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In the title mol­ecule, C9H6BrNS, the planes of the 2-bromo-1,3-thia­zole and phenyl rings are inclined at 7.45 (10)° with respect to each other. In the crystal, mol­ecules related by a centre of symmetry are held together via π–π inter­actions, with a short distance of 3.815 (2) Å between the centroids of the five- and six-membered rings. The crystal packing exhibits short inter­molecular S...Br contacts of 3.5402 (6) Å.

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In the title mol­ecule, C15H9N3O2S, the central imidazo[2,1-b][1,3]benzo­thia­zole heterotricyclic unit is essentially planar (r.m.s. deviation = 0.021 Å). The terminal phenyl ring and nitro group are twisted by 9.06 (1) and 11.02 (4)°, respectively, from the mean plane of the heterotricycle. In the crystal, mol­ecules are linked by π–π stacking inter­actions into columns along [100]; the inter­planar distance between neighboring imidazo[2,1-b][1,3]benzo­thia­zole planes within the columns is 3.370 (2) Å. Furthermore, the columns interact with each other by secondary S...O [2.9922 (10) and 3.1988 (11) Å] inter­actions, forming a three-dimensional framework.

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In the title mol­ecule, C16H15BrN2S2, the central imidazo[2,1-b]thia­zole fragment is almost planar (r.m.s. deviation = 0.012 Å), and the fused 5,6,7,8-tetra­hydro­benzene ring adopts an unsymmetrical half-chair conformation. The dihedral angle between the imidazo[2,1-b]thia­zole and benzene planes is 18.25 (4)°. The terminal methyl­sulfanyl substituent lies practically within the benzene plane [the dihedral angle between the corresponding planes is 7.20 (10)°] and is turned toward the C—Br bond. In the crystal, mol­ecules form infinite chains along [100] via secondary Br...N inter­actions [3.1861 (16) Å]. The chains are arranged at van der Waals distances.
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