Received 13 June 2013
aDepartment of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan,bMedicinal Botanic Centre, PCSIR Laboratories Complex, Peshawar, Pakistan,cDepartment of Physics, University of Sargodha, Sargodha, Pakistan,dDepartment of Chemistry, University of Hazara, Mansehra, Pakistan, and eDepartment of Chemistry, University of Sargodha, Sargodha, Pakistan
Correspondence e-mail: firstname.lastname@example.org
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-HN interaction, which generates an S(5) motif. A short C-HO interaction is formed between the methylidene H atom and the carbonyl O atom. It connects molecules into chains extending along . In addition, molecules are arranged into stacks extending along  via - interactions between pyrazine and benzene rings, with centroid-centroid distances of 3.837 (2) and 3.860 (2) Å.
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: GK2580 ).
The authors acknowledge the provision of funds for the purchase of a diffractometer and encouragement by Dr Muhammad Akram Chaudhary, Vice Chancellor, University of Sargodha, Pakistan. The authors are also thankful to the Higher Education Commission (HEC) of Pakistan for financial support. MA is also thankful to the Pakistan Council of Scientific and Industrial Research (PCSIR) Laboratories of Pakistan for financial support throughout his study leave.
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