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In the title hydrate, C19H15N3O3·H2O, the three aromatic groups in the quinoline derivative are close to coplanar: the central oxa­diazole fragment makes dihedral angles of 15.7 (2)° with the benzene ring and 5.30 (14)° with the quinoline ring system. In the crystal, the organic mol­ecules are connected with water mol­ecules by pairs of O—H...N hydrogen bonds involving the quinoline and oxa­diazole N atoms. The mol­ecules form stacks along the a axis, neighboring mol­ecules within each stack being related by inversion and the shortest distance between the centroids of the oxa­diazole and pyridine rings being 3.500 (2) Å. Mol­ecules from neighboring stacks are linked by weak C—H...O hydrogen bonds, forming a three-dimensional structure.

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In the title compound, C18H13N3O2·H2O, the oxa­diazole ring forms dihedral angles 7.21 (10) and 21.25 (11)° with the quinoline and benzene rings, respectively. The crystal structure features O—H...N hydrogen bonds and is further consolidated by C—H...O hydrogen-bonding inter­actions involving the water molecule of hydration.
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