N-(2,3,4-Trifluoro­phen­yl)morpholine-4-carboxamide

In title mol­ecule, C₁₁H₁₁F₃N₂O₂, the central –N—C(=O)—N– unit is essentially planar [maximum deviation = 0.013 (2) Å] and forms a dihedral angle of 57.33 (9)° with the benzene ring. The morpholine ring is in a chair conformation. In the crystal, mol­ecules are linked into chains along [001] by N—H...O hydrogen bonds.

catena-Poly[[[diaqua­diformatonickel(II)]-μ-1,4-bis­(1H-benzimidazol-1-yl)benzene] dihydrate]

In the title one-dimensional coordination polymer, {[Ni(CHO₂)₂(C₂₀H₁₄N₄)(H₂O)₂]·2H₂O}_n, the Ni^II atom lies on a crystallographic inversion centre. It is coordinated by two formate O atoms, two water O atoms and two N atoms from two 1,4-bis­(1H-benzimidazol-1-yl)benzene (bzb) ligands, resulting in a distorted trans-NiN₂O₄ octa­hedral coordination geometry. The bzb mol­ecule acts as a bridging ligand to connect the metal atoms into a chain propagating in [1]. The dihedral angle between the benzimidazole ring and the central benzene ring in the ligand is 38.16 (9)°. In the crystal, O—H...O hydrogen bonds crosslink the chains into (010) sheets.

catena-Poly[[tetra­kis­(1H-pyrazole-κN²)copper(II)]-μ-hexa­fluoridosilicato-κ²F:F′]

In the title one-dimensional coordination polymer, [Cu(SiF₆)(C₃H₄N₂)₄]_n, the Cu^II atom is coordinated by two hexafluoridosilicate F atoms and four pyrazole N atoms in a distorted trans-CuF₂N₄ octa­hedral environment. The dihedral angle between the planes of the pyrazlole rings in the asymmetric unit is 74.4 (3)°. The hexa­fluoridosilicate dianion acts as a bridging ligand, connecting the Cu^II atoms into a [1-10] chain. The Cu and Si atoms lie on special positions with 2/m site symmetry. In the crystal, intra­chain N—H...F hydrogen bonds occur and weak C—H...F inter­actions link the chains.

1-Meth­oxy-4-({[(4-meth­oxy­phen­yl)­sulfan­yl](phen­yl)meth­yl}sulfan­yl)benzene

The title compound, C₂₁H₂₀O₂S₂, forms a propeller-shaped structure with the tetra­hedral C atom as the central hub and meth­oxy­benzene and phenyl residues as radiating blades. Short C—H...π contacts are observed.

Diethyl 2,2′-bis­(hy­droxy­imino)-3,3′-(hydrazinediyl­idene)dibutano­ate

Each mol­ecule of the title compound, C₁₂H₁₈N₄O₆, is located on an inversion centre at the mid-point of the central N—N bond. The azo groups C=N of the Schiff base group have an E conformation and the azo groups in the oxime C=N—O groups have a Z conformation. O–H...O hydrogen bonds link neighbouring mol­ecules into infinite monolayers perpendicular to the a axis.

6,6-Dimethyl-2H,5H,6H,7H-1,3-dithiolo[4,5-f][1,5,3]dithia­silepin-2-one

In the structure of the title compound, C₇H₁₀OS₄Si, the carbonyl O atom lies in the plane of the five-membered dithiole ring with a deviation of only 0.022 (2) Å. The seven-membered ring adopts a chair conformation. The crystal packing is stabilized by S...O [3.096 (4) Å] and S...S [3.620 (4) Å] contacts, together with C—H...S inter­actions.

Cinnarizinium picrate

In the title salt {systematic name: 4-diphenyl­methyl-1-[(E)-3-phenyl­prop-2-en-1-yl]piperazin-1-ium 2,4,6-trinitro­pheno­late), C₂₆H₂₉N₂⁺·C₆H₂N₃O₇⁻, the cinnarizinium cation is protonated at the piperazine N atom connected to the styrenylmethyl group; the piperazine ring adopts a distorted chair conformaiton. In the crystal, bifurcated N—H...(O,O) hydrogen bonds link the components into two-ion aggregates.

1-(Phenyl­sulfon­yl)naphthalene

In the title compound, C₁₆H₁₂O₂S, the phenyl ring is nearly perpendicular to the naphthalene system [dihedral angle = 80.3 (1)°]. The packing is consolidated by a weak C—H...π inter­action involving neighbouring naphthalene and benzene rings. In addition, there exist two different offset π–π stacking inter­actions between benzene rings and between naphthalene systems of symmetry-related mol­ecules [centroid–centroid distances = 3.876 (9) and 3.566 (4) Å, and slippage = 1.412 and 0.554 Å, respectively.

4-[(4-Chloro­phen­yl)(phen­yl)­meth­yl]­piperazin-1-ium picrate monohydrate

The asymmetric unit of the title compound, C₁₇H₂₀ClN₂⁺·C₆H₂N₃O₇⁻·H₂O, contains a piperazin-1-ium cation, a picrate anion and one solvent water mol­ecule. The piperazene ring is protonated at one N atom and adopts a highly distorted chair conformation with the chloro­pheny(phen­yl)methyl substituent on the second N atom in an equatorial position. The crystal structure is stabilized by O—H...O, N—H...O and C—H...O hydrogen bonds.

1-[(4-Chloro­phen­yl)(phen­yl)meth­yl]piperazine-1,4-diium bis­(trichloro­acetate)–trichloro­acetic acid (1/1)

In the title salt adduct, C₁₇H₂₁ClN₂²⁺·2C₂Cl₃O₂⁻·C₂HCl₃O₂, the Cl atom of the dication is disordered over two positions in a 0.915 (3):0.085 (3) ratio. The Cl atoms in the trichloroacetate anions and trichloroacetic acid molecule are also disordered, with refined site-occupation factors of 0.59 (3):0.41 (3), 0.503 (12):0.417 (12) and 0.653 (12):0.347 (12). The piperazine ring adopts a chair conformation, with puckering parameters Q_T = 0.587 (3) Å, θ = 2.6 (2) and Φ 334 (6)°. In the crystal, neighbouring mol­ecules are linked by N—H...O, O—H...O, N—H...Cl, C—H...O and C—H...Cl hydrogen bonds, forming a three-dimensional network.

Ortho­rhom­bic polymorph of (2E)-2-(2,3-dihydro-1H-inden-1-yl­idene)-2,3-di­hydro-1H-inden-1-one

The title compound, C₁₈H₁₄O, is polymorphic at 123 K. The ortho­rhom­bic form reported herein has two independent mol­ecules in the asymmetric unit, with mol­ecular volume 313.5 ų. The previously reported triclinic (P-1) form [Raston & Scott (2000). Green Chem., 2, 49–52] has mol­ecular volume 309.6 ų at the same temperature. All three mol­ecules deviate significantly and systematically from the putative C_s symmetry (δ_r.m.s. = 0.0265, 0.0256, 0.0497 Å). Comparison of the two molecules in the orthorhombic polymorph shows that 16 of the 19 equivalent pairs of framework atoms have a mirror-image pattern of deviations (above/below plane), suggesting that the two are quasi-enanti­omorphs. The pattern of deviations in the triclinic form is nearly the same (13 of 19 atom pairs) as the ortho­rhom­bic form.