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In the title compound, C12H9BrN4O, the N′-methyl­idene­pyrazine-2-carbohydrazide and 4-bromobenzene groups are oriented at a dihedral angle of 10.57 (7)°. The hydrazide N—H group is involved in intra­molecular N—H...N inter­action, which generates an S(5) motif. A short C—H...O inter­action is formed between the methyl­idene H atom and the carbonyl O atom. It connects mol­ecules into chains extending along [100]. In addition, mol­ecules are arranged into stacks extending along [010] via π–π inter­actions between pyrazine and benzene rings, with centroid–centroid distances of 3.837 (2) and 3.860 (2) Å.

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

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In the title compound, C12H9BrN4O, the dihedral angle between the aromatic rings is 12.16 (12)°. An intra­molecular N—H...N hydrogen bond closes an S(5) ring. In the crystal, C—H...O hydrogen bonds link the mol­ecules into C(6) chains propagating in [010]. Very weak aromatic π–π stacking [centroid–centroid separations = 3.9189 (15) and 3.9357 (15) Å] is also observed.
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