Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 7 (July 2013)

metal-organic compounds

Acta Cryst. (2013). C69, 745-749    [ doi:10.1107/S0108270113016521 ]

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

M. A. Harvey, S. Suarez, F. Doctorovich and R. Baggio

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)aromatic...O bridges and [pi]-[pi] 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.

Formula: [Cd(S4O6)(C12H12N2)2]·2C3H7NO and [Zn(S4O6)(C12H12N2)2]·2C3H7NO

hkldisplay filedownload file

Structure factor file (CIF format) (188.5 kbytes)
[ doi:10.1107/S0108270113016521/fn3139Isup2.hkl ]
Contains datablock I

hkldisplay filedownload file

Structure factor file (CIF format) (193.5 kbytes)
[ doi:10.1107/S0108270113016521/fn3139IIsup3.hkl ]
Contains datablock II


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