An efficient lactone-to-lactam conversion for the synthesis of thiophene Pechmann lactam and the characterization of polymers thereof

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Polymer Chemistry, ISSN: 1759-9962, Vol: 9, Issue: 42, Page: 5234-5241

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Kyu Cheol Lee; So Huei Kang; Jungho Lee; Changduk Yang; Hae Rang Lee; Joon Hak Oh; Young IL Park; Seung Man Noh
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Chemical Engineering; Biochemistry, Genetics and Molecular Biology; Materials Science; Chemistry
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Despite having unique structural features, e.g., high co-planarity and a strong polar bicyclic lactam structure, thiophene bipyrrolylidene-2,2′(1H,1′H)-dione (TBPD) has been less explored as a dye, mainly due to the quite low yield in its synthesis via lactone-to-lactam conversion. We reported an efficient methodology for synthesizing TBPD in high yield using p-toluenesulfonic acid monohydrate and a catalytic amount of 4-dimethylaminopyridine in the chloroform solvent. From the newly synthesized series of TBPD-based donor-acceptor-type polymers, we fabricated organic field-effect transistors (OFETs), which were subjected to a systematic study on the relationship between film microstructure and charge transport. Among them, the annealed PTBPD-Th film revealed a more ordered lamellar packing with the highest number of interlayers and preferential edge-on orientation, yielding the best hole mobility (up to 0.46 cm V s). The improved synthesis of TBPD and our findings concerning related polymers could promote further research and development associated with the TBPD unit.