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In the title compound, C15H11Cl2NO2, the dihedral angle between the two benzene rings is 74.83 (5)°. The N-bound and terminal benzene rings are inclined at dihedral angles of 4.09 (10) and 78.38 (9)°, respectively, to the mean plane through the acetamide group. Intra­molecular C—H...O and N—H...O hydrogen bonds both generate S(6) rings.

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The title mol­ecule, C5H7N3O2, has an almost planar conformation, with a maximum deviation of 0.043 (3) Å, except for the methyl H atoms. In the crystal structure, inter­molecular C—H...O hydrogen bonds link the mol­ecules into layers parallel to the bc plane. Inter­molecular π–π stacking inter­actions [centroid–centroid distances = 3.685 (2) and 3.697 (2) Å] are observed between the parallel triazole rings.

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The title compound, C13H14OS, crystallizes with two independent mol­ecules in the asymmetric unit. The unit cell contains three voids of 197 Å3, but the residual electron density (highest peak = 0.24 e Å−3 and deepest hole = −0.18 e Å−3) in the difference Fourier map suggests no solvent mol­ecule occupies this void. The crystal structure is stabilized by π–π inter­actions between the isocoumarin ring systems, with centroid–centroid distances of 3.6793 (14) and 3.6566 (15) Å.
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