Spectroscopic and Crystal Field Consequences of Fluoride Binding by [Yb.DTMA]3+ in Aqueous Solution

Research output: Contribution to journalArticle

  • External authors:
  • Octavia A Blackburn
  • Katharina Keller
  • Claudia E Tait
  • William K Myers
  • Alan M Kenwright
  • Paul D Beer
  • Christiane R Timmel
  • Stephen Faulkner

Abstract

Yb???DTMA forms a ternary complex with fluoride in aqueous solution by displacement of a bound solvent molecule from the lanthanide ion. [Yb???DTMA???F]2+ and [Yb???DTMA???OH2]3+ are in slow exchange on the relevant NMR timescale ({\textless}2000???s???1), and profound differences are observed in their respective NMR and EPR spectra of these species. The observed differences can be explained by drastic modification of the ligand field states due to the fluoride binding. This changes the magnetic anisotropy of the YbIII ground state from easy-axis to easy-plane type, and this change is easily detected in the observed magnetic anisotropy despite thermal population of more than just the ground state. The spectroscopic consequences of such drastic changes to the ligand field represent important new opportunities in developing fluoride-responsive complexes and contrast agents.

Bibliographical metadata

Original languageEnglish
Pages (from-to)10783-10786
Number of pages4
JournalAngewandte Chemie International Edition
Volume54
Issue number37
DOIs
StatePublished - Sep 2015