(2E)-2-(5-Bromo-2-hy­droxy-3-meth­oxy­benzyl­idene)-N-cyclo­hexyl­hydrazine­carbothio­amide

The title compound, C₁₅H₂₀BrN₃O₂S, crystallizes in the thio­amide form and adopts an E,E conformation with respect to the azomethine and hydrazinic bonds, respectively. The mol­ecules are paired through N—H...O and O—H...S hydrogen bonds, leading to the formation of centrosymmetric dimers in the crystal. These dimers are stacked along the a axis and are inter­connected through N—H...S hydrogen bonds to generate polymeric chains. The structure also features C—H...π interactions. An intra­molecular O—H...O bond is also present.

Bis(1-phenyl-3-{(Z)-[phen­yl(pyridin-2-yl)methyl­idene]amino-κ²N,N′}urea-κO)nickel(II) dinitrate

The Ni^II atom in the title salt, [Ni(C₁₉H₁₆N₄O)₂](NO₃)₂, is N,N′,O-chelated by two neutral Schiff base ligands in a distorted octa­hedral geometry. One nitrate ion inter­acts with the metal atom indirectly, in an outer-sphere type of coordination, through N—H...O hydrogen bonds; the other nitrate ion does not engage in any inter­actions and is equally disordered over two positions in the crystal.

Di-μ-acetato-κ⁴O:O-bis­({N′-[(E)-phen­yl­(pyridin-2-yl-κN)methyl­idene]benzo­hydrazidato-κ²N′,O}copper(II))

The binuclear molecule of the title compound, [Cu₂(C₁₉H₁₄N₃O)₂(CH₃COO)₂], resides on a crystallographic inversion centre. It has an E conformation with respect to the azomethine double bond and a Z conformation about the amide C=N bond. The Cu^II atom has a slightly distorted square-pyramidal coordination geometry. The crystal packing involves inter­molecular C—H...O, C—H...N and C—H...π and two types of π–π inter­actions, with centroid–centroid distances of 3.9958 (10) and 3.7016 (13) Å.

(Anilino{(Z)-2-[(E)-5-bromo-3-meth­oxy-2-oxidobenzyl­idene]hydrazin-1-yl­idene-κ²O²,N²}methane­thiol­ato-κS)(4,4′-di­methyl-2,2′-bipyridine-κ²N,N′)zinc N,N-dimethyl­formamide monosolvate

The asymmetric unit of the title compound, [Zn(C₁₅H₁₂BrN₃O₂S)(C₁₂H₁₂N₂)]·C₃H₇NO, contains two independent mol­ecules with a similar structure. The doubly deprotonated Schiff base ligand O,N,S-chelates to the metal atom, and the three coordinating atoms along with one N atom of the substituted 2,2′-bipyridine ligand constitute the square plane of the distorted square pyramid surrounding the metal atom. The apical site is occupied by the second N atom of the substituted 2,2′-bipyridine. The secondary amine group of the Schiff base dianion forms a hydrogen bond to the O atom of the dimethyl­formamide solvent. In the crystal, the phenyl ring of one of the two Schiff base anions is disordered over two positions in a 1:1 ratio. The crystal studied is a racemic twin.

(2E)-2-[(2-Hy­droxy-4-meth­oxy­phen­yl)(phen­yl)methyl­idene]-N-phenyl­hydrazinecarboxamide dimethyl­formamide monosolvate

The title compound, C₂₁H₁₉N₃O₃·C₃H₇NO, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. The dihedral angle between the rings lined to the C=N bond is 88.60 (12)°. The dimethyl­formamide solvent mol­ecule is disordered over two orientations with site occupancies of 0.684 (3) and 0.316 (3). The two N atoms of the hydrazinecarboxamide group are involved in inter­molecular N—H...O hydrogen bonds in which the dimethyl­formamide O atom acts as acceptor. The structure also features π–π inter­actions, with a centroid–centroid distance of 3.6561 (13) Å. Classical and non-classical intra­molecular O—H...N and C—H...O hydrogen bonds are also present.

(2E)-2-(5-Bromo-2-hy­droxy-3-meth­oxy­benzyl­idene)-N-phenyl­hydrazine­carbo­thio­amide

The title compound, C₁₅H₁₄BrN₃O₂S, adopts an E,E conformation with respect to the azomethine and hydrazinic bonds and exists in the thio­amide form. The two rings in the mol­ecule are twisted away from each other, making a dihedral angle of 69.13 (13)°. In the crystal, mol­ecules are linked through pairs of N—H...O and O—H...S hydrogen bonds, leading to the formation of inversion dimers which are stacked along the a axis. Intra­molecular N—H...N, O—H...O and C—H...π inter­actions are also present.

2-Eth­oxy-6-({2-[(3-eth­oxy-2-hy­droxy­benzyl­idene)amino]­benz­yl}imino­meth­yl)phenol

The title compound, C₂₅H₂₆N₂O₄, exists in an E conformation with respect to each azomethine link. The two phenol-substituted benzene rings are twisted away from the plane of the diimine benzene ring by dihedral angles of 27.25 (5) and 56.67 (5)°. The mol­ecular structure is stabilized by intra­molecular O—H...N hydrogen bonds.

(2E)-2-[1-(2-Hy­droxy-4-meth­oxy­phenyl)ethyl­idene]-N-phenyl­hydrazine­carbox­amide monohydrate

The title compound, C₁₆H₁₇N₃O₃·H₂O, exists in the E conformation with respect to the azomethine C=N double bond. While the phenyl ring is almost coplanar with the central hydrazinecarboxamide group [dihedral angle = 14.18 (11)°], it is twisted slightly with respect to the other aromatic ring in the mol­ecule, with a dihedral angle of 22.88 (13)°. The packing is dominated by O—H...O, N—H...O and C—H...O hydrogen-bond inter­actions, forming a three-dimensional supra­molecular structure which is augmented by two types of C—H...π inter­actions. An intramolecular O—H...N interaction is also present in the molecule.