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In the title compound, C21H26N2O4, there is half a molecule in the asymmetric unit with a crystallographic twofold rotation axis passing through the central C atom of the –CH=N—O—(CH2)5—O—N=CH– bridge. The dihedral angle formed by the two benzene rings is 80.85 (2)°. Strong intramolecular O—H...N and C—H...O hydrogen bonds help to establish the molecular conformation. There are also weak intermolecular π–π stacking interactions between neighbouring benzene rings [centroid–centroid separation = 3.502 (3) Å].

The molecule of the centrosymmetric title compound, C18H20N2O6, assumes an E configuration with respect to the azomethine C=N bond. The imino group is coplanar with the aromatic ring. Intramolecular O—H...O and O—H...N bonds are found between the hydroxyl groups and adjacent O (or N) atoms. In the crystal structure, intermolecular O—H...O bonds link each molecule to two others, forming a layered network.

The molecule of the title compound, C22H28N2O2, lies across an inversion centre with one half-molecule in the asymmetric unit. The molecule adopts an E configuration with respect to the azomethine C=N bond and the imino group is coplanar with the aromatic ring. Within the molecule, the planar units are parallel, but extend in opposite directions from the hexamethylene bridge. There are intramolecular O—H...N hydrogen bonds between the hydroxyl groups and the oxime N atoms. There are also weak intermolecular C—H...O bonds that link each molecule to two others, forming chains along the a axis.

The molecule of the title compound, C17H18N2O6, adopts a V-shaped conformation, the dihedral angle between the two halves of the molecule being 81.31 (4) °. There is one half-molecule in the asymmetric unit, with a crystallographic twofold rotation axis passing through the central C atom. There are strong intramolecular O—H...N and O—H...O hydrogen bonds involving the hydroxy group and adjacent O and N atoms. In the crystal structure, intermolecular O—H...O hydrogen bonds link the molecules, forming an infinite three-dimensional supramolecular structure.

The molecule of the title compound, C18H18Cl2N2O2, lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine C=N bond. The imino group is coplanar with the aromatic ring. Within the molecule, the planar units are parallel, but extend in opposite directions from the dimethylene bridge. In the crystal structure, the title compound exhibits a layer packing structure via weak π–π stacking interactions [intermolecular plane-to-plane distances between adjacent aromatic rings are 3.461 (3) Å]. Molecules in each layer are linked by intermolecular C—H...O hydrogen-bonding interactions.

The title compound, C28H28N2O2, was synthesized by condensation of 1-naphthaldehyde with 1,6-bis(aminooxy)hexane in ethanol. The molecule is disposed about a crystallographic centre of symmetry. In the crystal structure, molecules are linked through strong intermolecular π–π stacking interactions [interplana distance = 2.986 (2) Å], forming a three-dimensional network.

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.

The molecule of the title compound, C19H22N2O6, assumes a W-shaped configuration with the dihedral angle between the two halves of the molecule being 82.48 (5)°. There is one half-molecule in the asymmetric unit with a crystallographic twofold rotation axis passing through the central C atom of the five methylene groups in the [—CH=N—O—(CH2)5—O—N=CH—] bridge. The dihedral angle formed by the two benzene rings in each molecule of the title compound is 84.18 (4)°. There are strong intramolecular O—H...N and O—H...O hydrogen bonds and weak intermolecular π–π stacking interactions between neighbouring benzene rings, and the intermolecular plane-to-plane distances are 3.488 (2) and 3.841 (3) Å along the b and c axes, respectively. In the crystal structure, intermolecular O—H...O hydrogen bonds link each molecule to two others, forming an infinite three-dimensional supramolecular structure.

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.

The mol-ecule of the title compound, C(19)H(22)N(2)O(6), assumes a W-shaped configuration with the dihedral angle between the two halves of the mol-ecule being 82.48 (5)°. There is one half-mol-ecule in the asymmetric unit with a crystallographic twofold rotation axis passing through the central C atom of the five methylene groups in the [-CH=N-O-(CH(2))(5)-O-N=CH-] bridge. The dihedral angle formed by the two benzene rings in each mol-ecule of the title compound is 84.18 (4)°. There are strong intra-molecular O-H⋯N and O-H⋯O hydrogen bonds and weak inter-molecular π-π stacking inter-actions between neighbouring benzene rings, and the inter-molecular plane-to-plane distances are 3.488 (2) and 3.841 (3) Å along the b and c axes, respectively. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link each mol-ecule to two others, forming an infinite three-dimensional supra-molecular structure.

The title compound, C(19)H(22)N(2)O(4), was synthesized by the reaction of 2'-hydroxy-acetophenone with 1,3-bis-(amino-oxy)propane in ethanol. Intra-molecular O-H⋯N and weak C-H⋯O hydrogen bonds stabilize the three-dimensional structure. A twofold rotation axis passes through the molecule.