1-(2,4-Difluoro­phen­yl)-2-(1H-1,2,4-triazol-1-yl)ethanol

In the title compound, C₁₀H₉F₂N₃O, the dihedral angle between the mean planes of the triazole and benzene rings is 20.6 (2)°. In the crystal, mol­ecules are linked by strong O—H... N hydrogen bonds into chains with graph-set notation C(9) along [100]. Weak C—H...N and C—H...F inter­actions are also observed.

2-Amino-N′-phenyl­benzohydrazide

In the title compound, C₁₃H₁₃N₃O, the NNCO unit forms dihedral angles of 35.8 (1) and 84.0 (1)° with the benzene and phenyl rings, respectively. The dihedral angles between the aromatic rings is 61.2 (1)°. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, mol­ecules are linked by weak N—H...O hydrogen bonds into C(4) chains parallel to the c axis. Neighbouring chains are linked by weak N—H...N hydrogen bonds, forming R⁴₄(20) rings, and resulting in the formation of a two-dimensional network lying parallel to (010). The packing also features π–π stacking inter­actions between phenyl rings [centroid–centroid distance = 3.803 (2) Å].

2-(4-Bromo­phen­yl)-N-[3-(1H-imidazol-1-yl)prop­yl]quinazolin-4-amine

In the title compound, C₂₀H₁₈BrN₅, the bromo­phenyl-substituted quinazoline unit is essentially planar [maximum deviation = 0.098 (3) Å] and makes a dihedral angle of 56.04 (14)° with the imidazole ring. In the crystal, mol­ecules are associated by pairs of N—H...N hydrogen bonds to form inversion dimers. All the quinazoline planar systems are oriented almost perpendicular to the [110] direction, making π–π inter­actions possible between adjacent dimers [centroid–centroid distances = 3.7674 (16) and 3.7612 (17) Å]. There are also a number of C—H...π inter­actions present. The crystal is a nonmerohedral twin, with a minor twin fraction of 0.47.