The title compounds, C20H19NO3, (1), and C20H17Cl2NO, (2), are the 3-hy-droxy-benzyl-idene and 2-chloro-benzyl-idene derivatives, respectively, of curcumin [systematic name: (1E,6E)-1,7-bis-(4-hy-droxy-3-meth-oxy-phen-yl)-1,6-hepta-diene-3,5-dione]. The dihedral angles between the benzene rings in each compound are 21.07 (6)° for (1) and 13.4 (3)° for (2). In both compounds, the piperidinone ri...

In the title compound, C21H12Br2N2O3, a 1,4-diaroyl pyrazole derivative, the dihedral angles between the naphthalene ring system and the pyrazole ring, the pyrazole and benzene rings, and the naphthalene ring system and benzene ring are 50.0 (2), 51.1 (2) and 1.34 (16)°, respectively. The phenolic proton forms an intra-molecular O-H⋯O hydrogen bond with the adjacent carbonyl O atom. In the crys...

Superplastic materials show a very high ductility. This is due to both peculiar process conditions and material intrinsic characteristics. However, a number of superplastic materials are subjected to cavitation during superplastic deformation. Evidently, extensive cavitation imposes significant limitations on their commercial application. The deformation and failure of superplastic sheet metals...

The title compound, C(12)H(8)Cl(2)N(4)O, is non-planar, the dihedral angle formed between the pendant pyrazine and benzene rings being 12.55 (11)°. An intra-molecular N-H⋯N hydrogen bond occurs. The amide groups self-associate via N-H⋯O hydrogen bonding, forming supra-molecular chains with base vector [101], which are stabilized by C-H⋯O contacts. C-H⋯N inter-actions are formed orthogonal to th...

The title compound, C21H14N2O2, was prepared by Pictet-Spengler cyclization of tryptamine and 4-formyl coumarin. In the mol-ecule, the dihedral angle between the mean planes of the coumarin and β-carboline ring systems is 63.8 (2)°. In the crystal, mol-ecules are linked via N-H⋯N hydrogen bonds, forming chains along the b-axis direction. Within the chains, there are a number of offset π-π inter...

In the title compound, C(7)H(10)N(+)·ClO(4) (-)·C(20)H(24)O(6), the proton-ated benzyl-amine cation forms a rotator-stator complex with the 18-crown-6 (1,4,7,10,13,16-hexa-oxacyclo-octa-deca-ne) mol-ecule via N-H⋯O hydrogen bonds. The cations are associated via weak C-H⋯π inter-actions, forming chains parallel to [011], while the perclorate anions are located between these chains.

In the crystal structure of the title salt, C10H16N3O(+)·C7H5O2 (-), the cations and anions are linked to each other via N-H⋯O hydrogen bonds, forming infinite chains running along [010]. The crystal structure also features C-H⋯O and π-π stacking inter-actions, which assemble the chains into supra-molecular layers parallel to (100). The π-π stacking inter-actions are observed between the pyridi...

In the title compound, C12H9Cl2NO3, which is the fungicide vinclozolin, the dihedral angle between the oxazolidine ring mean plane [r.m.s. deviation = 0.029 Å] and the benzene ring is 77.55 (8)°. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, forming chains along [010]. The chains are linked by short Cl⋯Cl contacts [3.4439 (3) and 3.5798 (3) Å], resulting in a three-dimensional...

In the title compound, C(11)H(14)Cl(3)NO(6), the fused five-membered oxazoline and tetra-hydro-furan rings are essentially planar with maximum deviations of 0.069 (1) and 0.031 (1) Å, respectively, and make a dihedral angle of 64.23 (11)° with each other. In the crystal, mol-ecules are linked by O-H⋯O and C-H⋯O hydrogen bonds, forming chains along the b-axis direction. Further C-H⋯O hydrogen bo...

In the title compound, C12H10BrN3O, the dihedral angle between the mean planes of the 4-bromo-phenyl and pyrazin-2-yl rings is 54.6 (3)°. An intra-molecular C-H⋯O hydrogen bond generates an S(6) graph-set motif. In the crystal, weak N-H⋯N hydrogen bonds link the mol-ecules into chains along [100]. The chains are linked via C-H⋯N and C-H⋯O hydrogen bonds, forming two-dimensional networks lying p...