Received 19 September 2011
There are three independent moleculesi n the asymmetric unit of the title compound, C18H16BrN3O3, in which the dihedral angles between the indole and benzene rings are 76.9 (2), 4.9 (2), and 70.9 (2)°. All three molecules exist in a trans configuration with respect to the methylidene units. In each molecule, there is one intramolecular O-HN hydrogen bond. In the crystal, N-HO hydrogen bonds occur.
For the syntheses and crystal structures of hydrazone compounds, see: Hashemian et al. (2011); Lei (2011); Shalash et al. (2010). For the crystal structures of similar compounds reported recently by the author, see: Li (2011a,b).
Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: QM2030 ).
The author is grateful to the Zibo Vocational Institute for supporting this work.
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