Probing Gas Adsorption in Metal–Organic Framework ZIF-8 by EPR of Embedded Nitroxides
| Autor: | Alena M. Sheveleva, Alexander G. Stepanov, Artem S. Poryvaev, A. V. Anikeenko, Daniil I. Kolokolov, Inna K. Shundrina, Matvey V. Fedin, Diana L. Kuzmina |
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| Rok vydání: | 2017 |
| Předmět: |
Nitroxide mediated radical polymerization
Chemistry Radical Sorption 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention General Energy Adsorption law Molecule Organic chemistry Metal-organic framework Gas separation Physical and Theoretical Chemistry 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | The Journal of Physical Chemistry C. 121:19880-19886 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Metal–organic frameworks (MOFs) are being increasingly considered as promising materials for gas separation and storage, yet specific interactions between gas molecules and the inner surface of pores are still not well understood. In this work, we propose a new approach for investigation of such interactions by Electron Paramagnetic Resonance (EPR). We use stable nitroxide radicals as multifunctional agents embedded into the pores of a MOF prior to the gas sorption. They act as EPR-active reporters, and simultaneously as competitor molecules during the gas adsorption process. We exemplify this approach using a ZIF-8 framework, nitroxide TEMPO ((2,2,6,6-tetramethylpiperidin-1-yl)oxyl), and CO2, N2, and O2 gases. The mobility of nitroxide monitored by continuous wave EPR behaves differently upon adsorption of each of these gases. In particular, a noticeable increase of mobility in the presence of CO2 reveals the weakening of guest–host interactions TEMPO–MOF induced by CO2, which was qualitatively supported... |
| Databáze: | OpenAIRE |
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