catena-Poly[μ2-iodido-diiodidobis(μ3-pyridine-2-thione-κ3 S:S:S)(μ2-pyridine-2-thione-κ2 S:S)tricopper(I)]

In the title compound, [Cu3I3(C5H5NS)3]n, a polymeric structure is formed along [100] through bridging iodide and pyridine-2-thione ligands. The metal atoms are engaged in [Cu3S3] and [Cu2S2] rings sharing Cu—S edges, with the [Cu2S2] rings located about inversion centers. CuI atoms bridged by iodide ions exhibit the shortest Cu⋯Cu separation in the polymer [2.8590 (14) Å]. The three independent CuI atoms all display distorted tetrahedral coordination geometries.

In the title compound, [Cu 3 I 3 (C 5 H 5 NS) 3 ] n , a polymeric structure is formed along [100] through bridging iodide and pyridine-2-thione ligands. The metal atoms are engaged in [Cu 3 S 3 ] and [Cu 2 S 2 ] rings sharing Cu-S edges, with the [Cu 2 S 2 ] rings located about inversion centers. Cu I atoms bridged by iodide ions exhibit the shortest CuÁ Á ÁCu separation in the polymer [2.8590 (14) Å ]. The three independent Cu I atoms all display distorted tetrahedral coordination geometries.

Fang Ke and Wen Wu Comment
The coordination chemistry of Cu(I) is of considerable interest because these complexes have luminescence properties, antimicrobial activity, and potential applications in catalysis, photography, and electrochemical processes (Kitagawa et al., 1990;Raper, 1996Raper, , 1997. On the other hand, pyridine-2-thiolate can bind to a metal or a group of metals via a variety of bonding modes, and this versatility is attributed to the size of the S atom and its proximity to the pyridyl N atom (García-Vázquez et al., 1999;Akrivos, 2001;Lobana et al., 2002). The large size of the S atom makes it easier to adopt different coordination angles in complexes, which is necessary in order to match different geometries.
We report here the crystal structure of the title compound, which displays a polymeric chain structure ( Fig. 1 and 2).

Experimental
An oven-dried Schlenk tube was charged with CuI (0.4 mmol), and pyridine-2-thione (0.4 mmol). The tube was evacuated and backfilled with N 2 . The reaction mixture was stirred at 333 K for 4 h and then allowed to cool to room temperature. The insoluble residues were removed by filtration, and the filtrate was evaporated slowly at room temperature for about one month, to yield yellow crystals. Crystals suitable for single-crystal X-ray diffraction were selected directly from the sample as prepared.

Refinement
All H atoms were placed in calculated positions and treated as riding on their parent atoms, with bond lengths fixed to 0.93 Å for C-H bonds and 0.86 Å for N-H bonds. Isotropic displacement parameters for H atoms were calculated as U iso (H) = 1.2U eq (carrier atom).

Figure 1
The molecular structure of the title compound, showing 30% probability displacement ellipsoids. H atoms have been omitted for clarity.

Figure 2
View of the one-dimensional extended chain structure in the title compound.