What is the impact of the quinoidal character of TQBT on the electronic properties of the resulting polymers?

Label:chem

Topic
The quinoidal character in conjugated polymers can influence electronic properties such as bandgap and charge transport.
Answer
The quinoidal character of TQBT leads to a highly planar and rigid conjugated backbone, which minimizes bond length alternation and enhances charge transport. This results in lower HOMO and LUMO energy levels compared to analogous polymers without the quinoidal unit. The bandgap trend of TQBT-based polymers is opposite to that of conventional donor-acceptor polymers, confirming the quinoidal character. This unique electronic structure contributes to the high hole mobility and operational stability observed in OFET devices based on these polymers.
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