Investigation of Ionic Liquid interaction with ZnBDC-Metal Organic Framework through Scanning EXAFS and Inelastic Neutron Scattering
| Autor: | Mala N. Rao, Rituraj Dutta, Ashok Kumar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
chemistry.chemical_element lcsh:Medicine 02 engineering and technology Zinc 010402 general chemistry 01 natural sciences Inelastic neutron scattering Article chemistry.chemical_compound X-ray photoelectron spectroscopy Structure of solids and liquids Organic-inorganic nanostructures lcsh:Science Coordination geometry Multidisciplinary Extended X-ray absorption fine structure lcsh:R 021001 nanoscience & nanotechnology XANES 0104 chemical sciences Neutron spectroscopy chemistry Ionic liquid Physical chemistry lcsh:Q 0210 nano-technology |
| Zdroj: | Scientific Reports Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019) |
| ISSN: | 2045-2322 |
| Popis: | Zn based Metal-Organic Framework (MOF), Zinc 1,4-benzenedicarboxylate (ZnBDC) has been synthesized and incorporated with ionic liquid (IL) 1-butyl-3 methylimidazolium bromide (BMIMBr) at optimum 50 wt% of IL. Interaction of BMIMBr in the micropores of ZnBDC-MOF is investigated by XPS, scanning EXAFS and inelastic neutron spectroscopy. Significant increase in binding energies of Zn spin-orbit peaks upon IL incorporation is observed from XPS spectra indicating motion of Br− anions of the IL BMIMBr towards the unsaturated Zn cluster of ZnBDC-MOF. The k-space periodicity as well as the local coordination geometry of Zn K-edge is investigated from the scanning EXAFS and XANES spectra. Asymmetric oscillation periodicity has been observed from the k-space scanning XANES spectra upon IL incorporation. Difference in peak positions of oxygen and zinc are observed from the R-space scanning EXAFS spectra suggesting change in coordination geometry due to dehydration of Zn2+ ion in the ZnBDC-MOF upon IL incorporation. Incorporation of IL in the pores of ZnBDC-MOF gives rise to increased scattering intensity in the Inelastic Neutron Scattering (INS) spectra, which is attributed to the displacement of IL ions in the MOF pores. |
| Databáze: | OpenAIRE |
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