Received 12 July 2008
The title compound, C9H9BrN2O2, crystallizes with two independent but essentially identical molecules in the asymmetric unit. Each molecule adopts a trans configuration with respect to the C=N bond. In one of the molecules, the dihedral angle between the benzene ring and the hydrazinecarboxylic acid plane is 24.9 (2)°, and that in the other molecule is 16.1 (2)°. The molecules are linked into a three-dimensional network via intermolecular N-HO, C-HO, C-HN and C-HBr hydrogen bonds. An intramolecular N-HO hydrogen bond is also present.
Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); 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: CI2632 ).
The authors acknowledge financial support from Zhejiang Police College, China.
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