Crystal structure and Hirshfeld surface analysis of a bromo-chalcone: ()-1-(3-bromo-phen-yl)-3-(2,6-di-chloro-phen-yl)prop-2-en-1-one.

In the title chalcone derivative, CHBrClO, the aryl rings are inclined to each by 14.49 (17)°, and the configuration about the C=C bond is . There is a short intra-molecular C-H⋯Cl contact present resulting in the formation of an (6) ring motif.

Crystal structure and Hirshfeld surface analysis of ()-3-(2-chloro-phen-yl)-1-(2,5-di-chloro-thio-phen-3-yl)prop-2-en-1-one.

The mol-ecular structure of the title compound, CHClOS, consists of a 2,5- di-chloro-thio-phene ring and a 2-chloro-phenyl ring linked a prop-2-en-1-one spacer. The dihedral angle between the 2,5-di-chloro-thio-phene and 2-chloro-phenyl rings is 9.69 (12)°.

Crystal structure and Hirshfeld surface analysis of (2)-3-(2,4-di-chloro-phen-yl)-1-(2,5-di-chloro-thio-phen-3-yl)prop-2-en-1-one.

The mol-ecular structure of the title compound, CHClOS, consists of a 2,5-di-chloro-thio-phene ring and a 2,4-di-chloro-phenyl ring linked a prop-2-en-1-one spacer. The dihedral angle between the 2,5-di-chloro-thio-phene ring and the 2,4-di-chloro-phenyl ring is 12.24 (15)°.

Crystal structure and Hirshfeld surface analysis of ()-3-(2-chloro-4-fluoro-phen-yl)-1-(2,5-di-chloro-thio-phen-3-yl)prop-2-en-1-one.

In the title chalcone-thio-phene derivative, CHClFOS, the aromatic rings are inclined to one another by 12.9 (2)°, and the thio-phene ring is affected by π-conjugation. In the crystal, mol-ecules are linked by C-H⋯F hydrogen bonds, forming an (8) ring motif.

Crystal structure and Hirshfeld surface analysis of (2)-3-(3-bromo-4-fluoro-phen-yl)-1-(3,4-di-meth-oxy-phen-yl)prop-2-en-1-one.

In the mol-ecule of the title compound, CHBrFO, the aromatic rings are tilted with respect to the enone bridge by 13.63 (14) and 4.27 (15)°, and form a dihedral angle 17.

Crystal structure and Hirshfeld surface analysis of (2)-3-(3-chloro-phen-yl)-1-(3,4-di-meth-oxy-phen-yl)prop-2-en-1-one.

In title compound, CHClO, the dihedral angle between the benzene and chloro-phenyl rings is 18.46 (7)°. In the crystal, mol-ecules are linked by C-H⋯O hydrogen contacts, enclosing an (14) ring motif, and by a further C-H⋯O hydrogen contact, forming a two-dimensional supra-molecular structure extending along the direction parallel to the plane.

Crystal structure and Hirshfeld surface analysis of a pyridiniminium bromide salt: 1-[2-([1,1'-biphen-yl]-4-yl)-2-oxoeth-yl]-3-methyl-1,4-di-hydro-pyridin-4-iminium bromide.

In the cation of the title salt, CHNO·Br, the phenyl rings are inclined to one another by 38.38 (8)°, whereas the central phenyl ring and the pyridiniminium ring are almost perpendicular with a dihedral angle of 87.37 (9)°.

Crystal structure of {[2-hy-droxy-2-(3-meth-oxy-phen-yl)cyclo-hex-yl]meth-yl}di-methyl-ammonium benzoate.

The title compound, C16H26NO2 (+)·C7H5O2 (-), is a benzoate salt of the painkiller Tramadol. The six-membered cyclo-hexane ring of the cation adopts a slightly distorted chair conformation and carries OH and 3-meth-oxy-phenyl substituents at the 2-position and a protonated methyl-aza-niumylmethyl group at the 3-position. In addition, a weak intra-molecular C-H⋯O hydrogen bond is observed in the cation.

Crystal structure of 2-cyano-N-(furan-2-ylmeth-yl)-3-(3-nitro-phen-yl)propanamide.

In the title compound, C15H11N3O4, the acetamide group is inclined to the furan ring by 66.5 (1)°. The dihedral angle between the furan ring and the benzene ring is 66.

Erratum: Crystal structure of 2-cyano-N-(furan-2-ylmeth-yl)acetamide. Corrigendum.

The address of one of the authors in the paper by Subhadramma et al. [Acta Cryst. (2015), E71, o455-o456] is corrected.

Crystal structure of 2-cyano-N-(furan-2-ylmeth-yl)acetamide.

In the title compound, C8H8N2O2, the acetamide unit is inclined to the furan ring by 76.7 (1)°. In the crystal, mol-ecules are linked by N-H⋯O and C-H⋯O hydrogen bonds, generating C(4) chains along [100].

Bis(2-bromo-benz-yl) ether.

