Abstract
Thanks to their unique properties (improved volume-to-surface ratio compared to heterogeneous catalysts, highcatalytic performance and selectivity…), nanocatalysts[1] are increasingly used for environmental remediation[2] toremove organic pollutants as well as for oxidation-reduction processes and C-C couplings in organic synthesis.[3]Pi-conjugated molecules, which are employed for electronic organic applications, are heavily reliant on palladiumcatalyzed C-C or C-heteroatom couplings for their preparation. Traditional conditions for the catalytic steps usuallyinvolve high metal loadings, harmful solvents, and long reaction times at high temperatures.[4,5,6] To improve theenvironmental footprint of the preparation of these materials and the devices in which they are applied,nanocatalysis is a very valuable tool.We prepared novel Pd/Pt bimetallic nanoparticles stabilized by a bisphosphonic ligand. The nanoparticles wereevaluated in classical Suzuki and Sonogashira coupling reactions. They showed a high catalytic activity and couldbe used in green conditions: low catalyst loading, green solvent, and short reaction time under microwaveactivation. These new nanocatalysts were then applied to the preparation of pi-conjugated materials by the Suzukicoupling of a dibenzofuran or dibenzothiophene core with triarylamine moieties (Figure 1). These pi-conjugatedmaterials were studied as efficient hole transporting materials (HTM = materials that can extract the positive chargethat appears after a photon absorption) in perovskite solar cells (Figure 2).[7]