Chemistry

Red light-driven electron sacrificial agents-free photoreduction of inert aryl halides via triplet-triplet annihilation

L. Zeng, L. Huang, et al.

Discover an innovative method for the photoreduction of aryl bromides and chlorides using 656 nm LED light through a triplet-triplet annihilation strategy. This cutting-edge research conducted by Le Zeng, Ling Huang, Wenhai Lin, Lin-Han Jiang, and Gang Han showcases a metal-free photocatalyst, perylene, and a red light-absorbing photosensitizer, PdTPBP, optimizing yields even in large-scale reactions.

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Abstract

This paper reports a novel method for the photoreduction of aryl bromides/chlorides using 656 nm LED light via a triplet-triplet annihilation (TTA) strategy. The method utilizes perylene as a metal-free photocatalyst, eliminating the need for electron sacrificial agents. A red light-absorbing photosensitizer, meso-tetraphenyl-tetrabenzoporphine Palladium complex (PdTPBP), is introduced to enable long-wavelength red light activation. Restricting the rotational freedom of the phenyl moiety in perylene derivatives enhances TTA efficiency and improves the photoreduction yield, even in large-scale reactions.

Publisher

Nature Communications

Published On

Feb 27, 2023

Authors

Le Zeng, Ling Huang, Wenhai Lin, Lin-Han Jiang, Gang Han

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