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Two complexes, [HgL 1 Cl 2 ] n (1) and [Hg 2 (L 2) 2 Cl 4 ] n (2), have been synthesized and characterized from two dipyridylamide ligands (L 1 and L 2) with mercury(II) chloride, respectively. The two complexes exist as 1D coordination polymers but exhibit different architectures with slightly adjusted 3-and 4-position of nitrogen atom in the pyridyl rings from the two ligands. In complex 1, the mercury(II) center is four-coordinated with distorted tetrahedral geometry in 1D-chain structures. In complex 2, the mercury(II) center is five-coordinated with distorted square pyramidal geometry in the 1D-looped structures. The thermal stabilities and vapor adsorption properties of the two complexes were investigated as well.

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