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In the crystal structure of the title compound, [HgBr 2 (C 5 H 5 N 3 O) 2 ]  n  , the Hg II  cation is located on an inversion center and is coordinated by two N atoms from the pyrazine rings and four bridging Br −  anions in a distorted octa­hedral geometry. The Br −  anions bridge the Hg II  cations with significantly different Hg—Br bond distances of 2.4775 (8) and 3.1122 (8) Å, forming polymeric chains running along the  a  axis. Inter­molecular N—H⋯O and N—H⋯N hydrogen bonds are effective in the stabilization of the crystal structure.

catena-Poly[[bis(pyrazine-2-carboxamide-κN4)mercury(II)]-di-μ-bromido]

catena-Poly[[bis(pyrazine-2-carboxamide-κN⁴)mercury(II)]-di-μ-bromido]