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In the title compound, C21H13BrClNO2S, the dihedral angle between the planes of the benzothia­zole and chloro­phenyl­methanone groups is 71.34 (6)°. In the crystal, weak C—H...N hydrogen bonds lead to dimer formation, whereas Br...Cl short contacts [3.4966 (11) Å] form infinite chains along the a-axis direction. Further, the C—H...O, C—H...π and π–π [centroid–centroid distance = 3.865 (2) Å] inter­actions stabilize the three-dimensional network.

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In the title compound, C20H15ClIN3O3, the dihedral angle between the quinazolinone ring system [r.m.s. deviation = 0.047 (2) Å] and the pendant benzene ring is 82.63 (11)°. The mol­ecular conformation is stabilized by intra­molecular C—H...O inter­actions. In the crystal, the mol­ecules are linked by N—H...O hydrogen bonds into chains along the a-axis direction. Another set of chains propagating along [101] is formed due to inter­molecular I...Cl short contacts of 3.427 (1) Å, thus giving layers parallel to (010). The layers are connected by C—H...π and π–π inter­actions, the shortest distance between the centroids of aromatic rings being 3.8143 (16) Å.
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