4-(5-Chlorothiophen-2-yl)-1,2,3-selenadiazole

In the title compound, C6H3ClN2SSe, the selenadiazole and chlorothiophene rings are almost coplanar [dihedral angle = 5.24 (15)°]. In the crystal, C—H⋯N interactions link the molecules into chains extending along the b-axis direction. C—H⋯π interactions also occur.

In the title compound, C 6 H 3 ClN 2 SSe, the selenadiazole and chlorothiophene rings are almost coplanar [dihedral angle = 5.24 (15) ]. In the crystal, C-HÁ Á ÁN interactions link the molecules into chains extending along the b-axis direction. C-HÁ Á Á interactions also occur.
Glutathione peroxidases(GPx) are the antioxidant selenoenzymes protecting various organisms from oxidative stress by catalyzing the reduction of hydroperoxides at the expense of glutathione(GSH) (Stadtman, 1991). In view of the growing importance of selenium containing compounds, the crystal structure of the title compound has been carried out.
The ORTEP plot of the molecule is shown in Fig. 1 The packing of the molecules is shown in Fig. 2. The crystal packing is stabilized by C-H···N intermolecular interactions, linking the molecules to chains extending along the b axis.

Refinement
H atoms were positioned geometrically (C-H =0.93-0.97 Å) and allowed to ride on their parent atoms, with U iso (H) set to 1.2U eq (C).

Figure 1
The molecular structure of the title compound, showing the atomic numbering and displacement ellipsoids drawn at 30% probability level.  The crystal packing. 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 R-factors(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.