Abstract
Donor–acceptor (D-A) type of new constituted diketopyrrolopyrrole-based polymers, PDPP-EDOT (poly A), PDPP-TP (poly B), and PDPP-EBTE (poly C), were synthesized by one-pot direct C–H heteroarylation polymerization methodology supported by Pd(OAc)2/Bu4NBr catalytic system. C–H heteroarylation coupling of highly selective sites avoided the difficulty of the synthesis using organometallic reagent and gave highly pure polymers in good yields. The targeted polymers were evaluated using NMR, TGA, DSC, UV–VIS absorption, GPC, and electrochemical cyclic voltammetry. The polymers are soluble in most of organic solvents, and TGA studies show their high thermally stability. Polymers bandgaps are tuned by alternative copolymerizing with different electron-donating and/or electron-withdrawing units. UV–VIS absorption spectra demonstrated that the polymers show excellent light absorption, with narrow optical bandgaps, around 1.20 eV, confirmed by cyclic voltammetry parameters. All of these promising properties indicated that they might be excellent polymeric materials for polymer solar cells, organic field effect transistors, and so on.
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Acknowledgements
This research was supported by the Egyptian Japanese Educational Partnership (EJEP) Fellowship, 2019. The author wishes to thank the Laboratory for Photofunctional Organic Chemistry at Nara Institute of Science and Technology for the assistance to complete this project.
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Shaker, M. Comparative study of the optoelectronic properties of diketopyrrolopyrrole based polymers obtained by direct C-H arylation. Polym. Bull. 79, 829–842 (2022). https://doi.org/10.1007/s00289-021-03539-7
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DOI: https://doi.org/10.1007/s00289-021-03539-7