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Issue 14, 2016
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Homogeneity of doping with paramagnetic ions by NMR

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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 1H NMR signal and follows the predicted curve for a homogeneous doping scenario where the radius r0 is 17 Å.

Graphical abstract: Homogeneity of doping with paramagnetic ions by NMR

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Supplementary files

Article information


Submitted
09 Dec 2015
Accepted
01 Mar 2016
First published
02 Mar 2016

This article is Open Access

Phys. Chem. Chem. Phys., 2016,18, 9752-9757
Article type
Paper

Homogeneity of doping with paramagnetic ions by NMR

W. Li, V. R. Celinski, J. Weber, N. Kunkel, H. Kohlmann and J. Schmedt auf der Günne, Phys. Chem. Chem. Phys., 2016, 18, 9752
DOI: 10.1039/C5CP07606D

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