Bis{(E)-2-[(2-chloro-3-pyrid­yl)imino­meth­yl]-6-meth­oxy­phenolato-κ2 N,O 1}copper(II)

In the title mononuclear copper(II) complex, [Cu(C13H10ClN2O2)2], the CuII ion, lying on an inversion center, is four-coordinated in a trans-CuN2O2 square-planar geometry by two phenolate O and two imino N atoms from two symmetry-related N,O-bidentate Schiff base ligands. The shortest Cu⋯Cu distance is 7.5743 (9) Å. However, there are weak intra­molecular electrostatic inter­actions between the Cu atom and the Cl atom of the ligand, with a Cu⋯Cl distance of 3.3845 (9) Å

2,2′-[1,1′-(Propane-1,3-diyldioxy­dinitrilo)diethyl­idyne]diphenol

The title compound, C19H22N2O4, was synthesized by the reaction of 2′-hydroxy­acetophenone with 1,3-bis­(amino­oxy)propane in ethanol. Intra­molecular O—H⋯N and weak C—H⋯O hydrogen bonds stabilize the three-dimensional structure. A twofold rotation axis passes through the molecule

2,2′-Dichloro-1,1′-[(propane-1,3-diyldi­oxy)bis­(nitrilo­methyl­idyne)]dibenzene

The title compound, C17H16Cl2N2O2, assumes a V-shape configuration with a dihedral angle between the two halves of the mol­ecule of 79.60 (4)°. The asymmetric unit comprises one half-mol­ecule with a crystallographic twofold rotation axis passing through the central C atom. There are weak inter­molecular π–π stacking inter­actions between neighbouring benzene rings with inter­molecular plane-to-plane distances of 3.277 (6) and 3.465 (5) Å along the a and c axes, respectively. In the crystal structure, weak inter­molecular C—H⋯O bonds link each mol­ecule to four others to form an infinite three-dimensional network

2,2′-[1,1′-(Propane-1,3-diyldioxy­dinitrilo)diethyl­idyne]di-1-naphthol

The mol­ecule of the title compound, C27H26N2O4, lies across a crystallographic inversion centre and adopts an l-shaped configuration. Within the mol­ecule, the two naphthalene units are approximately perpendicular, making a dihedral angle of 80.24 (5)°. The two intramolecular O—H⋯N hydrogen bonds, generate S(6) ring motifs. In the crystal structure, every mol­ecule links five other mol­ecules into an infinite cross-linked layered supra­molecular structure via inter­molecular C—H⋯O hydrogen bonds, C—H⋯π inter­actions and π–π stacking inter­actions [centroid–centroid distance = 3.956 (4) Å]

Bis{(E)-2-[1-(eth­oxy­imino)­eth­yl]-1-naphtho­lato-κ2 N,O 1}copper(II)

In the title complex, [Cu(C14H14NO2)2], the discrete complex mol­ecules have crystallographic inversion symmetry. The slightly distorted square-planar coordination sphere of the CuII atom comprises two phenolate O atoms and two oxime N atoms from two bidentate–chelate 2-[1-(eth­oxy­imino)­eth­yl]-1-naphtho­late O-ethyl oxime (L −) ligands [Cu—O = 1.8919 (17) Å and Cu—N = 1.988 (2) Å]. The two naphthalene ring systems in the mol­ecule are parallel, with a perpendicular inter­planar spacing of 1.473 (2) Å, while each complex unit forms links to four other mol­ecules via inter­molecular methyl C—H⋯π inter­actions, giving an infinite cross-linked layered supra­molecular structur

6,6′-Dimeth­oxy-2,2′-[(hexane-1,6-diyldi­oxy)bis­(nitrilo­methyl­idyne)]diphenol

In the title compound, C22H28N2O6, strong intra­molecular O—H⋯N hydrogen bonds and weak inter­molecular C—H⋯O hydrogen bonds stabilize the three-dimensional supra­molecular structure

Bis{(E)-4-bromo-2-[(2-chloro-3-pyrid­yl)imino­meth­yl]phenolato-κ2 N,O}copper(II)

In the title complex, [Cu(C12H7BrClN2O)2], the CuII center is tetra­coordinated by two phenolate O and two azomethine N atoms from two independent bidentate 4-bromo-2-[(2-chloro-3-pyrid­yl)imino­meth­yl]phenolate (L) ligands. In the crystal structure, the CuII atom has a distorted square-planar coordination environment. The inter­planar dihedral angles between the benzene and pyridine rings in the individual ligands are 63.83 (4) and 54.43 (3)°, indicating the pyridine ring to have considerably weaker steric hindrance

5,5′-Bis(diethyl­amino)-2,2′-[butane-1,4-diyldioxy­bis(nitrilo­methyl­idyne)]­diphenol

The title complex, C26H38N4O4, was synthesized by the reaction of 4-diethyl­amino-2-hydroxy­benzaldehyde with 1,4-bis­(amino­oxy)butane in ethanol. It crystallizes as discrete centrosymmetric molecules adopting an extended conformation where the two salicylaldoxime groups are separated from each other. Intra­molecular O—H⋯N hydrogen bonding is observed between the hydr­oxy groups and oxime N atoms. Inter­molecular π–π stacking inter­actions [3.979 (2) Å] between aromatic rings are apparent in the crystal structure. Each ethyl group is disordered over two positions; in one the site occupancy factors are 0.55 and 0.45, in the other 0.53 and 0.47

4-[1-(Hydroxy­imino)ethyl]-N-(4-nitro­benzyl­idene)aniline

In the title compound, C15H13N3O3, the dihedral angle formed by the two benzene rings is 44.23 (2)°. The crystal structure is stabilized by aromatic π–π stacking inter­actions, with centroid-centroid distances of 3.825 (3) and 3.870 (4) Å between the aniline and the nitro­benzene rings of neighbouring mol­ecules, respectively. In addition, the stacked mol­ecules exhibit inter­molecular C—H⋯N and C—H⋯O inter­actions

4,4′-Dimethyl-1,1′-[ethyl­enedioxy­bis(nitrilo­methyl­idyne)]dibenzene

The Schiff base, C18H20N2O2, which lies about an inversion centre, adopts a linear conformation. The mol­ecules are packed by C—H⋯π inter­actions, forming a two-dimensional supra­molecular network