Straightforward access to diketopyrrolopyrrole (DPP) dimers

Synthesis, isolation and characterization of diketopyrrolopyrrole (DPP) dimers are described. These derivatives were prepared starting from symmetric or asymmetric DPP monomers through Pd-catalyzed homocoupling, Yamamoto coupling or Suzuki coupling. The spectroscopic properties of these newly synthesized DPP dimers were investigated and were supported by quantum-chemical calculations.

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► Synthesis and full characterization of eight soluble N,N-dialkylated DPP dimers.
► Organometallic couplings of dissymmetric and symmetric DPP intermediates.
► Dimers are candidates for OPV cells due to strong absorption between 520 and 725 nm.