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.

5-[1-(4-Methyl­phen­yl)-2-nitro­but­yl]-4-phenyl-1,2,3-selenadiazole

In the title compound, C₁₉H₁₉N₃O₂Se, the selenadiazole ring is roughly planar [maximum deviation 0.033 (6) Å]. The attached phenyl ring is twisted away at an angle of 47.5 (1)°. The butyl group is in an extended conformation [C—C—C—C torsion angle = 174.7 (2)°]. In the crystal, C—H...O inter­actions form C(10) chains running aling the c-axis direction.

Ethyl 3-(4-chloro­phen­yl)-2-phenyl-3-(4-phenyl-1,2,3-selena­diazol-5-yl)propano­ate

In the title compound, C₂₅H₂₁ClN₂O₂Se, the selena­diazole ring is almost planar [maximum deviation = 0.004 (2) Å], and the adjacent benzene ring is twisted by 50.6 (1)° with respect to this ring.