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

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GaN nanowires as a reusable photoredox catalyst for radical coupling of carbonyl under blacklight irradiation
Chemical Science ( IF 7.6 ) Pub Date : 2020-07-01 , DOI: 10.1039/d0sc02718a
Mingxin Liu _{1,

2} , Lida Tan ₁ , Roksana T Rashid ₃ , Yunen Cen ₁ , Shaobo Cheng ₄ , Gianluigi Botton ₄ , Zetian Mi _{2,

3} , Chao-Jun Li ₁

Affiliation

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.

中文翻译：

GaN纳米线作为可重复使用的光氧化还原催化剂，用于黑光照射下羰基的自由基偶联

利用光能来驱动所需的化学转化一直是一个长期追求的课题。然而，自由基偶联反应中均相光氧化还原催化剂的发展确实是惊人的，但也存在明显的缺点，例如催化剂分离困难以及经常需要稀有的贵金属。因此，我们设想使用具有可调费米能级和能带的超稳定 III-V 族光敏半导体作为易于分离和可回收的异质光氧化还原催化剂，用于自由基偶联反应。使用羰基偶联反应作为概念验证，本文报告了 GaN 纳米线在室温下环境光下，以甲醇作为溶剂和牺牲剂催化的光频哪醇偶联反应。通过简单地调整掺杂剂，GaN 纳米线显示出显着增强的电子性能。该催化剂表现出优异的稳定性、可重复使用性和功能耐受性。所有反应都可以通过硅晶圆上的单条纳米线来完成。

更新日期：2020-08-05

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