(4,4′-Dimethyl-2,2′-bipyridine-κ2 N,N′)(dimethyl sulfoxide-κO)diiodidocadmium(II)

In the title compound, [CdI2(C12H12N2)(C2H6OS)], the CdII cation is coordinated by two N atoms from a dimethylbipyridine ligand, one O atom from a dimethyl sulfoxide molecule and two I− anions in a distorted trigonal–bipyramidal geometry. Intramolecular C—H⋯O hydrogen bonding and intermolecular π–π stacking between parallel pyridine rings [centroid–centroid distance = 3.658 (3) Å] are present in the crystal structure.

In the title compound, [CdI 2 (C 12 H 12 N 2 )(C 2 H 6 OS)], the Cd II cation is coordinated by two N atoms from a dimethylbipyridine ligand, one O atom from a dimethyl sulfoxide molecule and two I À anions in a distorted trigonalbipyramidal geometry. Intramolecular C-HÁ Á ÁO hydrogen bonding and intermolecularstacking between parallel pyridine rings [centroid-centroid distance = 3.658 (3) Å ] are present in the crystal structure.
In the title compound ( Fig. 1), the Cd II atom is five-coordinated in a distorted square-pyramidal configuration by two N atoms from one 4,4'-dimethyl-2,2'-bipyridine, one O atom from one dimethyl sulfoxide and two I atoms. The Cd-I and Cd-N bond lengths and angles are collected in Table 1. In the crystal structure, intermolecular C-H···O hydrogen bonds (Table 2)

Experimental
For the preparation of the title compound a solution of 4,4'-dimethyl-2,2'-bipyridine (0.15 g, 0.80 mmol) in methanol (10 ml) was added to a solution of CdI 2 (0.29 g, 0.80 mmol) in methanol (5 ml) at room temperature. The suitable crystals for X-ray diffraction experiment were obtained by methanol diffusion to a colorless solution in DMSO. Suitable crystals were isolated after one week (yield; 0.36 g, 71.6%).

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
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.