Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.020 Å; disorder in main residue; R factor = 0.083; wR factor = 0.224; data-to-parameter ratio = 17.9.In the crystal of the title polymeric compound, [HgI 2 (C 4 H 5 N 3 )] n , the Hg II cation is located on a twofold rotation axis and is coordinated by two I À anions and two 2-aminopyrazine ligands in a distorted HgI 2 N 2 tetrahedral geometry. In the crystal, the 2-aminopyrazine ligand is equally disordered over two positions about an inversion center, and bridges the Hg II cations with pyrazine N atoms to form a polymeric chain running along the c axis. In the polymeric chain, the amino groups link to the coordinated I À anions via intermolecular N-HÁ Á ÁI hydrogen bonds.
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