Advanced search
2 files | 6.67 MB

Multi-frequency (S, X, Q and W-band) EPR and ENDOR study of vanadium (IV) incorporation in the aluminium metal-organic framework MIL-53

(2015) CHEMPHYSCHEM. 16(14). p.2968-2973
Author
Organization
Abstract
Doping the well-known metal-organic framework MIL-53(Al) with vanadium(IV) ions leads to significant changes in the breathing behaviour and might have repercussions on the catalytic behaviour as well. To understand the properties of such a doped framework, it is necessary to determine where dopant ions are actually incorporated. Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are applied to reveal the nearest environment of the paramagnetic vanadium(IV) dopant ions. EPR spectra of as-synthesised vanadium-doped MIL-53 are recorded at S-, X-, Q- and W-band microwave frequencies. The EPR spectra suggest that at low dopant concentrations (1.0-2.6 mol%) the vanadium(IV) ions are well dispersed in the matrix. Varying the vanadium dopant concentration within this range or the dopant salt leads to the same dominant EPR component. In the ENDOR spectra, hyperfine (HF) interactions with H-1, Al-27 and V-51 nuclei are observed. The HF parameters extracted from simulations strongly suggest that the vanadium(IV) ions substitute Al in the framework.
Keywords
ENDOR spectroscopy, EPR spectroscopy, doping, vanadium, metal-organic frameworks, ELECTRON-PARAMAGNETIC-RESONANCE, ADSORPTION, HYSTERESIS, COMPOUND, SOLIDS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 3.29 MB
  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 3.38 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Nevjestic, Irena, Hannes Depauw, Karen Leus, Vidmantas Kalendra, Ignacio Caretti, Gunnar Jeschke, Sabine Van Doorslaer, Freddy Callens, Pascal Van Der Voort, and Henk Vrielinck. 2015. “Multi-frequency (S, X, Q and W-band) EPR and ENDOR Study of Vanadium (IV) Incorporation in the Aluminium Metal-organic Framework MIL-53.” Chemphyschem 16 (14): 2968–2973.
APA
Nevjestic, I., Depauw, H., Leus, K., Kalendra, V., Caretti, I., Jeschke, G., Van Doorslaer, S., et al. (2015). Multi-frequency (S, X, Q and W-band) EPR and ENDOR study of vanadium (IV) incorporation in the aluminium metal-organic framework MIL-53. CHEMPHYSCHEM, 16(14), 2968–2973.
Vancouver
1.
Nevjestic I, Depauw H, Leus K, Kalendra V, Caretti I, Jeschke G, et al. Multi-frequency (S, X, Q and W-band) EPR and ENDOR study of vanadium (IV) incorporation in the aluminium metal-organic framework MIL-53. CHEMPHYSCHEM. 2015;16(14):2968–73.
MLA
Nevjestic, Irena, Hannes Depauw, Karen Leus, et al. “Multi-frequency (S, X, Q and W-band) EPR and ENDOR Study of Vanadium (IV) Incorporation in the Aluminium Metal-organic Framework MIL-53.” CHEMPHYSCHEM 16.14 (2015): 2968–2973. Print.
@article{6972624,
  abstract     = {Doping the well-known metal-organic framework MIL-53(Al) with vanadium(IV) ions leads to significant changes in the breathing behaviour and might have repercussions on the catalytic behaviour as well. To understand the properties of such a doped framework, it is necessary to determine where dopant ions are actually incorporated. Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are applied to reveal the nearest environment of the paramagnetic vanadium(IV) dopant ions. EPR spectra of as-synthesised vanadium-doped MIL-53 are recorded at S-, X-, Q- and W-band microwave frequencies. The EPR spectra suggest that at low dopant concentrations (1.0-2.6 mol\%) the vanadium(IV) ions are well dispersed in the matrix. Varying the vanadium dopant concentration within this range or the dopant salt leads to the same dominant EPR component. In the ENDOR spectra, hyperfine (HF) interactions with H-1, Al-27 and V-51 nuclei are observed. The HF parameters extracted from simulations strongly suggest that the vanadium(IV) ions substitute Al in the framework.},
  author       = {Nevjestic, Irena and Depauw, Hannes and Leus, Karen and Kalendra, Vidmantas and Caretti, Ignacio and Jeschke, Gunnar and Van Doorslaer, Sabine and Callens, Freddy and Van Der Voort, Pascal and Vrielinck, Henk},
  issn         = {1439-4235},
  journal      = {CHEMPHYSCHEM},
  keyword      = {ENDOR spectroscopy,EPR spectroscopy,doping,vanadium,metal-organic frameworks,ELECTRON-PARAMAGNETIC-RESONANCE,ADSORPTION,HYSTERESIS,COMPOUND,SOLIDS},
  language     = {eng},
  number       = {14},
  pages        = {2968--2973},
  title        = {Multi-frequency (S, X, Q and W-band) EPR and ENDOR study of vanadium (IV) incorporation in the aluminium metal-organic framework MIL-53},
  url          = {http://dx.doi.org/10.1002/cphc.201500522},
  volume       = {16},
  year         = {2015},
}

Altmetric
View in Altmetric
Web of Science
Times cited: