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-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.

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.