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Issue 6, 2016
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Another challenge to paramagnetic relaxation theory: a study of paramagnetic proton NMR relaxation in closely related series of pyridine-derivatised dysprosium complexes

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Abstract

Measurements of the relaxation rate behaviour of two series of dysprosium complexes have been performed in solution, over the field range 1.0 to 16.5 Tesla. The field dependence has been modelled using Bloch–Redfield–Wangsness theory, allowing estimates of the electronic relaxation time, T1e, and the size of the magnetic susceptibility, μeff, to be made. Changes in relaxation rate of the order of 50% at higher fields were measured, following variation of the para-substituent in the single pyridine donor. The magnetic susceptibilities deviated unexpectedly from the free-ion values for certain derivatives in each series examined, in a manner that was independent of the electron-releasing/withdrawing ability of the pyridine substituent, suggesting that the polarisability of just one pyridine donor in octadenate ligands can play a significant role in defining the magnetic susceptibility anisotropy.

Graphical abstract: Another challenge to paramagnetic relaxation theory: a study of paramagnetic proton NMR relaxation in closely related series of pyridine-derivatised dysprosium complexes

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Publication details

The article was received on 05 Nov 2015, accepted on 15 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5CP06755C
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Citation: Phys. Chem. Chem. Phys., 2016,18, 4370-4375

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    Another challenge to paramagnetic relaxation theory: a study of paramagnetic proton NMR relaxation in closely related series of pyridine-derivatised dysprosium complexes

    N. J. Rogers, K. N. A. Finney, P. K. Senanayake and D. Parker, Phys. Chem. Chem. Phys., 2016, 18, 4370
    DOI: 10.1039/C5CP06755C

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