2-Hydroxyamino-2-oxoacetohydrazide

In the title compound, C2H5N3O3, the hydroxamic group adopts an anti orientation with respect to the hydrazide group. In the crystal, molecules are connected by N—H⋯O and O—H⋯N hydrogen bonds into zigzag chains along the c axis.

In the title compound, C 2 H 5 N 3 O 3 , the hydroxamic group adopts an anti orientation with respect to the hydrazide group. In the crystal, molecules are connected by N-HÁ Á ÁO and O-HÁ Á ÁN hydrogen bonds into zigzag chains along the c axis.
Besides, it is known that hydroxamic acids can act as inhibitors of enzymes as well as promising antitumor agents (Kaczka et al.,1962;Komatsu et al., 2001). Therefore, study of new hydroxamic acids is timely and important research topic. As a part of our on-going work, we report the structure of the title compound (1), which comprises several groups capable to form hydrogen bond interactions.
In the crystal the molecules are connected by N-H···O, O-H···N hydrogen bonds (

Refinement
The hydrogen atoms were located from the difference Fourier map and were constrained to ride on their parent atoms with U ĩso = 1.2-1.5 U eq (parent atom). The highest peak is located 0.77 Å from atom C1 and the deepest hole is located 0.81 Å from atom N2. In the absence of significant anomalous scattering effects, 150 Friedel pairs were averaged in the final refinement. Fig. 1. The molecular structure of (1), with 40% probability displacement ellipsoids showing the atom-numbering scheme employed.

Special details
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional