Synthesis and crystal structures of two dialkyl-substituted sexithiophenes

Molecular Packing in Unsubstituted Semiconducting Phenylenevinylene Oligomer and Polymer

“…(Regioregular -substitution of R6T, on the other hand, has led to the formation of single crystals in several cases. 44 …”

Probing the Local Conformation within π‐Conjugated One‐dimensional Supramolecular Stacks using Frequency Modulation Atomic Force Microscopy

“…Synthesis of QTF8: QTF8 was prepared using a synthetic strategy [28,31] based on the Stille cross-coupling reaction between 2,7-dibromofluoren-9-one and a-stanylated 3,3 000 -dioctyl-[2,2 0 ;5 0 ,2 00 ;5 00 ,2 000 ]-quaterthiophene, the latter being synthesized following the procedure reported by Herrema et al [32]. All commercially available reagents were used as received without further purification.…”

Nature of optical transitions in conjugated oligomers. II. Theoretical characterization of neutral and doped oligothiophenes

“…Crystalline oligothiophenes are found to be nearly planar due to large packing effects; [23][24][25] however, torsions between adjacent thiophene rings can occur in the gas phase as is the case for bithiophene, where a 35°dihedral angle is measured between the two rings 26 while a ϳ30°angle is calculated from high-level correlated ab initio calculations 27 ͑the dihedral angle between adjacent rings is estimated at ϳ26°at the AM1 level͒. As also stressed in the case of oligo͑phenylenevinylene͒s, 10 the choice of planar conformations is validated by the appearance upon doping of a quinoid character in the rings that forces the systems to adopt more planar conformations, and by the results of ab initio calculations that indicate no significant changes in the optical properties up to torsion angles around 30°-40°.…”