Bis[μ-4-(2-oxidobenzyl­idene)thio­semi­carbazidato-κ⁴S,N¹,O:O]bis­[(pyridine-κN)zinc]

In the title compound, [Zn₂(C₈H₇N₃OS)₂(C₅H₅N)₂], the Zn₂O₂ ring has a flattened roof shape, with the roof angle equal to 10.10 (6)°. The thio­semicarbazones act as tridentate ligands to one Zn^II atom, with the O atoms additionally in bridging positions to the second Zn^II atom. Both Zn^II atoms are five-coordinated; the coordination polyhedra are close to square pyramids, with the pyridine N atoms at apical positions. Two inter­molecular N—H...N and one relatively weak N—H...S hydrogen bond, together with C—H...S weak inter­actions, connect the mol­ecules into a three-dimensional network.

Tramadolium picrate

In the title salt {systematic name: [2-hy­droxy-3-(3-meth­oxy­phen­yl)cyclo­hexyl­meth­yl]dimethyl­aza­nium 2,4,6-trinitro­phenol­ate}, C₁₆H₂₆NO₂⁺·C₆H₂N₃O₇⁻, the cation is protonated at the N atom. The cyclo­hexane ring adopts a chair conformation with the hy­droxy substituent in an axial position. In the crystal, O—H...O and N—H...O hydrogen bonds link the cations and anions into supra­molecular chains along [100].

Ethyl N-(2-benzoyl-4-chloro­phen­yl)­ethane­carboximidate

In the title compound, C₁₇H₁₆ClNO₂, the N=C—O—C—C fragment is planar within 0.029 (1) Å, and makes dihedral angles of 66.71 (8) and 59.61 (8)° with the planes of the chloro­phenyl and benzoyl rings, respectively. The carbonyl C=O bond is not coplanar with either of the aromatic rings; it makes angles of 42.5 and 23.5° with the normals to the ring planes. In the crystal, very weak C—H...O, C—H...Cl, C—H...π and π–π [inter­planar distance = 3.53 (1) Å] inter­actions are observed.

(R)-Doxylaminium (R,R)-tartrate

In the title compound (systematic name: (R)-dimeth­yl{2-[1-phenyl-1-(pyridin-2-yl)eth­oxy]eth­yl}aza­nium (R,R)-3-carb­oxy-2,3-dihy­droxy­propano­ate), C₁₇H₂₃N₂O⁺·C₄H₅O₆⁻, the doxylaminium cation is protonated at the N atom. The tartrate monoanions are linked by short, almost linear O—H...O hydrogen bonds into chains extended along [100]. These chains are inter­linked by anion–pyridine O—H...N hydrogen bonds into a two-dimensional grid structure. WeakC—H...O inter­actions also play a role in the crystal packing. An intra­molecular hy­droxy–carboxyl­ate O—H...O hydrogen bond influences the conformation of the anion: the hydrogen-bonded fragment is almost planar, the maximum deviation from the mean plane being 0.059 (14) Å. In the cation, the aromatic rings are almost perpendicular [dihedral angle = 84.94 (8)°] and the conformation of the O—C—C—N chain is gauche(−), the dihedral angle is −76.6 (2)°. The absolute configuration was assigned on the basis of known chirality of the parent compound.

{4,4′,6,6′-Tetrachloro-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato}dioxidomolyb­denum(VI)

The asymmetric unit of the title compound, [Mo(C₁₉H₁₆Cl₄N₂O₂)O₂], comprises two independent mol­ecules (A and B). The geometry around the Mo^VI atom is distorted octa­hedral in each complex mol­ecule, supported by two oxide O atoms and the N₂O₂ donor atoms of the coordinating ligand. The dihedral angle between the benzene rings is 74.96 (11) Å for mol­ecule A and 76.05 (11) Å for mol­ecule B. In the crystal, the B mol­ecules are linked by pairs of C—H...Cl hydrogen bonds, forming inversion dimers. The crystal structure is further stabilized by C—H...π inter­actions. An inter­esting feature of the crystal structure is a Cl...Cl contact [3.3748 (18) Å], which is shorter than the sum of the van der Waals radii of Cl atoms (3.50 Å).

4-[(4-Benzyl­oxybenzyl­idene)amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

In the title mol­ecule, C₂₅H₂₃N₃O₂, two terminal phenyl rings are twisted by 50.20 (6) and 71.26 (5)° from the mean plane (r.m.s. deviation = 0.032 Å) of the central benzyl­idene–amino–pyrazolone fragment. The N atoms of the pyrazole ring have a pyramidal environment, the sums of the valence angles around them being 353.5 (2) and 347.3 (2)°. The crystal structure is stabilized by C—H...O interactions.

4-Phenyl-1H-imidazole-2(3H)-thione

In the asymmetric unit of the title compound, C₉H₈N₂S, there are four symmetry-independent mol­ecules (Z′ = 4). The geometrical features of these mol­ecules are quite similar: in the normal probability plots the R² correlation factors for bond lengths and angles are generally around 0.95. The twist angles between the imidazole and phenyl rings (which are planar within 3σ) range from 9.0 (6) to 13.1 (5)°. In the crystal, pairs of independent molecules are joined by linear N—H...S and weak C—H...S hydrogen bonds, forming infinite ribbons, of the type ∼ABABAB∼ and ∼CDCDCD∼, propagating along [110]. Second-order hydrogen-bonded R₂²(8) rings are formed via inter­weaving infinite C₂²(8) chains.

1-[Bis(4-fluoro­phen­yl)meth­yl]piperazine

In the title mol­ecule, C₁₇H₁₈F₂N₂, the dihedral angle between the benzene rings is 73.40 (3)°. The piperazine ring is close to an ideal chair conformation and the N—H hydrogen is in an equatorial position. In the crystal, molecules are linked via weak C—H...F hydrogen bonds.

2-(4-Methyl­phen­yl)-2-oxoethyl 3-bromo­benzoate

The mol­ecule of the title compound, C₁₆H₁₃BrO₃, is built of two approximately planar fragments, viz. 3-bromo­benzoate [maximum deviation = 0.055 (2) Å and 2-oxo-2-p-tolyl­ethyl [maximum deviation = 0.042 (2) Å], inclined by 46.51 (7)°. In the crystal, weak C—H...O hydrogen bonds and Br...Br contacts [3.6491 (7) Å] connect the mol­ecules into infinite layers parallel to (-221).