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The Zn atom in the title compound, [Zn(C14H6BrO3)2(C5H5N)2], lies on a centre of inversion. It is chelated by the bromo-substituted hydroxy­anthro­quinone mol­ecule and is coordinated by the pyridine mol­ecules in an all-trans octahedral geometry.

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In the title mol­ecule, C14H10BrN3OS, the indole moiety is twisted by 36.0 (2)° with respect to the disordered thienyl group and the nitro­gen-bound H atoms interact with the amide O atoms of symmetry-related mol­ecules, resulting in an N—H...O hydrogen-bonded layer structure.

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In the title structure, C14H10N4O2, the pyridyl ring is twisted with respect to the central —C(=O)—NH—N= fragment by 17.7 (1)°, whereas the indole fused-ring system is almost coplanar with this fragment. Molecules are linked into a linear chain motif by N—H...O hydrogen bonds.

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Molecules of the title compound, C16H16N2O3S, are linked by N—H...S hydrogen bonds to form centrosymmetric dimers [N...S = 3.4501 (13) Å]. The N′-phenyl and N-phenyl rings are twisted by 52.7 (1) and 23.3 (1)°, respectively, from the essentially planar —NHC(=S)NC(=O)— moiety.

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The Cu atom in the title compound, [Cu(C8H7O3)2], lies on a center of inversion and exists in a square-planar enviroment that is defined by the four chelating O atoms. Inter­molecular O—H...O hydrogen bonds [O...O = 2.711 (3)Å] link adjacent mol­ecules into a layer structure.

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The Cu atom in the title compound, [Cu(C14H6BrO3)2(C5H5N)2]·2H2O, lies on a center of inversion; it is chelated by the bromo-substituted hydroxy­anthroquinone mol­ecule and is coordinated by the pyridine mol­ecules in an all-trans octa­hedral geometry.

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The Ni atom in the crystal structure of the title compound, [Ni(C5H5N)2(C16H10BrN4O3)2]·2C5H5N, lies on a special position of site symmetry 2 in an all-cis octa­hedral geometry.

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In the title compound, C16H11BrN4O3·0.5H2O, the water mol­ecule lies on a twofold rotation axis. Symmetry-related mol­ecules are linked to form an N—H...O and O—H...O hydrogen-bonded layer structure.

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Mol­ecules of 5-bromo-1H-indole-3-carbaldehyde 3-methoxy­benzoyl­ylhydrazone, C17H14BrN3O2, are paired by amino-carbon­yl hydrogen bonds over a center of inversion, and adjacent pairs are further linked by hydrogen bonds into ribbons.

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The amine N atom of the isatin portion of the title compound (systematic name: 2-oxo-2,3-dihydro-1H-indole-3-carbaldehyde benzoylhydrazone), C15H11N3O2, forms a hydrogen bond with the amide O atom of the benzoyl­hydrazone portion of a symmetry-related mol­ecule, giving rise to a hydrogen-bonded chain structure that propagates by a glide plane along the c axis of the monoclinic unit cell.

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The amine N atom of the isatin portion of the title compound (systematic name: 2-oxo-2,3-dihydro-1H-indole-3-carbaldehyde benzoylhydrazone), C15H11N3O2, forms a hydrogen bond with the amide O atom of the benzoyl­hydrazone portion of a symmetry-related mol­ecule to give rise to a hydrogen-bonded chain structure that propagates by a twofold screw axis along the a axis of the ortho­rhom­bic unit cell.

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In the title structure, C16H12N4O3·0.5H2O, the uncoordinated water mol­ecule lies on a special position of site symmetry 2; O—H...O and N—H...O hydrogen bonds link the water and organic mol­ecules into a layer structure.
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