2-Cyano-N′-[1-(pyridin-2-yl)ethylidene]acetohydrazide

In the title compound, C10H10N4O, the dihedral angle between the pyridine ring and the –C=O(CH2)CN group is 24.08 (12)°. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds generate R 2 2(8) loops.

In the title compound, C 10 H 10 N 4 O, the dihedral angle between the pyridine ring and the -C=O(CH 2 )CN group is 24.08 (12) . In the crystal, inversion dimers linked by pairs of N-HÁ Á ÁN hydrogen bonds generate R 2 2 (8) loops.

Related literature
For the biological activity of hydrazone compounds, see: Rauf et al. (2008); Zhang et al. (2012). For related structures, see: Taha
The intensity data were collected by Xiao-Lin Han under the guidance of Mr Yanglu Zhu at Dalian Institute of Technology.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6969).  Rauf et al., 2008;Zhang et al., 2012). In the present work, the title new hydrazone compound, derived from 2-acetylpyridine and cyanoacetohydrazide, is reported.
Experimental 2-Acetylpyridine (1.0 mmol, 0.121 g) and cyanoacetohydrazide (1.0 mmol, 0.991 g) were mixed and stirred in methanol (50 mL) at room temperature for 1 h. Colorless block-shaped single crystals were obtained after slow evaporation of the solution in air for a few days.

Refinement
H3A attached to N3 was located in a difference Fourier map and was refined isotropically, with N-H distance of 0.90 (1) Å. The remaining hydrogen atoms were positioned geometrically and allowed to ride on their parent atoms, with C-H = 0.93-0.97 Å for aromatic and CH 2 and 0.96 Å for CH 3 . The U iso values were constrained to be 1.5U eq of the carrier atom for methyl and 1.2U eq for the remaining H atoms. A rotating group model was used for the methyl group.

Computing details
Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT (Bruker, 1998); 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 (Sheldrick, 2008   where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.14 e Å −3 Δρ min = −0.18 e Å −3 Special details Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.