Synthesis and crystal structures of unsymmetrical wave-shaped heptathienoacenes

Abstract

Three unsymmetrical wave-shaped heptathienoacenes (UHT-1, UHT-2 and UHT-3) with different isomeric locations of sulfur atoms in the two terminal thiophene rings were designed and synthesized. The synthetic strategy contains two...

Dragon-Boat-Type Heptathienoacenes: Synthesis, Structures, and Their Applications in OFETs

“…Another one is the high challenge of synthetic work. 10−13 Until now, a few HTs including linear, 10,11b bullhorn-shaped, 4b,11 helical, 4c,12 and wave-shaped 13 Herein, we report a novel synthetic strategy for the construction of a new family of HTs, the dragon-boat-type heptathienoacenes (DBHTs). The key synthetic step is the C− C cross-coupling between two DTTs occurring on their αand β-positions, which generates the unsymmetrical dimers of DTT (biDTT, Figure 2).…”

“…There are two main factors to limit OFET work of HT s. One is the unobtrusive OFET performance from the limited examples of PTA and HTA ; the relative structure–property relationship is not clear. Another one is the high challenge of synthetic work. − Until now, a few HT s including linear, , bull-horn-shaped, , helical, , and wave-shaped molecular skeletons (Figure ) have been constructed by the C–C bond coupling between the α–α or β–β positions of two DTT s and subsequent cyclization.…”