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The title compound, C12H13N3OS, was synthesized via the Willgerodt–Kindler method. The benzimidozole moiety is essentially planar (r.m.s. deviation = 0.0084 Å). The thioamide group is inclined by 54.80 (14)° to the benzimidazole ring system. The morpholine ring is disordered over two sets of sites [ratio 0.841 (11):0.159 (11)], with chair conformations for both components. In the crystal, molecules are linked into N—H...N hydrogen-bonded chains running parallel to the c axis. Hirshfeld surface analysis was used to quantify the intermolecular interactions.

The asymmetric unit of the title compound, C16H13N3OS, comprises two molecules (A and B) with similar conformations that differ mainly in the orientation of the phenyl group relative to the rest of the molecule, as expressed by the Cthioamide—Nthioamide—Cphenyl—Cphenyl torsion angle of 49.3 (3)° for molecule A and of 5.4 (3)° for molecule B. In the crystal, two intermolecular N—H...N hydrogen bonds lead to the formation of a dimer with R22(10) graph-set notation. A Hirshfeld surface analysis revealed that H...H interactions are the most important intermolecular interactions, contributing 40.9% to the Hirshfeld surface.

The title compound, (C12H15N2)2[ZnCl4], is a salt with two symmetrically independent, essentially planar heterocyclic cations and a slightly distorted tetrahedral chlorozincate dianion. N—H...Cl hydrogen bonds link these ionic constituents into a discrete aggregate, which comprises one formula unit. The effect of hydrogen bonding is reflected in the minor distortions of the [ZnCl4]2− moiety: distances between the cation and chlorido ligands engaged in classical hydrogen bonds are significantly longer than the others. Secondary interactions comprise C—H...π hydrogen bonding and weak π–π stacking. A Hirshfeld surface analysis indicates that the most abundant contacts in packing stem from H...H (47.8%) and Cl...H/H...Cl (29.3%) interactions.

A quinazolinthione, C17H14N2OS, was synthesized by the condensation reaction of 6,7,8,9-tetrahydro-11H-pyrido[2,1-b]quinazolin-11-thione with furfural. The molecule crystallizes in the monoclinic system (Cc space group) and has an E configuration with respect to the exocyclic C=C bond. In the crystal, molecules are linked through C—H...π(furan) interactions, forming zigzag chains propagating along the [001] direction.

The crystal structures of 4-(3,4-dimethoxyphenylethylamino)-methylidene-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]-quinazolin-10-one (1) and 4-(3,4-methylene-dioxyphenylethylamino)-methylidene-2,3,4,10-tetrahydro-1H-pyrido[2,1-b]-quina-zolin-10-one hydrochloride (2) were studied by single crystal X-ray diffraction. Their molecular and crystal structures are described in the context of intra- and inter-molecular interactions and of stereoisomerism. The crystallographic study established mixed E, Z configuration about the C4=C12 bond for (1) and E configuration about the C4=C12 bond for (2). For molecular crystals, Hirshfeld surface analyses may provide insight into intermolecular interactions, and energy framework analyses allow one to quantify different contributions to the overall energy. These analyses were performed to pinpoint intermolecular interactions in (1) and (2). According to our results, the molecules are associated with intra- and intermolecular hydrogen bonds, C-H···π and π-stacking interactions. The three-dimensional Hirshfeld surface analyses and two-dimensional fingerprint plots revealed that the structures are dominated by H···H, H···C/C···H and H···O/O···H contacts. The intermolecular energy analysis confirmed a significant contribution of dispersion to the stabilization of molecular packings in (1) and (2).

In the molecule of the title compound, C20H16N2O5, the phthalimide fragments are almost planar, with r.m.s. deviations of 0.018 and 0.020 Å, and make a dihedral angle of 53.64 (3)°. The molecular and crystal structures are stabilized by a weak intermolecular C—H...O, C—H...π and C=O...π [2.883 (1) Å] interactions and aromatic π–π stacking interactions with a centroid–centroid distance of 3.6189 (7) Å.

In the title complex, [CuCl2(C8H6N2O)2(H2O)2], the CuII ion is located on an inversion center and is octahedrally coordinated by two N atoms of the 1H-quinazolin-4-one ligand, two chloride ligands and two aqua ligands. The axial Cu—O distances are significantly longer [2.512 (2) Å], than the Cu—N [2.022 (2) Å] and Cu—Cl [2.3232 (4) Å] distances as a result of Jahn–Teller distortion. Aqua ligands are involved in intra- and intermolecular hydrogen bonding, and N—H...O intermolecular hydrogen bonds are formed between the organic ligands. In addition, weak π–π interactions are observed between the benzene rings of the ligand [centroid–centroid distance = 3.678 (1) Å].

The asymmetric unit of the title compound, [CdCl2(C8H6N2O)2]n, consists of one molecule of the 3H-quinazolin-4-one ligand, one Cd2+ cation, which is located on a twofold axis, and one chlorido ligand in a general position. The latter bridges metal cations, forming a one-dimensional polymer along the b axis. The Cd...Cd distance along the chain is 3.7309 (7) Å. The octahedral coordination around the metal is completed by two ligands in a trans axial geometry which coordinate through the N atom in 1 position. Moderately strong classical N—H...O hydrogen bonds around crystallographic inversion centers cross-link adjacent polymeric chains.

The title compound, C15H16N2O2·H2O, was synthesized via the alkylation of 3-hydroxymethylidene-2,3-dihydro-1H-pyrrolo[2,1-b]quinazolin-9-one with n-propyl iodide in the presence of sodium hydroxide. The organic molecule and the water molecule both lie on a crystallographic mirror plane. In the crystal structure, intermolecular O—H...O and O—H...N hydrogen bonds link the components into extended chains along [100].