Electro- and photoactivation of silver-iron oxide particles as magnetically recyclable catalysts for cross-coupling reactions.
Electro- and photoactivation of silver-iron oxide particles as magnetically recyclable catalysts for cross-coupling reactions.
复制标题
银铁氧化物颗粒的电活化和光活化作为交叉偶联反应的磁性可回收催化剂。
DOI：
10.1039/d2nr04629f
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发表时间：
2023
期刊：
影响因子：
6.7
通讯作者：
Wei,Alexander
中科院分区：
文献类型：
--
作者：
Wang,Qi;Shang,Zhongxia;Wang,Haiyan;Wei,Alexander
用Fe3O4岛修饰的银胶粒子可以被电化学或光化学活化作为C（sp2）-H杂芳基化反应的反催化剂。银-铁氧化物（SIO）颗粒通过在温和电位下的阴极充电或通过短期光暴露被还原成氧化还原活性形式，并且可以通过磁循环重复使用多次而无需进一步活化。还原峰的负移归因于表面Fe3O4产生的过电位，该过电位将残留的Ag离子或团簇从体银中分离。SIO的催化效率即使在酸降解的情况下也能保持，这可以简单地通过向反应介质中加入水来抵消。
Colloidal Ag particles decorated with Fe3O4 islands can be electrochemically or photochemically activated as inverse catalysts for C(sp2)–H heteroarylation. The silver–iron oxide (SIO) particles are reduced into redox-active forms by cathodic charging at mild potentials or by short-term light exposure, and can be reused multiple times by magnetic cycling without further activation. A negative shift in the reduction peak is attributed to an overpotential produced by surface Fe3O4 which separates residual Ag ions or clusters from bulk silver. The catalytic efficiency of SIO is maintained even with acid degradation, which can be countered simply by adding water to the reaction medium.