The reduction of nitrogen-containing heterocyclic compounds in aqueous medium under mild condition is quite challenging. In view of metal–organic frameworks (MOFs) possess adjustable pore size and modifiable organic linkers, MOFs could be used in heterogeneous catalysis. Herein, Three Nano-Ni-MOFs, MOF-74-Ni, MOF-69-Ni, and Ni–NH2 (constructed from similar ligands and Ni2+ ions) are introduced for hydrogenating of azacyclo-compounds. As expected, Ni–NH2 shows outstanding activity of hydrogenation of quinoline under mild conditions, due to the moderate pore size and the modified –NH2 function group, which makes the substrate anchored on the surface of the framework facilitate the following catalysis process. Theoretical calculations identified that the –NH2 group at the catalyst facilitates the H2 heterolytic dissociation for the hydrogenation reactions. Compared to MOF-74-Ni and MOF-69-Ni, the catalyst of Ni–NH2 shows outstanding activity of hydrogenation of quinoline, due to the modified –NH2 function group which makes the substrate anchored on the surface of the framework facilitate the following catalysis process

中文翻译：

---

Nano-Ni-MOFs：喹啉级联氢化的高活性催化剂

在温和条件下在水性介质中还原含氮杂环化合物是相当具有挑战性的。鉴于金属有机骨架 (MOF) 具有可调节的孔径和可改性的有机连接体，MOF 可用于多相催化。在此，引入了三种纳米 Ni-MOF，MOF-74-Ni、MOF-69-Ni 和 Ni-NH2（由相似的配体和 Ni2+ 离子构成）用于氮杂环化合物的氢化。正如预期的那样，Ni-NH2 在温和条件下表现出出色的喹啉加氢活性，这是由于其适中的孔径和修饰的 -NH2 官能团，这使得固定在框架表面的底物促进了后续的催化过程。理论计算表明，催化剂上的 –NH2 基团促进了氢化反应的 H2 异解离解。与 MOF-74-Ni 和 MOF-69-Ni 相比，Ni-NH2 催化剂表现出优异的喹啉加氢活性，这是由于修饰的 -NH2 官能团使固定在框架表面的底物促进了以下反应催化过程