Bis{μ-2-[bis­(pyridin-2-yl)methyl­idene]hydrazinecarbothio­amidato}bis­[bromido­copper(II)] methanol disolvate

In the centrosymmetric binuclear title compound, [Cu₂Br₂(C₁₂H₁₀N₅S)₂]·2CH₃OH, the Cu^II ion adopts a slightly dis­torted square-pyramidal coordination geometry. The hydrazine carbothio­amide moiety and one of the pyridyl rings together adopt an almost planar arrangement, with a maximum deviation of 0.052 (4) Å for the C atom of the thio­urea moiety. There are two mol­ecules of methanol solvent per complex in the asymmetric unit. The nonconventional intra­molecular C—H...Br hydrogen bonds make the mol­ecule more rigid, whereas the conventional N—H...N and O—H...Br inter­molecular hydrogen-bonding inter­actions, supported with N—H...π inter­actions, establish a supra­molecular linkage among the mol­ecules in the crystal. An intermolecular C—H...O inter­action is also present.

(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.

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.

N′-[(E)-4-Benz­yloxy-2-hy­droxy­benzyl­idene]-4-nitro­benzohydrazide monohydrate

The title compound, C₂₁H₁₇N₃O₅·H₂O, exists in the keto form with an E conformation with respect to the azomethine double bond. The twist angles between the aromatic rings are in the range 4.67 (10)–17.54 (10)°. A water mol­ecule of solvation is present in the lattice. A conventional intra­molecular O—H...N hydrogen bond increases the rigidity of the mol­ecule. Inter­molecular O—H...O, N—H...O and C—H...O hydrogen-bonding inter­actions establish a supra­molecular linkage among the mol­ecules in the crystal structure. There are also C—H...π inter­actions present.

(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.

N′-[(E)-(3-Fluoro­pyridin-2-yl)methyl­idene]benzohydrazide monohydrate

The title compound, C₁₃H₁₀FN₃O·H₂O, exists in the E conformation with respect to the azomethane C=N double bond. The mol­ecule is close to planar with a maximum deviation of 0.286 (2) Å. The pyridine ring is essentially coplanar with the central C(= O)N₂C unit [dihedral angle = 2.02 (3)°] and the phenyl ring exhibits a dihedral angle of 14.41 (10)° with respect to the central unit. The crystal structure features O—H...N, N—H...O and O—H...O hydrogen-bond inter­actions between the solvent water and the benzohydrazide mol­ecules, as well as C—H...O hydrogen bonds and C—F...π [3.0833 (18) Å] inter­actions.

N′-[(E)-4-Benz­yloxy-2-hy­droxy­benzyl­idene]benzohydrazide

The title compound, C₂₁H₁₈N₂O₃, exists in the E conformation with respect to the azomethane C=N double bond. The central benzene ring is almost coplanar with one of the substituent benzene rings [dihedral angle = 1.74 (5)°] and is approximately orthogonal to the other benzene ring of the mol­ecule [dihedral angle = 86.61 (7)°]. An intra­molecular O—H...N hydrogen bond occurs. The crystal packing is dominated by N—H...O hydrogen bonds, which lead to an infinite chain running parallel to [010].

N′-[(E)-5-Bromo-2-hy­droxy-3-meth­oxy­benzyl­idene]-4-meth­oxy­benzohydrazide monohydrate

In the title compound, C₁₆H₁₅BrN₂O₄·H₂O, the hydrazide mol­ecule is nearly planar, with a largest deviation from the mean plane through the non-H atoms of 0.106 (4) Å and a dihedral angle between the benzene rings of 1.98 (16)°. This mol­ecule adopts an E conformation about the C=N bond and an intra­molecular O—H...N hydrogen bond increases the rigidity. In the crystal, some mol­ecules of the title hydrazide are replaced by mol­ecules of its 6-bromo isomer, and the Br atom from this admixture mol­ecule was refined to give a partial occupancy of 0.0523 (13). The hydrazide and water mol­ecules are linked through classical N—H...O and O—H...O hydrogen bonds, forming layers parallel to (110). C—H...π inter­actions are also present.

(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.