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artículo con referato
"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"
Miguel Angel Harvey, Sebastián Suarez, Fabio Doctorovich and Ricardo Baggio
Acta Cryst. C 69(7) (2013) 745-749
The isomorphous title compounds, [Tr(S4O6)(C12H12N2)2]·2C3H7NO (Tr = CdII and ZnII), consist of metal centres to which one tetrathionate and two 4,4′-dimethyl-2,2′-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 4,4′-dimethyl-2,2′-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)aromaticO bridges and ππ offset stacked interactions defining chains along [001], further linked by weaker (C–H)methylO bridges, some of them mediated by the dimethylformamide solvent molecules.
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