Mercury(II) complexes with heterocyclic thiones - Preparation and characterization of the 1:1 and 1:2 mercury(II) complexes with benzo-1,3-imidazole-2-thione
- Author(s)
- Zora Popovic, Zeljka Soldin, Dubravka Matkovic-Calogovic, Gordana Pavlovic, Masa Rajic, Gerald Giester
- Abstract
A series of complexes HgX2(bzimtH2) and HgX2(bzimtH2)2 (X = Cl-, Br- I-, SCN-; bzimtH2 = benzo-1,3-imidazole-2-thione) was obtained by reaction of the mercury(II) salts with benzo-1,3-imidazole-2-thione in the appropriate molar ratio (1:1 or 1:2). Hg(bzimtH)2 was obtained by the deprotonation of bzimtH2 with mercury(II) acetate (irrespective of the molar ratio of the reactants). The complexes were characterised by chemical and thermal analysis, IR, 1H, and 13C NMR spectroscopy, and some [HgX2(bzimtH2), X = I- and HgX2(bzimtH2)2, X = I- and SCN-] by X-ray single crystal diffractometry. 1H and 13C NMR spectroscopic measurements in dimethyl sulphoxide revealed that the sulphur atom is coordinated to the mercury centre. The greatest complexation effects on the chemical shifts were observed for the thione carbon atom and thioamide proton. The crystal structures of HgI2(bzimtH2)2 and Hg(SCN)2(bzimtH2)2 žC2H5OH consist of discrete monomeric molecules with halide or pseudohalide donor atoms and thione sulphur atoms tetrahedrally coordinated to the mercury atom. The structure of HgI2(bzimtH2) is polymeric with a trigonal bipyramidal 3 + 2 coordination geometry around the mercury atom. Polymerisation occurs through HgžžžI interactions with neighbouring molecules. The distribution of the p-electron density in bzimtH2 corresponds to the thioketo tautomeric form in the solid state, and also in the DMSO solution of the complexes. Intermolecular hydrogen bonds of the type N-HžžžN, N-HžžžS and N-HžžžI are observed.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- University of Zagreb, Brodarski Institute, Marine Research and Special Technologies
- Journal
- European Journal of Inorganic Chemistry
- Pages
- 171-180
- No. of pages
- 10
- ISSN
- 1434-1948
- Publication date
- 2002
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1051 Geology, Mineralogy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/26cffc58-38d0-43fe-9c20-a01644d512d3