A series of different metal centered 5,15-Bis(4-aminophenyl)-10,20-bis(4-bromophenyl)porphyrins (PorM) where M = H₂, MnOAc, FeCl, Co or Zn were synthesized, and then encapsulated in zeolite imidazole framework-8 (ZIF-8) by typical template directed strategy to generate PorM@ZIF-8 metal organic frameworks (MOFs). These composites were characterized by UV-vis, FTIR, XRD, FESEM and HRTEM methods. Each prepared PorM@ZIF-8 MOF retained the molecular structure of porphyrin and crystal structure of ZIF-8. It is clearly shown that porphyrin centered metal ions will affect MOFs morphology. Both PorH₂@ZIF-8 and PorZn@ZIF-8 gave a rhombic dodecahedron, PorMnOAc@ZIF-8 gave a truncated hexagonal prism-like structure, while no specific structures were obtained for PorFeCl@ZIF-8 and PorCo@ZIF-8 due to aggregation as characterized by FESEM spectrum. Oxygen reduction catalytic ability of ZIF-8, PorM and PorM@ZIF-8 were measured in alkaline condition (0.1 M KOH) with the number of electrons transferred being n = 2.20–2.60 and generating HO2− as the oxygen reduction product. The catalytic property slightly increased after the porphyrin was encapsulated, due possibly to the capacity limit, inappropriate molecular distance or the direction of encapsulated porphyrin molecular.

中文翻译：

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卟啉金属中心对卟啉包覆金属有机骨架合成、结构、形貌及氧还原性能的影响

合成了一系列不同的金属中心 5,15-双(4-氨基苯基)-10,20-双(4-溴苯基)卟啉 (PorM)，其中 M = H ₂、MnOAc、FeCl、Co 或 Zn，然后封装通过典型的模板导向策略在沸石咪唑骨架 8 (ZIF-8) 中生成 PorM@ZIF-8 金属有机骨架 (MOF)。这些复合材料通过UV-vis、FTIR、XRD、FESEM和HRTEM方法进行了表征。每个制备的 PorM@ZIF-8 MOF 都保留了卟啉的分子结构和 ZIF-8 的晶体结构。清楚地表明，以卟啉为中心的金属离子会影响 MOFs 的形态。两个 PorH ₂@ZIF-8 和 PorZn@ZIF-8 为菱形十二面体，PorMnOAc@ZIF-8 为截头六角棱柱状结构，而 PorFeCl@ZIF-8 和 PorCo@ZIF-8 由于聚集而没有获得特定结构由 FESEM 光谱表征。ZIF-8、PorM和PorM@ZIF-8的氧还原催化能力在碱性条件（0.1 M KOH）下测定，转移的电子数为n= 2.20–2.60 并产生 H2O2-作为氧还原产物。卟啉被包封后催化性能略有提高，这可能是由于容量限制、分子距离不当或被包封的卟啉分子方向不合适。