Lanthanide-induced relaxation anisotropy

Elizaveta A. Suturina, Kevin Mason, Carlos F.G.C. Geraldes, Nicholas F. Chilton, David Parker, Ilya Kuprov

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Lanthanide ions accelerate nuclear spin relaxation by two primary mechanisms: dipolar and Curie. Both are commonly assumed to depend on the length of the lanthanide-nucleus vector, but not on its direction. Here we show experimentally that this is wrong-careful proton relaxation data analysis in a series of isostructural lanthanide complexes (Ln = Tb, Dy, Ho, Er, Tm, Yb) reveals angular dependence in both Curie and dipolar relaxation. The reasons are: (a) that magnetic susceptibility anisotropy can be of the same order of magnitude as the isotropic part (contradicting the unstated assumption in Guéron's theory of the Curie relaxation process), and (b) that zero-field splitting can be much stronger than the electron Zeeman interaction (Bloembergen's original theory of the lanthanide-induced dipolar relaxation process makes the opposite assumption). These factors go beyond the well researched cross-correlation effects; they alter the relaxation theory treatment and make strong angular dependencies appear in the nuclear spin relaxation rates. Those dependencies are impossible to ignore-this is now demonstrated both theoretically and experimentally, and suggests that a major revision is needed of the way lanthanide-induced relaxation data are used in structural biology.

Original languageEnglish
Pages (from-to)17676-17686
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number26
Early online date8 Jun 2018
DOIs
Publication statusE-pub ahead of print - 8 Jun 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Suturina, E. A., Mason, K., Geraldes, C. F. G. C., Chilton, N. F., Parker, D., & Kuprov, I. (2018). Lanthanide-induced relaxation anisotropy. Physical Chemistry Chemical Physics, 20(26), 17676-17686. https://doi.org/10.1039/c8cp01332b