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Synthesis and characterization of mercury(II) complexes with 2-styryl-1, 3-benzothiazole (sb). Presence of two differently coordinated Hg(II) ions in the dinuclear complex Hg2Cl4(sb)3. Structural characterization of 2-styryl-1, 3-benzothiazole and some of its derivatives

The molecular and crystal structures of the following compounds 2-styryl-1, 3-benzothiazole, sb, (1), Hg2Cl4(sb)3 (2), 1, 3-bis(1, 3-benzothiazol- 2-yl)-2, 4-diphenylcyclobutane (3) 1, 3-bis(1, 3-benzothiazol-2-yl)-2, 4-bis(4-chlorophenyl)cyclobutane (4) and HgBr2(sb)2 (5) were determined by single-crystal X-ray diffractometry. The crystal structure of 1 consists of discrete sb molecules which are essentially planar. The dimeric molecules of 3 and 4 are characterized by a cyclobutane ring. In both isolated complexes 2 and 5, sb acts as a neutral monodentate ligand coordinated to the mercury atom through the thiazolyl nitrogen atom. The dinuclear complex 2 is characterized by the unique example of two differently coordinated Hg(II) ions bridged via a non-symmetrical linear Cl bridge. The first one is coordinated by one terminal and one bridging Cl ion and two thiazolyl nitrogen atoms in the form of distorted tetrahedron. The second one is bonded to two terminal Cl ions and the bridging Cl ion and one thiazolyl nitrogen atom in a 2+2 manner. In complex 5 the Hg(II) ion, which is situated on a crystallographic twofold axis, is tetrahedrally coordinated by two Br ions and two thiazolyl nitrogen atoms. Both complexes are characterized by stronger mercury-to-halide covalent bonds than mercury-to-nitrogen bonds, which are regarded as contacts shorter than the van der Waals radii sum of the corresponding atoms. The geometry of the sb ligand in both complexes 2 and 5 has not been changed remarkably from that one in the uncoordinated state due to not so strong bonds formation with the Hg(II) ion.

aryl-1; 3-benzothiazole derivatives; mercury(II) complexes; X-ray study; TGA/DSC measurements; IR; NMR spectroscopy

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