Diiodidobis(N,N,N′,N′-tetramethylthiourea-κS)cadmium(II)

In the title compound, [CdI2(C5H12N2S)2], the CdII ion is located on a twofold rotation axis and is coordinated in a distorted tetrahedral mode by two iodide ions and by two tetramethylthiourea (tmtu) ligands through their S atoms. The crystal structure is stabilized by C—H⋯N and C—H⋯S hydrogen bonds.

In the title compound, [CdI 2 (C 5 H 12 N 2 S) 2 ], the Cd II ion is located on a twofold rotation axis and is coordinated in a distorted tetrahedral mode by two iodide ions and by two tetramethylthiourea (tmtu) ligands through their S atoms. The crystal structure is stabilized by C-HÁ Á ÁN and C-HÁ Á ÁS hydrogen bonds.

Diiodidobis(N,N,N',N'-tetramethylthiourea-S)cadmium(II)
S. Nawaz, S. Sadaf, M. Fettouhi, A. Fazal and S. Ahmad Comment A considerable amount of work has been done in recent years on the synthesis and characterization of cadmium(II) and mercury(II) complexes of thiourea type ligands due to their variable binding modes and because of the their importance in biological systems (Ahmad et al., 2009;Bell et al., 2001Bell et al., , 2004Lobana et al., 2008;Marcos et al., 1998;Matsunaga et al., 2005;Moloto et al., 2003;Wazeer et al., 2007). Cadmium(II) complexes with thiones possess a variety of structures ranging from four-to six-coordinate species with tetrahedral and octahedral environments for the Cd II atom, respectively. In some cases, these units further aggregate to form polymeric structures (Bell et al., 2001(Bell et al., , 2004Lobana et al., 2008;Matsunaga et al., 2005;Moloto, et al., 2003;Wazeer et al., 2007). We report here the crystal structure of a cadmium(II) iodide complex with tetramethylthiourea (tmtu).
For a more detailed description of the structure, see: Nawaz et al. (2010a).

Experimental
To 0.37 g (1.0 mmol) cadmium(II) iodide in 10 ml water was added to two equivalents of tetramethylthiourea in 15 ml methanol. A clear solution was obtained that was stirred for 30 minutes. The colorless solution was filtered and the filtrate was kept at room temperature for crystallization. As a result, a white crystalline product was obtained, that was washed with methanol and dried.

Refinement
H atoms were placed in calculated positions with a C-H distance of 0.96 Å and U iso (H) = 1.5 U eq (C). Fig. 1. The molecular structure of title compound with atomic numbering scheme. Displacement ellipsoids drawn at the 30% probability level. H-atoms were omitted for clarity. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Figures
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )