Hydrophobic Metal Halide Perovskites for Visible‐Light Photoredox C−C Bond Cleavage and Dehydrogenation Catalysis

Water repellent and light: Hydrophobic 2D Pb and Sn halide perovskites were synthesized under ambient conditions by solution‐based methods and showed contact angles over 90° as well as dispersibility and photoluminescence in water, thus highlighting their hydrophobic behavior. The perovskites were also effective photocatalysts for visible‐light‐driven redox‐neutral decarboxylation and oxidative dehydrogenation reactions.

Abstract

Two‐dimensional lead and tin halide perovskites were prepared by intercalating the long alkyl group 1‐hexadecylammonium (HDA) between the inorganic layers. We observed visible‐light absorption, narrow‐band photoluminescence, and nanosecond photoexcited lifetimes in these perovskites. Owing to their hydrophobicity and stability even in humid air, we applied these perovskites in the decarboxylation and dehydrogenation of indoline‐2‐carboxylic acids. (HDA)₂PbI₄ or (HDA)₂SnI₄ were investigated as photoredox catalysts for these reactions, and quantitative conversion and high yields were observed with the former.

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