posted on 2023-10-31, 19:45authored byFang-Liang Dong, Yu Zhang, Huan Wei, Chang Li, Zheng Li, Jiaxing Gao, Yuanyuan Hu, Zheng Tang, Ming Wang
A building block of thieno[3,2-c]pyridine-4,6-dione-derived
isoindigo (TPyI) was designed and synthesized. TPyI has a planar structure
with strong S···O noncovalent interactions according
to both quantum chemistry simulations and single-crystal structure
information. Two TPyI-based D–A polymers, including regioirregular
and regioregular versions (ri-PTPyI2T and rr-PTPyI2T), were synthesized since TPyI is geometrically
asymmetrical. The polymer thin films exhibited narrow bandgaps of
approximately 1.19 eV and p-type charge transport characteristics,
with maximum hole mobilities of 0.14 cm2/(V s) for ri-PTPyI2T and 0.32 cm2/(V s) for rr-PTPyI2T, respectively. This study highlights the design and synthesis
of TPyI-based narrow band gap-conjugated polymers that are promising
for organic electronics.