Acta Cryst. (2013). C69, 745-749 [ doi:10.1107/S0108270113016521 ]
Abstract: 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 - offset stacked interactions defining chains along , further linked by weaker (C-H)methylO bridges, some of them mediated by the dimethylformamide solvent molecules.
Formula: [Cd(S4O6)(C12H12N2)2]·2C3H7NO and [Zn(S4O6)(C12H12N2)2]·2C3H7NO
Structure factor file (CIF format) (188.5 kbytes)
Structure factor file (CIF format) (193.5 kbytes)
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