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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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The title compound, [Fe(C7H9N2)2], crystallizes with two crystallographically independent mol­ecules in the unit cell. These represent the chiral atropoisomers distinguished by the mutual arrangement of the two acet­yl–hydrazone groups with a cis conformation of the C=N bonds. The two cyclo­penta­dienyl (Cp) rings are planar and nearly parallel, the tilt between the two rings being 3.16 (16)° [4.40 (18)° for the second independent mol­ecule]. The conformation of the Cp rings is close to eclipsed, the twist angle being 0.1 (2)° [3.3 (2)°]. The two acet­yl–hydrazone substituents are also planar and are inclined at 13.99 (15)/9.17 (16)° [6.83 (17)/14.59 (15)°] relative to the Cp rings. The Fe—C bond lengths range from 2.035 (3) to 2.065 (2) Å, with an average of 2.050 (3) Å [2.036 (3) to 2.069 (2), average 2.046 (3) Å], which agrees well with those reported for most ferrocene derivatives. In the crystal, the mol­ecules form dimers via two strong N—H...N hydrogen bonds. The dimers are linked into a three-dimensional framework by weak N—H...N hydrogen bonds.

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The title compound, C10H8BrF3N2, crystallizes with two independent mol­ecules in the asymmetric unit, which can be considered as being related by a pseudo-inversion center, so their conformations are different; the corresponding N=C—N—C torsion angles are 54.6 (5) and −50.5 (5)°. In the crystal, mol­ecules related by translation in [001] inter­act through short inter­molecular Br...F contacts [3.276 (2) and 3.284 (2) Å], thus forming two types of crystallographically independent chains.

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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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The title compound, C15H14N2S, crystallizes with two independent mol­ecules in the asymmetric unit. The central imidazo[2,1-b][1,3]benzo­thia­zole unit is planar (r.m.s. deviations of 0.010 and 0.008 Å for the two independent mol­ecules). The fused tetra­hydro­hexane ring adopts a half-chair conformation. The phenyl substituent is twisted by 16.96 (13) and 22.89 (12)° relative to the central imidazo[2,1-b][1,3]benzo­thia­zole unit in the two mol­ecules. In the crystal, there are no significant intermolecular interactions present.

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The asymmetric unit of the title compound, C11H9Br2N3O, contains two crystallographically independent mol­ecules with similar geometries; the Br—C—C=O torsion angles are 1.2 (4) and −2.8 (4)°, and the benzene and triazole rings are inclined o one another by 51.90 (16) and 51.88 (16)°. The two molecules are related by a pseudo-screw 21 axis directed along [100]. In the crystal, mol­ecules are linked into a three-dimensional network by weak C—H...O and C—H...N hydrogen bonds and secondary Br...Br [3.5991 (8) and 3.6503 (9) Å] inter­actions.
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