Skip to main content

Research Repository

Advanced Search

Challenging lanthanide relaxation theory: erbium and thulium complexes that show NMR relaxation rates faster than dysprosium and terbium analogues

Funk, A.M.; Harvey, P.; Finney, K.-L.N.A.; Fox, M.A.; Kenwright, A.M.; Rogers, N.J.; Senanayake, P.K.; Parker, D.

Challenging lanthanide relaxation theory: erbium and thulium complexes that show NMR relaxation rates faster than dysprosium and terbium analogues Thumbnail


Authors

A.M. Funk

P. Harvey

K.-L.N.A. Finney

A.M. Kenwright

N.J. Rogers

P.K. Senanayake



Abstract

Measurements of the proton NMR paramagnetic relaxation rates for several series of isostructural lanthanide(III) complexes have been performed in aqueous solution over the field range 1.0 to 16.5 Tesla. The field dependence has been modeled using Bloch–Redfield–Wangsness theory, allowing values for the electronic relaxation time, Tle and the magnetic susceptibility, μeff, to be estimated. Anomalous relaxation rate profiles were obtained, notably for erbium and thulium complexes of low symmetry 8-coordinate aza-phosphinate complexes. Such behaviour challenges accepted theory and can be interpreted in terms of changes in Tle values that are a function of the transient ligand field induced by solvent collision and vary considerably between Ln3+ ions, along with magnetic susceptibilities that deviate significantly from free-ion values.

Citation

Funk, A., Harvey, P., Finney, K., Fox, M., Kenwright, A., Rogers, N., …Parker, D. (2015). Challenging lanthanide relaxation theory: erbium and thulium complexes that show NMR relaxation rates faster than dysprosium and terbium analogues. Physical Chemistry Chemical Physics, 17(25), 16507-16511. https://doi.org/10.1039/c5cp02210j

Journal Article Type Article
Acceptance Date Jun 2, 2015
Online Publication Date Jun 2, 2015
Publication Date Jul 7, 2015
Deposit Date Jun 28, 2015
Publicly Available Date Mar 29, 2024
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 17
Issue 25
Pages 16507-16511
DOI https://doi.org/10.1039/c5cp02210j

Files




You might also like



Downloadable Citations