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In the title polymeric complex, [HgI2(C7H6N2)]n, the HgII atom is coordinated by one benzimidazole (bzim) and three I anions with a distorted tetra­hedral geometry; one I anion is in a monodentate coordination mode and the other two are bridging. The two bridging Hg—I bond distances differ significantly [2.7420 (7) and 3.0543 (7) Å]. The face-to-face separation of 3.31 (3) Å between the mean planes of parallel bzim ligands and the partially overlapped arrangement indicate the existence of π–π stacking.
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