N'-Prop-ylisonicotinohydrazide.

In the title compound, C(9)H(11)N(3)O, the crystal structure is stabilized by a bifurcated inter-molecular N-H⋯(N,O) hydrogen bond and a C-H⋯O inter-action, leading to chains of mol-ecules.

In the title compound, C 9 H 11 N 3 O, the crystal structure is stabilized by a bifurcated intermolecular N-HÁ Á Á(N,O) hydrogen bond and a C-HÁ Á ÁO interaction, leading to chains of molecules.

Structure Reports Online
The bond lengths and angles for (I) are within their normal ranges (Allen et al., 1987). The dihedral angle between the mean planes on the N1/C1-C5 ring and the O1/N2/N3/C6 grouping is 48.97 (12)°.
As shown in Fig. 2, the crystal structure is stabilized by bifurcated intermolecular N-H···(N,O) hydrogen bonds (Table   1) and C-H···O interactions leading to chains of molecules.

Experimental
The title compound was synthesized according to the literature method (Deng et al., 2005): acetone (25 mmol) and isonicotinyl hydrazine (22 mmol) were dissolved in anhydrous ethanol (40 ml) and refluxed for 5 h, and a yellow precipitate was obtained, which was recrystalized from ethanol and diethyl ether (1:1 v/v) to yield yellow blocks of (I) after two days in an ice box.

Refinement
The N-bonded H atom was located in a difference map and freely refined. The C-bonded H atoms were placed in calculated positions with C-H = 0.93-0.96 Å and refined as riding with U iso (H) = 1.2U eq (C) or 1.5U eq (methyl C). Fig. 1. The molecular structure of (I), drawn with 30% probability displacement ellipsoids for the non-hydrogen atoms. 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 > σ(F 2 ) is used only for calculating Rfactors(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.