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A Design of Mercury(II) Coordination Polymers with Pyridinedicarboxylic Acids: Structural, Spectroscopic and Thermal Studies

Two novel mercury(II) coordination polymers, two-dimensional [HgCl(2, 3-pydcH)(H2O)]n (1) and one-dimensional [HgCl(2, 5-pydcH)(DMF)]n (2) (2, 3-pydcH2 = pyridine-2, 3-dicarboxylic acid ; 2, 5-pydcH2 = pyridine-2, 5-dicarboxylic acid), were prepared in the reactions of the corresponding pyridinedicarboxylic acid with mercury(II) chloride. Their structures were solved by the single-crystal X-ray diffraction method. Both 2, 3-pydcH− and 2, 5-pydcH− are partially deprotonated bridging ligands which display similar coordination modes, acting as N, O-bidentate and O’-monodentate ligands in the structures of 1 and 2, respectively. The presence of DMF in the reaction mixture led to the formation of a 1D coordination polymer, while a 2D coordination polymer was formed in the absence of DMF. Spectroscopic analysis of 1 and 2 was performed by IR spectroscopy in the solid state and by 1H and 13C NMR spectroscopy in the DMSO solutions. Thermal properties of the coordination polymers 1 and 2 were also investigated. NMR data support complete decomposition of 1 and a preserved polymeric structure of 2 in the DMSO solution.

Coordination polymer ; 2D network ; Coordination mode ; Mercury(II) ; Pyridinedicarboxylic acids

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