2,5-Bis(4-tert-butyl­phen­yl)-3,4-dinitro­thio­phene

The title compound, C₂₄H₂₆N₂O₄S, is a precursor for the production of low band gap conjugated polymers. The dihedral angles between the thio­phene and benzene rings are 31.5 (1) and 52.2 (1)°, and that between the two benzene rings is 35.7 (1)°.

3,4-Dinitro-N,N,N',N'-tetra­phenyl­thio­phene-2,5-diamine

The title compound, C₂₈H₂₀N₄O₄S, studied with X-ray crystallography, NMR, mass spectrometry and elemental analysis, is presented. The two C=C double bonds are slightly shorter than those of the parent thio­phene, while the C-C single bond is slightly elongated.