Two isomorphous transition metal complexes displaying a coordinated tetrathionate unit: bis(4,4´-dimethyl-2,2´-bipyridine-κ2N,N´)(tetrathionato-κ2S,S´)cadmium(II) dimethylformamide disolvate and the zinc(II) analogue

HARVEY, M. A.; SUÁREZ, S. A.; DOCTOROVICH, F.; BAGGIO, R.

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2013 vol. C69 p. 745 - 749

0108-2701

The isomorphous title compounds, [Tr(S4O6)(C12H12N2)2]- 2C3H7NO (Tr = CdII and ZnII), consist of metal centres to which one tetrathionate and two 4,40-dimethyl-2,20-bipyridine chelating ligands bind. The structures are completed by two symmetry-related dimethylformamide solvent molecules. Each metal-centred complex is bisected by a twofold axis running through the metal centre and halving the chelating tetrathionate dianion through the central S?S bond. The ancillary symmetry-related 4,40-dimethyl-2,20-bipyridine ligands act as chelates. This results in a distorted six-coordinate geometry, with similar Tr?O/N distances but central angles differing substantially from 90 and 180. Both ligands are basically featureless from a geometric point of view, with torsion angles in both coordinated tetrathionate groups suggesting a trend linking metal size (covalent radius) and ligand ?openness?. Packing is directed by (C?H)aromatic  O bridges and ? offset stacked interactions defining chains along [001], further linked by weaker (C?H)methyl   O bridges, some of them mediated by the dimethylformamide solvent molecules.