In the title compound, C14H12Br2O, the dihedral angle between the aromatic rings is 2.7 (3)° and the Br atoms lie on the same side of the mol-ecule. No inter-molecular inter-actions occur in the crystal beyond van der Waals contacts.

2-Nitro-benzyl methane-sulfonate.

In the title compound, C8H9NO5S, the dihedral angle between the benzene ring and the nitro group is 5.86 (15)° and the C-C-O-S group adopts an anti conformation [torsion angle = -168.44 (15)°].

1-(3-Oxo-3-phenyl-prop-yl)piperidinium chloride.

In the title salt, C14H20NO(+)·Cl(-), the piperidine ring adopts a chair conformation. In the crystal, the cations and anions are linked by classical N-H⋯Cl hydrogen bond and weak C-H⋯Cl and C-H⋯O hydrogen bonds; the C-H⋯O hydrogen bonds exhibit R 2 (2)(14) ring motifs while the C-H⋯Cl hydrogen bonds link the mol-ecules into chains along the a-axis direction. π-π stacking is observed between parallel phenyl rings of adjacent cations, the centroid-centroid distance being 3.

Methyl 2-{2-[(2-methyl-phen-oxy)meth-yl]phen-yl}-2-oxoacetate.

In the title compound, C17H16O4, the dihedral angle between the benzene rings is 4.4 (2)°. In the crystal, weak C-H⋯O hydrogen bonds connect mol-ecules along [001].

Amicarbazone.

Three independent mol-ecules comprise the asymmetric unit of the title compound, C10H19N5O2, (systematic name: 4-amino-N-tert-butyl-3-isopropyl-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide) . In all three mol-ecules, the triazole ring and the carboxamide group are almost coplanar [within 4.0-5.

Orphenadrinium dihydrogen citrate.

In the title salt, C(18)H(24)NO(+)·C(6)H(7)O(7) (-), the dihedral angle between the benzene rings in the cation is 74.2 (5)°. In the crystal, anion-anion O-H⋯O hydrogen bonds and weak O-H⋯O inter-actions form infinite chains along [100].

Tramadolium picrate.

In the title salt {systematic name: [2-hy-droxy-3-(3-meth-oxy-phen-yl)cyclo-hexyl-meth-yl]dimethyl-aza-nium 2,4,6-trinitro-phenol-ate}, C(16)H(26)NO(2) (+)·C(6)H(2)N(3)O(7) (-), the cation is protonated at the N atom. The cyclo-hexane ring adopts a chair conformation with the hy-droxy substituent in an axial position. In the crystal, O-H⋯O and N-H⋯O hydrogen bonds link the cations and anions into supra-molecular chains along [100].

1,3-Bis(biphenyl-4-yl)-2,2-dibromo-3-oxopropyl acetate.

In the title compound, C(29)H(22)Br(2)O(3), the dihedral angles between the mean planes of the benzene rings within each biphenyl group are 26.7 (8) and 30.9 (8)°.

Opipramol dihydro-chloride.

4-{3-[2-aza-tricyclo-[9.4.0.

2-(2-Benzyl-phen-yl)propan-2-ol.

There are two mol-ecules in the asymmetric unit of the title compound, C(16)H(18)O, a tertiary alcohol featuring a 2-benzyl-phenyl substituent. Co-operative O-H⋯O hydrogen bonds connect the mol-ecules into tetra-mers.

2-Chloro-N-[2-(2-fluoro-benzo-yl)-4-nitro-phen-yl]-N-methyl-acetamide.

The title compound, C(16)H(12)ClFN(2)O(4), crystallizes with two mol-ecules in the asymmetric unit in which the dihedral angles between the mean planes of the two benzene rings are 65.1 (7) and 65.6 (6)°.

9,9-Dimethyl-9,10-dihydroanthracene.

In the title compound, C(16)H(16), the central benzene ring adopts a boat conformation, with a dihedral angle of 34.7 (9)° between the mean planes of the two fused benzene rings. The two methyl groups at the apex of the central benzene ring are in axial and equatorial conformations.

Tramadol hydro-chloride-benzoic acid (1/1).

In the cation of the title co-crystal salt {systematic name: [2-hydroxy-2-(3-meth-oxy-phen-yl)cyclo-hexyl-meth-yl]dimethyl-aza-nium chloride-benzoic acid (1/1)}, C(16)H(31)NO(2) (+)·Cl(-)·C(7)H(6)O(2), the N atom is protonated and the six-membered cyclo-hexane ring adopts a slightly distorted chair conformation. The dihedral angle between the mean planes of the benzene rings in the cation and the benzoic acid mol-ecule is 75.5 (9)°.

4-(4-Chloro-phen-yl)-4-hy-droxy-piperidinium 2-(2-phenyl-eth-yl)benzoate.

In the title compound, C(11)H(15)ClNO(+)·C(15)H(13)O(2) (-), the piperidinium ring adopts a chair conformation. In the crystal, cations and anions are connected by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds, forming two-dimensional networks parallel to the bc plane. Furthermore, the crystal structure is stabilized by weak C-H⋯π inter-actions.