Research Progress in Design, Synthesis and Application for Quinoidal Heterocyclic Compounds

Quinoidal heterocyclic (thiophene, pyrrole, furan, etc.) molecules have the characteristics of rigid backbone, low highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) level, narrow band gap and high molar extinction coefficient, and so on.Because of their planar structures, quinoidal molecules usually have strong intermolecular charge transfer ability due to the strong intermolecular interaction.Up to now, quinoidal heterocyclic molecules have become a research hotspot in the field of organic semiconductor materials, especially in the field of organic field effect transistors.According to the structural features of quinoidal heterocyclic molecules and the classification basis of terminal groups, the research progress of quinoidal heterocyclic compounds in molecular design, synthesis and application in recent years is reviewed, and the development of quinoidal heterocyclic molecules is prospected.