A Fast and Convenient Synthesis of Heterocycle-Based Polymers via Infrared Irradiation-Assisted Direct C-H Bond
Gianfranco Decandia1, Gianluigi Albano1, Katarina Gugujonović2
1Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, Via Edoardo Orabona 4, 70126 Bari, Italy.
None:
The first synthesis of π-conjugated polymers for organic solar cells (OSCs) via infrared (IR) irradiation-assisted Pd-catalyzed direct C-H bond arylation polymerization (DArP) is reported. Reactions have been carried out under air and nonanhydrous conditions, in the presence of a very small amount (only 3.0 equiv) of cyclopentyl methyl ether (CPME). Donor-acceptor (D-A) heteroaryl-based π-conjugated polymers having different structures have been obtained in short reaction time. A more detailed investigation has been carried out for the donor polymer PBDB-T: three batches, synthesized via IR irradiation-assisted DArP and, for two of them, subjected to end-capping reactions, were tested in organic solar cells (OSCs), achieving maximum power conversion efficiency (PCE) of 4.8% in non-optimized device, which is comparable to commercially available PBDB-T used as reference (5.9%). Our results confirm that the experimental advantages of DArP reactions combined with the use of IR irradiation and the quasi-solvent-free conditions represent a straightforward and sustainable route to heterocycle-based polymers for organic solar cells.
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