2,5-Diamino-3,6-dichloropyrazine

The synthesis and crystal structure of 2,5-diamino-3,6-dichloropyrazine, C₄H₄Cl₂N₄, are described. The centrosymmetric molecule has an exocyclic C—N distance of 1.362 (3) Å, and a nearly planar amine group [the angles at N sum to 351 (2)°]. Within the crystal, the molecules form a ribbon through two centrosymmetric pairs of N—H...N hydrogen-bond interactions, where the N...N distance is 3.110 (3) Å.

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