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Li W, Celinski VR, Weber J, et al. Homogeneity of doping with paramagnetic ions by NMR. Phys Chem Chem Phys. 2016;18(14):9752-7doi: 10.1039/c5cp07606d.
Li, W., Celinski, V. R., Weber, J., Kunkel, N., Kohlmann, H., & Schmedt auf der Günne, J. (2016). Homogeneity of doping with paramagnetic ions by NMR. Physical chemistry chemical physics : PCCP, 18(14), 9752-7. https://doi.org/10.1039/c5cp07606d
Li, Wenyu, et al. "Homogeneity of doping with paramagnetic ions by NMR." Physical chemistry chemical physics : PCCP vol. 18,14 (2016): 9752-7. doi: https://doi.org/10.1039/c5cp07606d
Li W, Celinski VR, Weber J, Kunkel N, Kohlmann H, Schmedt auf der Günne J. Homogeneity of doping with paramagnetic ions by NMR. Phys Chem Chem Phys. 2016 Apr 14;18(14):9752-7. doi: 10.1039/c5cp07606d. Epub 2016 Mar 22. PMID: 27003194.
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Phys Chem Chem Phys. 2016 Apr 14;18(14):9752-7. doi: 10.1039/c5cp07606d. Epub 2016 Mar 22.

Homogeneity of doping with paramagnetic ions by NMR.

Physical chemistry chemical physics : PCCP

Wenyu Li, Vinicius R Celinski, Johannes Weber, Nathalie Kunkel, Holger Kohlmann, Jörn Schmedt auf der Günne

Affiliations

  1. Inorganic Materials Chemistry, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany. [email protected].

PMID: 27003194 DOI: 10.1039/c5cp07606d

Abstract

In NMR, paramagnetic dopants change the relaxation behavior and the chemical shift of the nuclei in their immediate environment. Based on the concept that the "immediate environment" in a diamagnetic host material can be described as a sphere with radius r0, we developed a function for the fraction of unperturbed nuclei (the fraction of nuclei outside the sphere) which gives a link between the effective radius and the doping concentration. In the case of a homogeneous doping scenario a characteristic dependence is observed in both theory and experiment. We validated the model on a sample series where paramagnetic Eu(II) ions are doped into crystalline SrH2. The fraction of unperturbed nuclei was determined from the (1)H NMR signal and follows the predicted curve for a homogeneous doping scenario where the radius r0 is 17 Å.

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