AgPO Enables the Generation of Long-lived Radical Cations for Visible Light-driven [2 + 2] and [4 + 2] Pericyclic Reactions

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Feb 1

PMID 38302484

Authors

Lirong Guo

Rongchen Chu

Xinyu Hao

Yu Lei

Haibin Li

Dongge Ma

Guo Wang

Chen-Ho Tung

Yifeng Wang

Affiliations

Soon will be listed here.

Abstract

Photocatalytic redox reactions are important for synthesizing fine chemicals from olefins, but the limited lifetime of radical cation intermediates severely restricts semiconductor photocatalysis efficiency. Here, we report that AgPO can efficiently catalyze intramolecular and intermolecular [2 + 2] and Diels-Alder cycloadditions under visible-light irradiation. The approach is additive-free, catalyst-recyclable. Mechanistic studies indicate that visible-light irradiation on AgPO generates holes with high oxidation power, which oxidize aromatic alkene adsorbates into radical cations. In photoreduced AgPO, the conduction band electron (e) has low reduction power due to the delocalization among the Ag-lattices, while the particle surfaces have a strong electrostatic interaction with the radical cations, which considerably stabilize the radical cations against recombination with e. The radical cation on the particle's surfaces has a lifetime of more than 2 ms, 75 times longer than homogeneous systems. Our findings highlight the effectiveness of inorganic semiconductors for challenging radical cation-mediated synthesis driven by sunlight.

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