-(dimethyl­amino)­pyridinium cation and a tetra­hedral tetra­chloridoferrate(III) anion. The cations and anions are arranged in layers parallel to (010). Besides electrostatic inter­actions, the crystal packing features N—H...Cl and C—H...Cl hydrogen bonds between cations and anions, forming a three-dimensional network.

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The structure of the title compound, [Cd(NCS)2(C7H9NO)2]n, consists of cadmium–thio­cyanate layers parallel to the ab plane. Pairs of CdII ions are bridged by two end-to-end inversely bridging μ-NCS-N:S thio­cyanate groups, forming a two-dimensional network with the remaining two trans positions of the octa­hedrally coordinated CdII ions occupied by the N atoms of two neutral 2-meth­oxy­aniline ligands. The crystal structure is stabilized by intra­layer N—H...S hydrogen bonds.

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In the title 1:1 adduct, C9H12N2O2·C6H6O, the dihedral angle between the benzene ring and the salicylic amide group is 6.68 (6)°. The conformation of the amide group is supported by two intra­molecular N—H...O hydrogen bonds, which close S(6) and S(7) rings. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, generating (100) sheets.

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The structure of the title polymeric compound, [Cd(SCN)2(C6H8N2)2]n, exhibits a two-dimensional staircase-like structure parallel to (010) in which the CdII atom lies on a twofold rotation axis and has a distorted octa­hedral CdS2N4 geometry involving four μ-1,3-(SCN) group donors and two N-atom donors from 1,3-phenyl­enedi­amine ligands, which also have twofold symmetry. The major contributions to the cohesion and the stability of this two-dimensional polymeric structure are the covalent Cd—S,N bonds and one weak intra­layer N—H...S hydrogen bond.

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The title polymeric coordination compound, {[Co2(C10H2O8)(H2O)8]·8H2O}n, was obtained by slow diffusion of a dilute aqueous solution of CoCl2 and the sodium salt of benzene-1,2,4,5-tetracarboxylic acid (H4btec) through an agar–agar gel bridge in a U-shaped tube. The two independent Co2+ ions are each situated on an inversion centre and are coordinated in a slightly distorted octa­hedral geometry by four water O atoms and two carboxyl­ate O atoms from two btec4− ligands (-1> symmetry), forming a layer parallel to (11-1). This layer can be described as a mol­ecular two-dimensional square grid with the benzene rings at the nodes and the CoII atoms connecting the nodes. O—H...O hydrogen-bonding interactions involving the coordinating water molecules, the carboxylate O atoms and lattice water molecules lead to the formation of a three-dimensional network.

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In the crystal of the title compound, C7H9N3O4, mol­ecules are linked by weak C—H...O hydrogen bonds into chains along the a-axis direction. The dihedral angle between the ring and the nitro group is 3.03 (6), while that between the ring and the acetate group is 85.01 (3)°.

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In the title compound, C5H7N5S·H2O, the main mol­ecule is approximately planar, with a maximum deviation from the mean plane through the non-H atoms of 0.1478 (12) Å for the amine N atom. In the crystal, the components are connected via N—H...O, N—H...S and O—H...N hydrogen bonds, forming a three-dimensional network.

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In the title hydrate, C17H18N2O5·H2O, the complete organic mol­ecule is generated by a crystallographic mirror plane with one C and one O atom lying on the mirror plane. The O atom of the water mol­ecule has m site symmetry. Two symmetry-related intra­molecular O—H...O hydrogen bonds complete S(6) rings in the organic mol­ecule. In the crystal, the components are linked into (010) sheets by O—H...O and N—H...O hydrogen bonds.
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