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EPR characterization of vanadium dopant sites in DUT-5(Al)

Kwinten Maes (UGent) , Irena Nevjestic (UGent) , Hannes Depauw, Karen Leus (UGent) , Pascal Van Der Voort (UGent) , Henk Vrielinck (UGent) and Freddy Callens (UGent)
(2019) OPTICAL MATERIALS. 94. p.217-223
Author
Organization
Abstract
The structural environment of the V-IV ions doped in the metal-organic framework (MOF) DUT-5(Al) (((AlOH)-O-III) BPDC) was studied with electron paramagnetic resonance (EPR). At low V concentrations, two different vanadyl components are observed in the EPR spectrum: a broad-line component, best visible at ambient air conditions, and a narrow-line component, becoming more prominent at lower pressures. Recording the EPR spectra at both X- and Q-band, spin-Hamiltonian parameters were derived for both components. Similarities between the spectrum of the narrow-line component and the spectrum of V-IV centers in the large pore state of a related MOF, MIL-53(Al) (((AlOH)-O-III)BDC), are discussed, including their sensitivity to oxygen. The broad-line component cannot conclusively be identified by comparison with V-IV centers in MIL-53(Al). Increasing the concentration of V-IV in the DUT-5(Al) framework, a third vanadyl component appears in the spectrum, together with a broad feature related to the spectrum of COMOC-2(V) ((V-IV =O)BPDC). Surprisingly, this third component appears to be linked with a narrow pore state of the mixed-metal MOF.
Keywords
Metal-organic frameworks (MOFs), Breathing, Oxygen sensitivity, Flexibility, Electron paramagnetic resonance (EPR), METAL-ORGANIC-FRAMEWORK, MIL-53, ADSORPTION

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Citation

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

MLA
Maes, Kwinten, et al. “EPR Characterization of Vanadium Dopant Sites in DUT-5(Al).” OPTICAL MATERIALS, vol. 94, 2019, pp. 217–23.
APA
Maes, K., Nevjestic, I., Depauw, H., Leus, K., Van Der Voort, P., Vrielinck, H., & Callens, F. (2019). EPR characterization of vanadium dopant sites in DUT-5(Al). OPTICAL MATERIALS, 94, 217–223.
Chicago author-date
Maes, Kwinten, Irena Nevjestic, Hannes Depauw, Karen Leus, Pascal Van Der Voort, Henk Vrielinck, and Freddy Callens. 2019. “EPR Characterization of Vanadium Dopant Sites in DUT-5(Al).” OPTICAL MATERIALS 94: 217–23.
Chicago author-date (all authors)
Maes, Kwinten, Irena Nevjestic, Hannes Depauw, Karen Leus, Pascal Van Der Voort, Henk Vrielinck, and Freddy Callens. 2019. “EPR Characterization of Vanadium Dopant Sites in DUT-5(Al).” OPTICAL MATERIALS 94: 217–223.
Vancouver
1.
Maes K, Nevjestic I, Depauw H, Leus K, Van Der Voort P, Vrielinck H, et al. EPR characterization of vanadium dopant sites in DUT-5(Al). OPTICAL MATERIALS. 2019;94:217–23.
IEEE
[1]
K. Maes et al., “EPR characterization of vanadium dopant sites in DUT-5(Al),” OPTICAL MATERIALS, vol. 94, pp. 217–223, 2019.
@article{8617492,
  abstract     = {The structural environment of the V-IV ions doped in the metal-organic framework (MOF) DUT-5(Al) (((AlOH)-O-III) BPDC) was studied with electron paramagnetic resonance (EPR). At low V concentrations, two different vanadyl components are observed in the EPR spectrum: a broad-line component, best visible at ambient air conditions, and a narrow-line component, becoming more prominent at lower pressures. Recording the EPR spectra at both X- and Q-band, spin-Hamiltonian parameters were derived for both components. Similarities between the spectrum of the narrow-line component and the spectrum of V-IV centers in the large pore state of a related MOF, MIL-53(Al) (((AlOH)-O-III)BDC), are discussed, including their sensitivity to oxygen. The broad-line component cannot conclusively be identified by comparison with V-IV centers in MIL-53(Al). Increasing the concentration of V-IV in the DUT-5(Al) framework, a third vanadyl component appears in the spectrum, together with a broad feature related to the spectrum of COMOC-2(V) ((V-IV =O)BPDC). Surprisingly, this third component appears to be linked with a narrow pore state of the mixed-metal MOF.},
  author       = {Maes, Kwinten and Nevjestic, Irena and Depauw, Hannes and Leus, Karen and Van Der Voort, Pascal and Vrielinck, Henk and Callens, Freddy},
  issn         = {0925-3467},
  journal      = {OPTICAL MATERIALS},
  keywords     = {Metal-organic frameworks (MOFs),Breathing,Oxygen sensitivity,Flexibility,Electron paramagnetic resonance (EPR),METAL-ORGANIC-FRAMEWORK,MIL-53,ADSORPTION},
  language     = {eng},
  pages        = {217--223},
  title        = {EPR characterization of vanadium dopant sites in DUT-5(Al)},
  url          = {http://dx.doi.org/10.1016/j.optmat.2019.05.050},
  volume       = {94},
  year         = {2019},
}

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