3-Bromo-7-meth­oxy-2-phenyl­imidazo[2,1-b][1,3]benzothia­zole

In the title mol­ecule, C₁₆H₁₁BrN₂OS, the central imidazo[2,1-b][1,3]benzothia­zole tricycle is essentially planar (r.m.s. deviation = 0.021 Å). The terminal phenyl ring is twisted at 36.18 (5)° from the mean plane of the tricycle. In the crystal, pairs of eak C—H...O hydrogen bonds link mol­ecules into centrosymmetric dimers, which are further packed into stacks along the a axis.

(E)-1,5-Di­phenyl­pent-2-en-4-yn-1-one

The title compound, C₁₇H₁₂O, has an E conformation about the C=C bond. The C—C[triple bond]C—C torsion angle is 7.7 (2)°, and the mean planes of the phenyl­ethyl­enone [r.m.s. deviation = 0.059 (1) Å] and phenyl­acetyl­ene [r.m.s. deviation = 0.023 (1) Å] fragments form a dihedral angle of 14.16 (7)°. In the crystal, weak C—H...O inter­actions link the mol­ecules into zigzag chains propagated in [010].

6-(4-Chloro­phen­yl)-3-methyl­imidazo[2,1-b]thia­zole

In the title compound, C₁₂H₉ClN₂S, the imidazo[2,1-b]thia­zole fragment is planar (r.m.s. deviation = 0.003 Å), and the benzene ring is twisted slightly [by 5.65 (6)°] relative to this moiety. In the crystal, mol­ecules are linked by π–π stacking inter­actions into columns along [010]. The mol­ecules within the columns are arranged alternatively by their planar rotation of 180°. Thus, in the columns, there are the two types of π–π stacking inter­actions, namely, (i) between two imidazo[2,1-b]thia­zole fragments [inter­planar distance = 3.351 (2) Å] and (ii) between an imidazo[2,1-b]thia­zole fragment and the phenyl ring [inter­planar distance = 3.410 (5) Å]. There are no short contacts between the columns.