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A Comparison of Two Isoreticular Metal–Organic Frameworks with Cationic and Neutral Skeletons: Stability,Mechanism, and Catalytic Activity |
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| Authors: | Ge Huang Prof Li Yang Qi Yin Zhi-Bin Fang Xiao-Jing Hu An-An Zhang Prof Jun Jiang Prof Tian-Fu Liu Prof Rong Cao |
| Institution: | 1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzho, Fujian, 350002 P. R. China;2. Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China
Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui, 230601 P. R. China;3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzho, Fujian, 350002 P. R. China University of the Chinese Academy of Sciences, Beijing, P. R. China;4. Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026 P. R. China |
| Abstract: | Although many ionic metal–organic frameworks (MOFs) have been reported, little is known about how the charge of the skeleton affects the properties of the MOF materials. Herein we report how the chemical stability of MOFs can be substantially improved through embedding electrostatic interactions in structure. A MOF with a cationic skeleton is impervious to extremely acidic, oxidative, reductive, and high ionic strength conditions, such as 12 m HCl (301 days), aqua regia (86 days), H2O2 (30 days), and seawater (30 days), which is unprecedented for MOFs. DFT calculations suggested that steric hinderance and the repulsive interaction of the cationic framework toward positively charged species in microenvironments protects the vulnerable bonds in the structure. Diverse functionalities can be bestowed by substituting the counterions of the charged framework with identically charged functional species, which broadens the horizon in the design of MOFs adaptable to a demanding environment with specific functionalities. |
| Keywords: | Ameisensäure-Dehydrierung Elektrostatische Wechselwirkungen Heterogene Katalyse Metall-organische Gerüste (MOFs) Stabilität |