Synthesis and crystal structure of 2-(1,3-dithietan-2-yl-idene)cyclo-hexane-1,3-dione.

The title compound, C8H8O2S2, contains a cyclo-hexane-1,3-dione ring, which has a twist-boat conformation. The C2S2 ring is close to planar (r.m.s. deviation = 0.023 Å) and the dihedral angle between the mean planes of the cyclo-hexane and 1,3-dithietane rings is 9.1 (3)°. Short intra-molecular S⋯O contacts occur [2.719 (5) and 2.740 (5) Å]. In the crystal, the mol-ecules are linked by weak C-H⋯S hydrogen bonds and short [3.165 (5) Å] S⋯O contacts, forming (010) layers. The prevalence of these inter-actions is illustrated by an analysis of the three-dimensional Hirshfeld surface and by two-dimensional fingerprint plots.

2,6-Di-bromo-4-methyl-aniline.

In the title compound, C7H7Br2N, the C-C-C bond angles of the benzene ring are notably distorted and two short intamolecular N-H⋯Br contacts occur. In the crystal, the mol-ecules are linked by N-H⋯N hydrogen bonds to generate C(2) chains propagating in the [100] direction.

Erratum: Crystal structure and Hirshfeld surface analysis of (Z)-4-(4-hy-droxy-benzyl-idene)-3-methyl-isoxazol-5(4H)-one. Corrigendum.

[This corrects the article DOI: 10.1107/S2056989018007867.].

Crystal structure and Hirshfeld surface analysis of 2,6-di-iodo-4-nitro-toluene and 2,4,6-tri-bromo-toluene.

The title compounds, 2,6-di-iodo-4-nitro-toluene (DINT, C7H5I2NO2) and 2,4,6-tri-bromo-toluene (TBT, C7H5Br3,), are tris-ubstituted toluene mol-ecules. Both mol-ecules are planar, only the H atoms of the methyl group, and the nitro group in DINT, deviate significantly from the plane of the benzene ring. In the crystals of both compounds, mol-ecules stack in columns up the shortest crystallographic axis, viz. the a axis in DINT and the b axis in TBT. In the crystal of DINT, mol-ecules are linked via short N-O⋯I contacts, forming chains along [100]. In TBT, mol-ecules are linked by C-H⋯Br hydrogen bonds, forming chains along [010]. Hirshfeld surface analysis was used to explore the inter-molecular contacts in the crystals of both DINT and TBT.

Crystal structure, characterization and Hirshfeld analysis of bis-{(E)-1-[(2,4,6-tri-bromo-phen-yl)diazen-yl]naphthalen-2-olato}copper(II) dimethyl sulfoxide monosolvate.

In the title compound, [Cu(C16H8Br3N2O)2]·C2H6OS, the CuII atom is tetra-coordinated in a square-planar coordination, being surrounded by two N atoms and two O atoms from two N,O-bidentate (E)-1-[(2,4,6-tri-bromo-phen-yl)diazen-yl]naphthalen-2-olate ligands. The two N atoms and two O atoms around the metal center are trans to each other, with an O-Cu-O bond angle of 177.90 (16)° and a N-Cu-N bond angle of 177.8 (2)°. The average distances between the CuII atom and the coordinated O and N atoms are 1.892 (4) and 1.976 (4) Å, respectively. In the crystal, complexes are linked by C-H⋯O hydrogen bonds and by π-π inter-actions involving adjacent naphthalene ring systems [centroid-centroid distance = 3.679 (4) Å]. The disordered DMSO mol-ecules inter-act weakly with the complex mol-ecules, being positioned in the voids left by the packing arrangement of the square-planar complexes. The DMSO solvent mol-ecule is disordered over two positions with occupancies of 0.70 and 0.30.

Crystal structure and Hirshfeld surface analysis of (Z)-4-(4-hy-droxy-benzyl-idene)-3-methyl-isoxazol-5(4H)-one.

The title compound, C11H9NO3, contains an isoxazole and a hy-droxy-benzyl-idene ring, which are inclined to each another by 3.18 (8)°. There is an intra-molecular C-H⋯O contact forming an S(7) ring. In the crystal, mol-ecules stack head-to-tail in columns along the b-axis direction, linked by offset π-π inter-actions [inter-centroid distances of 3.676 (1) and 3.723 (1) Å]. The columns are linked by O-H⋯O and O-H⋯N hydrogen bonds, forming layers parallel to the ab plane. The layers are linked by C-H⋯O hydrogen bonds, forming a supra-molecular three-dimensional framework. An analysis of the Hirshfeld surfaces points to the importance of the O-H⋯O and O-H⋯N hydrogen bonding in the packing mechanism of the crystal structure.

Crystal structure of 1,3,5-trimethyl-2,4-di-nitro-benzene.

In the title compound, C9H10N2O4, the planes of the nitro groups subtend dihedral angles of 55.04 (15) and 63.23 (15)° with that of the aromatic ring. These tilts are in opposite senses and the mol-ecule possesses approximate mirror symmetry about a plane normal to the mol-ecule. In the crystal, mol-ecules form stacks in the [100] direction with adjacent mol-ecules related by translation, although the centroid-centroid separation of 4.136 (5) Šis probably too long to regard as a significant aromatic π-π stacking inter-action. An extremely weak C-H⋯O inter-action is also present.

Crystal structure of 4,6-di-chloro-5-methyl-pyrimidine.

The title compound, C5H4Cl2N2, is essentially planar with an r.m.s. deviation for all non-H atoms of 0.009 Å. The largest deviation from the mean plane is 0.016 (4) Šfor an N atom. In the crystal, mol-ecules are linked by pairs of C-H⋯N hydrogen bonds, forming inversion dimers, enclosing an R (2) 2(6) ring motif.

Iodo-durene.

THE TITLE COMPOUND (SYSTEMATIC NAME: 1-iodo-2,3,5,6-tetra-methyl-benzene), C10H13I, crystallizes in the chiral space group P212121. The I atom is displaced by 0.1003 (5) Šfrom the mean plane of the ten C atoms [maximum deviation = 0.018 (6) Å]. In the crystal, there are no significant inter-molecular inter-actions present.