Synthesis and Field-Effect Transistor Application of -Extended Lactam-Fused Conjugated Oligomers obtained by Tandem Direct Arylation

Five -extended lactam-fused conjugated oligomers (5FO, 5FS, 4FPO, 4FPS, and R-4FPO) were synthesized by the tandem direct arylation. The intermolecular oxidative direct arylation was applied in the second step. These conjugated oligomers had fine-tuned FMO energies predictable by the theoretical calculation and excellent thermal stabilities. 4FPO and 4FPS bearing tetrafluoropyridine exhibited lower LUMO energy levels (-3.20eV and -3.39eV, respectively) compared with others. Based on the X-ray crystallography, 4FPO was found to have a herringbone crystal packing and a considerably large electron transfer integral value (137meV). 4FPO-based bottom-gate, bottom-contact FET device demonstrated an electron mobility of 5.2x10(-3)cm(2)V(-1)s(-1) as a result of an edge-on alignment on the SiO2 substrate.