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Issue 30, 2020
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GaN nanowires as a reusable photoredox catalyst for radical coupling of carbonyl under blacklight irradiation

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Abstract

Employing photo-energy to drive the desired chemical transformation has been a long pursued subject. The development of homogeneous photoredox catalysts in radical coupling reactions has been truly phenomenal, however, with apparent disadvantages such as the difficulty in separating the catalyst and the frequent requirement of scarce noble metals. We therefore envisioned the use of a hyper-stable III–V photosensitizing semiconductor with a tunable Fermi level and energy band as a readily isolable and recyclable heterogeneous photoredox catalyst for radical coupling reactions. Using the carbonyl coupling reaction as a proof-of-concept, herein, we report a photo-pinacol coupling reaction catalyzed by GaN nanowires under ambient light at room temperature with methanol as a solvent and sacrificial reagent. By simply tuning the dopant, the GaN nanowire shows significantly enhanced electronic properties. The catalyst showed excellent stability, reusability and functional tolerance. All reactions could be accomplished with a single piece of nanowire on Si-wafer.

Graphical abstract: GaN nanowires as a reusable photoredox catalyst for radical coupling of carbonyl under blacklight irradiation

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Supplementary files

Article information


Submitted
12 May 2020
Accepted
30 Jun 2020
First published
01 Jul 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 7864-7870
Article type
Edge Article

GaN nanowires as a reusable photoredox catalyst for radical coupling of carbonyl under blacklight irradiation

M. Liu, L. Tan, R. T. Rashid, Y. Cen, S. Cheng, G. Botton, Z. Mi and C. Li, Chem. Sci., 2020, 11, 7864
DOI: 10.1039/D0SC02718A

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