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[[mu]-N,N'-Bis­(pyridin-3-yl)benzene-1,4-dicarboxamide-1:2[kappa]2N:N']bis­{[N,N'-bis­(pyridin-3-yl)benzene-1,4-dicarboxamide-[kappa]N]di­iodidomercury(II)}, [Hg2I4(C18H14N4O2)3], is an S-shaped dinuclear mol­ecule, composed of two HgI2 units and three N,N'-bis­(pyridin-3-yl)benzene-1,4-di­car­boxamide (L) ligands. The central L ligand is centrosymmetric and coordinated to two HgII cations via two pyridine N atoms, in a syn-syn conformation. The two terminal L ligands are monodentate, with one uncoordinated pyridine N atom, and each adopts a syn-anti conformation. The HgI2 units show highly distorted tetra­hedral (sawhorse) geometry, as the HgII centres lie only 0.34 (2) or 0.32 (2) Å from the planes defined by the I and pyridine N atoms. Supra­molecular inter­actions, thermal stability and solid-state luminescence properties were also measured.
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