Anisotropic exchange interactions in [Ln3 + s(-) FeLS 3 +] dinuclear systems (Ln3+ = Dy, Tm, Yb): Magnetometry and Dual Mode X-band Electron Paramagnetic Resonance spectroscopic study

Vassilis Tangoulis*, Albert Figuerola

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A recently developed experimental and theoretical procedure is used in order to calculate the magnitude and anisotropy of interaction between a lanthanide and a 3d-metal ion. The general formula of the molecular compounds is [Ln(H2O)3(dmf)4(μ-CN)Fe-(CN)5] · nH2O where 1 ≤ n ≤ 1,5 and dmf = N,N′-dimethylformamide, abbreviated as [LnFe] from now on. The main parts of this procedure are (a) the evaluation of the effective g-parameters of the lanthanide ion with the help of EPR measurements. (b) The use of dual mode EPR spectroscopy to define the anisotropic exchange interactions with the help of an anisotropic Hamiltonian model. (c) Use of the same magnetic model to fit magnetization and susceptibility data in order to verify the EPR findings. It was possible to define some trends concerning the exchange components of the [DyFe] dimer according to which the antiferromagnetic isotropic exchange constant is smaller than 4 cm-1 and the anisotropic components are [Dexc, Eexc] = [≥6(1), 0.0] cm-1. Also for the case of [TmFe] and [YbFe] dimers the antiferromagnetic isotropic exchange constant is smaller than 0.3 cm-1 while the anisotropic components are [Dexc, Eexc] = [≥12.0, 0.0] cm-1 and [Dexc, Eexc] = [0.4(1), 0.0] cm-1, respectively.

Original languageEnglish (US)
Pages (from-to)293-301
Number of pages9
JournalChemical Physics
Volume340
Issue number1-3
DOIs
StatePublished - Nov 9 2007
Externally publishedYes

Keywords

  • Anisotropic exchange interaction
  • Dual mode EPR
  • Lanthanides

ASJC Scopus subject areas

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

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