摘要
A highly efficient and eco-friendly protocol for the synthesis of an alternating copolymer poly(7,7'-diazaisoindigo-alt-(E)-1,2- bis(3,4-difluorothien-2-yl)ethene)(PAIID-4FTVT) via direct arylation polycondensation (DArP) is presented. Through detailed study, we found that the inhibitory effect of 7,7'-diazaisoindigo on DArP stemmed from the coordination of N atom with catalyst can be overcome by using dimethylacetamide (DMAc) as the co-solvent. Thus, PAIID-4FTVT with number-average molecular weight (Mn)>100kDa was synthesized via DArP by optimizing the content of DMAc. Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectroscopy revealed that PAIID-4FTVT was defect-free. Top gate and bottom contact (TG/BC) organic thin-film transistors (OTFTs) were fabricated to characterize the semiconducting properties of the polymers. PAIID-4FTVT displayed unipolar n-type characteristics with the electron mobility (μe) strongly dependent on Mn. The highest μe up to 0.25 cm^2·V^-1 s^-1 was achieved with the high molecular weight sample.
A highly efficient and eco-friendly protocol for the synthesis of an alternating copolymer poly（7,7’-diazaisoindigo-alt-（E）-1,2-bis（3,4-difluorothien-2-yl）ethene）（PAIID-4FTVT） via direct ary lation poly condensation （DArP） is presented.Through detailed study,we found that the inhibitory effect of 7,7’-diazaisoindigo on DArP stemmed from the coordination of N atom with catalyst can be overcome by using dimethylacetamide （DMAc） as the co-solvent.Thus,PAIID-4FTVT with number-average molecular weight （Mn）> 100 kDa was synthesized via DArP by optimizing the content of DMAc.Matrix-assisted laser desorption ionization time-of-flight （MALDI-TOF） mass spectroscopy revealed that PAIID-4FTVT was defect-free.Top gate and bottom contact （TG/BC） organic thin-film transistors （OTFTs）were fabricated to characterize the semiconducting properties of the polymers.PAIID-4FTVT displayed unipolar n-type characteristics with the electron mobility （μe） strongly dependent on Mn.The highestμe up to 0.25 cm2·V-1·s-1 was achieved with the high molecular weight sample.
基金
financially supported by the National Key R&D Program of “Strategic Advanced Electronic Materials” (No. 2016YFB0401101) of the Chinese Ministry of Science and Technology
the National Natural Science Foundation of China (No. 51333006)
