Mercury(II) halide adducts of a dicarboxylate-like ligand: Crystal structures of polymeric mercury(II) complexes with 1,4-diazoniobicyclo[2.2.2]octane-1,4-diacetate |
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Authors: | De-Dong Wu Thomas C. W. Mak |
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Affiliation: | (1) Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong |
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Abstract: | Three mercury(II) complexes containing double-betaine and halide ligands, [(HgCl2)2(L1)]n (1), [(HgBr2)2(L1)(H2O)2]n (2), and [2HgCl2(HL1)·Hg2Cl6]n (3) [L1=–O2CCH2N+(CH2CH2)3-N+H2CO2–], have been prepared and shown to have polymeric structures by single-crystal X-ray analysis. Complex (1) exhibits an infinite zigzag chain in which each mercury(II) atom is coordinated by pairs of carboxylate oxygen atoms and chloride ligands in a distorted tetrahedral geometry. In complex (2), the mercury(II) atom is in an unusual square-planar coordination geometry, and weak mercury-ligand and hydrogen bonding extend the structural skeletons into a three-dimensional network. Complex (3) consists primarily of an assembly of HgCl2(HL1) moieties and [Hg2Cl6]– anions, and the mercury(II) atoms are in planar T-shaped and distorted tetrahedral coordination environments, respectively. The resulting three-dimensional network is based on the cross-linkage of nearly planar, wide ribbons running in thea direction. |
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Keywords: | Mercury(II) dicarboxylate double betaine 1,4-diazoniobicyclo[2.2.2]octane-1,4-diacetate X-ray crystallography polymeric structure |
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