1-{[Dimeth­yl(phen­yl)sil­yl]meth­yl}-3-(2-phenyl­eth­yl)-1H-benzimidazol-3-ium bromide monohydrate

The title compound, C₂₄H₂₇N₂Si⁺·Br⁻·H₂O, was synthesized from 1-(dimethyl­phenyl­silylmeth­yl)-1H-benzimidazole and (2-bromo­eth­yl)benzene in dimethyl­formamide. The benzimidazole ring system is nearly planar, with a maximum deviation of 0.015 (5) Å, and forms dihedral angles of 73.0 (3) and 39.6 (2)°, with the phenyl rings. In the crystal, mol­ecules are linked by O—H...Br, C—H...Br and C—H...O hydrogen bonds. In addition, the structure features π–π stacking inter­actions, with a face-to-face separation of 3.644 (3) Å between parallel benzimidazole ring systems.

1-[4-(4-Chloro­phen­yl)piperazin-1-yl]-3-(6-oxo-3,4-diphenyl-1,6-dihydro­pyridazin-1-yl)propan-1-one

In the title compound, C₂₉H₂₇ClN₄O₂, the six-membered ring of the pyridazine group is nearly planar [maximum deviation = −0.062 (2) Å] and its mean plane makes dihedral angles of 43.05 (9), 44.71 (10) and 72.57 (9)°, respectively, with the two phenyl and benzene rings. The piperazine ring has a chair conformation and its mean plane is almost perpendicular to the attached benzene ring, with a dihedral angle of 83.20 (16)°. In the crystal, mol­ecules are linked via two pairs of C—H...O inter­actions, which result in the formation of chains propagating along [10-1]. Neighbouring chains are linked via C—H...π inter­actions.