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The structure of the title compound, C22H15ClN2O4S, comprises non-planar mol­ecules that form a one-dimensional hydrogen-bonded chain via a single N—H...O interaction, which runs parallel to the b axis. The dihedral angle between the thia­zole and quinone rings is 50.43 (7)° and the dihedral angle between the thia­zole and the phenyl rings is 52.4 (1)°.

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The structure of the title compound, C9H12N2O4S·0.5H2O, comprises two thia­zole mol­ecules and one water mol­ecule in the asymmetric unit. The two thia­zoles associate via N—H...N hydrogen-bonding inter­actions to form R22(8) graph-set dimers, while the other NH groups and water mol­ecules construct a hydrogen-bonding network that involves three of the four eth­yl ester carbon­yl O atoms.

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The structure of the title compound, C7H11N3O3, consists of mol­ecules that pack in a linear hydrogen-bonded ribbon motif. This hydrogen-bonding arrangement is constructed through two dimer formations, one that is atypical of pyrazoles (N—H...N) and the other via an inter­action from the hydr­oxy OH group to one of the nitro O atoms.

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The structure of the title compound, C7H11BrN2O·H2O, exhibits an elaborate hydrogen-bonding network involving pyrazole N—H...O dimers and two other hydrogen-bonding motifs, both including water mol­ecules. One motif is a distorted hexa­gonal R35(11) graph set, while the other is a distorted octa­gonal boat conformation R64(14) graph set.
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