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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 −  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 −  anions  via  inter­molecular N—H⋯I hydrogen bonds.

catena-Poly[[diiodidomercury(II)]-μ2-2-aminopyrazine-κ2N1:N4]

catena-Poly[[diiodidomercury(II)]-μ₂-2-aminopyrazine-κ²N¹:N⁴]