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

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.

Porous and Water Stable 2D Hybrid Metal Halide with Broad Light Emission and Selective H2O Vapor Sorption

“…In the case of 2D (PA) 2 (MA) n−1 Pb n I 3n+1 (n=1–5, PA=CH 3 (CH 2 ) 4 NH 3 + ) and (HA) 2 (MA) n−1 Pb n I 3n+1 (n=1–4, HA=CH 3 (CH 2 ) 5 NH 3 + ), increasing the carbon‐chain number from four (C4) to six (C6) carbon atoms leads to a gradual increase in the hydrophobicity of the structure, demonstrated by the increase of the water contact angle from 36.50° for MAPbI 3 ‐based thin films to 79.20° for hexylammonium‐based films [41] . Evidently, further increase of the carbon chain length to sixteen (C16) renders the material water‐stable for 30 minutes as in the case of (HAD) 2 PbI 4 (HAD=hexadecylammonium) [42] . Despite the immense efforts for the acquisition of water‐stable perovskite and metal halide materials, few compounds have been reported.…”

Recent Progress in Designing Halide-Perovskite-Based System for the Photocatalytic Applications

“…The reaction runs in two directions (Figure 17B): (I) Indoline-2carboxylic acid undergo decarboxylation to form indoline under N 2 . (II) Both decarboxylation and dehydrogenation to indole in the presence of O 2 (Hong et al, 2019).…”