| Autor: |
Mao C; Materials Science and Engineering Program and ‡Department of Chemistry, University of California , Riverside, California 92521, United States., Kudla RA, Zuo F, Zhao X, Mueller LJ, Bu X, Feng P |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of the American Chemical Society [J Am Chem Soc] 2014 May 28; Vol. 136 (21), pp. 7579-82. Date of Electronic Publication: 2014 May 16. |
| DOI: |
10.1021/ja5030723 |
| Abstrakt: |
Metal-organic frameworks (MOFs) with cationic frameworks and mobile anions have many applications from sensing, anion exchange and separation, to fast ion conductivity. Despite recent progress, the vast majority of MOFs have neutral frameworks. A common mechanism for the formation of neutral frameworks is the attachment of anionic species such as F(-) or OH(-) to the framework metal sites, neutralizing an otherwise cationic scaffolding. Here, we report a general method capable of converting such neutral frameworks directly into cationic ones with concurrent generation of mobile anions. Our method is based on the differential affinity between distinct metal ions with framework anionic species. Specifically, Al(3+) is used to strip F(-) anions away from framework Cr(3+) sites, leading to cationic frameworks with mobile Cl(-) anions. The subsequent anion exchange with OH(-) further leads to a porous network with mobile OH(-) anions. New materials prepared by anion stripping can undergo ion exchange with anionic organic dyes and also exhibit much improved ionic conductivity compared to the original unmodified MOFs. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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