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Three new mercury(II) coordination compounds, {[HgCl(pic)]}  n  ( 1 ), [HgCl(pic)(picH)] ( 2 ), and [HgBr(pic)(picH)] ( 3 ) (picH = pyridine-2-carboxylic acid, picolinic acid) were prepared by reactions of the corresponding mercury(II) halides and picolinic acid in an aqueous ( 1 ) or alcohol-methanol or ethanol ( 2 and 3 ) solutions. Two different types of coordination compounds were obtained depending on the solvent used. The crystal structures were determined by the single-crystal X-ray structural analysis. Compound 1 is a one-dimensional (1-D) coordination polymer with mercury(II) ions bridged by chelating and bridging N , O , O '-picolinate ions. Each mercury(II) ion is four-coordinated with a bidentate picolinate ion, a carboxylate O atom from the symmetry-related picolinate ion and with a chloride ion; the resulting coordination environment can be described as a highly distorted tetrahedron. Compounds 2 and 3 are isostructural mononuclear coordination compounds, each mercury(II) ion being coordinated with the respective halide ion, N , O -bidentate picolinate ion, and N , O -bidentate picolinic acid in a highly distorted square-pyramidal coordination environment. Compounds 1-3 were characterized by IR spectroscopy, PXRD, and thermal methods (TGA/DSC) in the solid state and by 1 H and 13 C NMR spectroscopy in the DMSO solution.

The Solvent Effect on Composition and Dimensionality of Mercury(II) Complexes with Picolinic Acid