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.

2,8-Bis(3-phenyl­quinoxalin-2-yl)-5λ⁶-dibenzo[b,d]thio­phene-5,5-dione

The bond lengths and angles in the title compound, C₄₀H₂₄N₄O₂S, are normal. The dihedral angles between the dibenzothio­phene-S,S-dioxide and two quinoxaline groups are 34.88 (1) and 45.86 (1)°.

2-Phenyl-3-[6-(3-phenyl­quinoxalin-2-yl)dibenzo[b,d]thio­phen-3-yl]quinoxaline

In the mol­ecule of the title compound, C₄₀H₂₄N₄S, the two benzene rings fused to the thio­phene ring form a dihedral angle of 2.3 (2)°. In the crystal structure, there are no significant hydrogen-bonding inter­actions, but there are π–π stacking inter­actions between mol­ecules.