N'-[(E)-1-(2-Hy-droxy-phen-yl)ethyl-idene]pyrazine-2-carbohydrazide

Abstract

The title compound, C13H12N4O2, crystallized with two independent mol-ecules (A and B) in the asymmetric unit. Mol-ecule B is planar to within 0.044 (3) Å for all non-H atoms, while mol-ecule A is slightly twisted, with a dihedral angle of 6.29 (4)° between the mean planes of the pyrazine-2-carbohydrazide and 1-(2-hy-droxy-phen-yl)ethanone moieties (r.m.s. deviations = 0.0348 and 0.0428 Å, respectively). S(5) and S(6) ring motifs are formed in both mol-ecules due to the presence of intra-molecular O-H⋯N and N-H⋯N hydrogen bonds. In the crystal, mol-ecules A and B are linked by a C-H⋯O hydrogen bond. They stack along the a-axis direction, forming columns with π-π inter-actions involving inversion-related pyrazine and benzene rings [centroid-centroid distances = 3.5489 (13)-3.8513 (16) Å].

Fig. 1.

View of the molecular structure of the two independent molecules (A and B) of the title compound, with atom labelling. Displacement ellipsoids are drawn at the 50% probability level. The intramolecular hydrogen bonds are shown as dashed lines (see Table 1 for details).

Fig. 2.

The crystal packing diagram of the title compound, viewed along the a axis. The various hydrogen bonds are shown as dashed lines (see Table 1 for details).