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The structures are reported of nine closely related tetrahydro-1,4-epoxy-1-benzazepines carrying pendant heterocyclic substituents, namely: 2-exo-(5-nitrofuran-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C14H12N2O4, (I), 7-fluoro-2-exo-(1-methyl-1H-pyrrol-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H15FN2O, (II), 7-fluoro-2-exo-(5-methylfuran-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H14FNO2, (III), 7-fluoro-2-exo-(3-methylthiophen-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H14FNOS, (IV), 7-fluoro-2-exo-(5-methylthiophen-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H14FNOS, (V), 7-chloro-2-exo-(5-methylfuran-2-yl)-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H14ClNO2, (VI), 2-exo-(5-methylfuran-2-yl)-7-trifluoromethoxy-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C16H14F3NO3, (VII), 2-exo-(3-methylthiophen-2-yl)-7-trifluoromethoxy-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C16H14F3NO2S, (VIII), and 2-exo-(5-nitrofuran-2-yl)-7-trifluoromethoxy-2,3,4,5-tetrahydro-1,4-epoxy-1H-1-benzazepine, C15H11F3N2O5, (IX). All nine compounds crystallize in centrosymmetric space groups as racemic mixtures with configuration (2RS,4SR). There are no direction-specific interactions between the molecules in (V). The molecules in (III), (IV), (VI) and (VII) are linked into simple chains, by means of a single C—H...O hydrogen bond in each of (III), (VI) and (VII), and by means of a single C—H...π(arene) hydrogen bond in (IV), while the molecules in (VIII) are linked into a chain of rings. In each of (I) and (II), a combination of one C—H...O hydrogen bond and one C—H...π(arene) hydrogen bond links the molecules into sheets, albeit of completely different construction in the two compounds. In (IX), the sheet structure is built from a combination of four independent C—H...O hydrogen bonds and one C—H...π(arene) hydrogen bond. Comparisons are made with some related compounds.

The title metal-organic framework, [Cd(3)(C(12)H(9)O(6))(2)(C(10)H(8)N(2))(2)](n), has been synthesized by a solvothermal reaction. The Cd(II) ions are located in CdO(4)N(2) and CdO(6) six-coordinated environments, with the latter Cd(II) ion lying on an inversion centre. The 2,4,6-trimethylbenzene-1,3,5-tricarboxylate ligand (TMBTC) connects the Cd(II) ions to form a two-dimensional sheet incorporating hourglass-like [Cd(3)(COO)(6)] secondary building units (SBUs). Topologically, taking the TMBTC ligand and the [Cd(3)(COO)(6)] SBU as 3- and 6-connected nodes, respectively, the overall two-dimensional sheet can be simplified to a rare (3,6)-connected 2-nodal kgd (Kagomé dual) net with a short Schläfli vertex notation of {4(3)}(2){4(6).6(6).8(3)}, which further stacks into a three-dimensional supramolecular framework through π-π stacking interactions.

The title compound, C28H20N2O2, forms two conformational polymorphs, (I) and (II), where the mol­ecular structures are similar except for the orientation of the two hy­droxy groups. In (I), which was obtained by slow evaporation from chloro­form, the two hy­droxy groups have an anti conformation. The mol­ecules form a sheet structure within the ac plane, where the hy­droxy groups form zigzag hydrogen bonds. In (II), which was obtained by slow evaporation from acetonitrile, the two hy­droxy groups have a syn conformation. The mol­ecules form a double-sheet structure within the ab plane, where the hy­droxy groups form 4-helix hydrogen bonds.

In the title compound, C(5)H(8)N(6)OS(2), the supramolecular architecture is sustained by two N--H...O and three N--H...S hydrogen bonds, and by N.S electrostatic interactions. The hydrogen-bond network generates a sheet structure, which extends in the a and b directions and is one c-cell dimension thick. These extended sheets are then linked across inversion centres in the c direction by N...S electrostatic interactions, thus forming a three-dimensional network. The principal intermolecular dimensions include N(H)...O distances of 2.8393 (17) and 3.0268 (16) A, N(H)...S distances in the range 3.2896 (14)-3.5924 (16) A and N...S distances of 3.0822 (16) A.

Crystals of sulfathiazole, 4-amino-N-thiazol-2-ylidenebenzenesulfonamide, C 9 H 9 N 3 O 2 S 2 , formed from boiling water are shown to be a fifth polymorph. The crystal structure contains two independent molecules, which associate through hydrogen bonds and van der Waals interactions to produce a two-dimensional sheet structure.

The crystal structure of 4,4'-bipyridyl, C 10 H 8 N 2 , at 203 K contains two independent, non-planar, molecules whose mean planes subtend an angle of 14.1(8)°. The long axes of the two molecules are oriented at approximately 88° to each other, allowing interaction between the N atoms and phenyl-H atoms on adjacent molecules and thereby giving rise to a sheet structure. The two molecules are primarily differentiated by the dihedral angle between the connected phenyl rings [18.50(12) and 34.85(10)°].

The structure of tetragermanium strontium nonaoxide, SrGe 4 O 9 , comprises two different types of sheet structure stacked alternately along the c axis. One sheet comprises GeO 6 octahedra and SrO 8 polyhedra while the other sheet contains three-membered rings of GeO 4 tetrahedra. In addition, this crystal structure shows a basic unit of the superstructures which are found for PbGe 4 O 9 .

The crystal structure of trans-tetraaquabis[1,3,5-triazine-2,4,6-tricarbodiimidato(1-)-N]cobalt(II) hexahydrate, [Co(C6H2N9)2(H2O)4].6H2O, shows the cobalt(II) metal ion to be octahedrally coordinated by two trans doubly protonated tricyanomelamine ligands and four water molecules. Hydrogen bonding between ligands yields a two-dimensional sheet structure.

The title compound, C 10 H 8 N 2 O 6 , forms C-H...O hydrogen-bonded inversion dimers in the crystal with a calculated (AM1) energy of -8.2 kcal mol -1 (1 cal = 4.184 J). These dimers in turn form a planar sheet structure which is stacked along the [100] direction.

The X-ray crystal structure analysis of tertbutoxycarbonyl-L-phenylalanyl-D-leucine methyl ester showed two crystallographically independent molecules, each of them taking a similar open conformation in which the tert-butoxycarbonyl group and D-leucine isobutyl side chain are located facing parallel to each other. In the crystal, these molecules are piled up alternately along the b axis and form an infinite sheet structure through four independent NH...O-C hydrogen bonds

The title complex, poly[bis(mu(6)-pyridine-2,6-dicarboxylato N-oxide)nickel(II)disilver(I)], [Ag(2)Ni(C(7)H(3)NO(5))(2)](n) or [Ag(2)Ni(pydco)(2)](n) (H(2)pydco = pyridine-2,6-dicarboxylic acid N-oxide), has a two-dimensional sheet structure. The two carboxylate groups adopt two coordination modes. The Ni(II) ion displays a distorted octahedral geometry, bonded to two carboxylate O atoms of two different pydco ligands and four O donors from another two ligands, i.e. two carboxylate O atoms and two N-oxide O atoms. The Ag(I) ion adopts a tetrahedral coordination, linked by three O atoms of three different carboxylate groups and an N-oxide O atom.