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In the title compound, [Cu(C12H18N2O2)]·0.25H2O, the coordination of the O,N,N′,O′-tetradentate ligand results in a cis-CuN2O2 square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex molecule is close to planar (r.m.s. deviation = 0.047 Å). The uncoordinated water molecule (O-atom site symmetry 2) was modelled as half occupied. In the crystal, C—H...Ow and Ow—H...O (w = water) hydrogen bonds link the components into layers parallel to ab plane.

In the title compound, C20H13Cl2NO, the C=N bond adopts an E conformation. The chloro-substituted rings form a dihedral angle of 11.99 (9)° with each other and form dihedral angles of 74.95 (9) and 83.26 (10)° with the unsubstituted ring. In the crystal, molecules are connected into dimers by pairs of weak C—H...O hydrogen bonds and the dimers are arranged in columns parallel to the a axis.

In the title compound, C19H18N4O3, the pyrazole ring is oriented at dihedral angles of 41.12 (7) and 12.25 (10)°, respectively, with respect to the planes of the phenyl and benzene rings. Intramolecular N—H...O and O—H...O hydrogen bonds generate seven- and six-membered S(7) and S(6) ring motifs, respectively.

There are one-and-a-half independent molecules in the asymmetric unit of the title compound, C18H20N2O4. One molecule is centrosymmetric with the mid-point of the N—N bond located on a center of inversion. In the other, which lies on a general position, the benzene rings are aligned at 21.6 (1)°. Weak intermolecular C—H...O hydrogen bonding is present in the crystal strcture.

In the title molecule, C12H15NO5, the nitrophenoxy portion is approximately planar (r.m.s. deviation = 0.034 Å) and makes an angle of 84.8 (1)° with respect to the –CH2–C(=O)–O–C fragment. In the crystal, π–π stacking is observed between nearly parallel benzene rings of adjacent molecules, the centroid–centroid distance being 3.6806 (10) Å. Weak intermolecular C—H...O hydrogen bonding is present in the crystal structure.

In the title compound, C33H36O6, two naphthalene ring systems are connected through a methylene linkage [C—C—C = 114.9 (2)°]; the ring systems are aligned at an angle of 76.5 (1)°. Of the two –O–CH2–C(=O)–C(CH3)3 substituents, one adopts an extended conformation whereas the other is U-shaped. In the crystal, molecules are linked via weak C—H...O hydrogen bonding, forming supramolecular chains running along the c axis.

The molecule of the title compound, C19H14Cl2O2, has two benzene rings connected to a methylene C atom, and the rings are aligned at 66.3 (1)°. Intermolecular C—H...π and π–π stacking interactions are observed in the crystal structure, the centroid–centroid distances between parallel benzene rings being 3.7529 (12) and 3.6201 (12) Å, respectively.

The title compound, C18H16O7·H2O, is a flavonoid isolated from Dodonaea viscosa. The benzopyran ring system of the flavonoid is essentially planar [maximum deviation = 0.025 (2) Å] and inclined at 5.83 (2)° to the attached benzene ring. The water of hydration is involved in extensive hydrogen bonding, assembling the molecules into a supramolecular network via classical intermolecular O—H...O hydrogen bonding. The crystal structure is further stabilized by π–π stacking interactions [centroid–centroid distance between benzene rings = 3.564 (3) Å].

In the title molecule, C20H26O3, a clerodane diterpenoid isolated from Dodonaea viscosa, the trans-fused six-membered rings of the decaline system display chair conformations. The five-membered lactone ring adopts an envelope conformation and the five-membered furan ring is essentially planar with a maximum deviation of 0.0052 (12) Å.

In the title compound, C20H22O6, the mean planes through the benzene rings make a dihedral angle of 59.82 (7)° with each other. Weak intermolecular C—H...O interactions together with π–π stacking interactions [centroid–centroid distance = 3.830 (1) Å] between benzene rings are observed in the crystal packing.

In the title compound, C15H12N2O2, the seven-membered ring bearing the three methylene C atoms displays a puckered conformation, with the methylene C atoms deviating from the plane of the benzene ring by 0.05 (1), 0.98 (1) and 1.04 (1) Å. The phenanthroline unit is not planar; the dihedral angles between this benzene ring and the other pyridyl rings are 9.62 (4) and 9.31 (4)°. The crystal packing is stabilized by π–π interactions between two phenanthroline ring systems, forming a centrosymmetric dimer with a centroid–centroid distance of 3.656 (1) Å.

In the title compound, C13H12N4O6, the mean plane through the nitrobenzene forms a dihedral angle of 37.38 (15)° with the plane through the imidazole ring. The crystal packing is stabilized by weak intermolecular C—H...O and C—H...N interactions together with π–π stacking interactions between nitrobenzene rings [centroid–centroid distance = 3.788 (3) Å] and between imidazole rings [centroid–centroid distance = 3.590 (2) Å].

The molecule of the title compound, C13H12BrN3O4, is non-planar, as indicated in the dihedral angle of 59.5 (4)° formed between the least-squares planes through the imidazole and benzene rings. In the crystal, molecules are connected via C—H...O contacts, forming a supramolecular chain.

The title molecule, C21H26Br2O2, is a substituted diphenylmethane derivative whose angle at the methylene carbon is 115.0 (2)°.

The three independent molecules of the title compound, C15H14O4, have similar orientations of their aromatic rings, the dihedral angles between the rings being 57.0 (1), 58.1 (1) and 58.2 (1)°. In each molecule, the hydroxy group forms an intramolecular hydrogen bond to the carbonyl O atom, forming an S(10) ring motif.