Organic ligands of MIL-101(Fe)-X served as light-absorbing “antennae,” as depicted in the Figure. Photoexcited electrons and holes are produced when light shines on the catalyst due to the π-π conjugation effect of the ligands. The amino group exhibits electron-donating behavior by transferring its lone pair electrons to the benzene ring, thereby enhancing the electron density on the benzene ring. This process enables the efficient transfer of photoexcited electrons to Fe-O metal clusters, where they undergo a reaction with the electron sacrificial agent Ag. Meanwhile, the ligands functioned as oxidation centers, facilitating the oxidation of water to produce O through the photoexcited holes.

中文翻译：

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具有侧链氨基取代基的铁基纳米多孔金属有机框架用于效率调节的析氧反应

MIL-101(Fe)-X 的有机配体充当光吸收“天线”，如图所示。当光照射到催化剂上时，由于配体的π-π共轭效应，产生光生电子和空穴。氨基通过将其孤对电子转移到苯环上而表现出给电子行为，从而增强苯环上的电子密度。该过程能够将光生电子有效转移到 Fe-O 金属簇，并与电子牺牲剂 Ag 发生反应。同时，配体作为氧化中心，促进水通过光激发空穴氧化产生O。