Güven, Özden Özel
Coles, Simort. J.
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The asymmetric unit of the title compound, C21H17Cl2N3O, contains two crystallographically independent molecules with similar conformations. The benzotriazole ring is oriented at dihedral angles of 30.61 (5) and 43.36 (5)°, respectively, to the phenyl and dichlorophenyl rings in one molecule, and 32.25 (5) and 41.04 (5)° in the other. The dihedral angles between the phenyl and dichlorophenyl rings are 66.38 (7) and 66.14 (6)° in the two molecules. An intramolecular O—H⋯N hydrogen bond links the benzotriazole ring and phenylpropanol unit in each molecule. In the crystal, weak intermolecular C—H⋯N hydrogen bonds link the molecules into chains along the a axis. π–π stacking between the dichlorophenyl rings [centroid–centroid distances = 3.809 (1) and 3.735 (1) Å] may further stabilize the crystal structure.