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Issue 44, 2012
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Modeling the properties of lanthanoid single-ion magnets using an effective point-charge approach

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Abstract

Herein, we present two geometrical models based on an effective point-charge approach to provide a full description of the lowest sublevels in lanthanoid single ion magnets (SIMs). The first one, named as the Radial Effective Charge (REC) model, evaluates the crystal field effect of spherical ligands, e.g. F, Cl or Br, by placing the effective charge along the Ln–ligand axes. In this case the REC parameters are obtained fitting high-resolution spectroscopic data for lanthanoid halides. The second model, named as the Lone Pair Effective Charge (LPEC) model, has been developed in order to provide a realistic description of systems in which the lone pairs are not pointing directly towards the magnetic ion. A relevant example of this kind is provided by the bis(phthalocyaninato)lanthanoids [Ln(Pc)2]. We show that a fit of the magnetic properties of the [Ln(Pc)2] (Ln = Tb, Dy, Ho, Er, Tm and Yb) allows us to extract the LPEC parameters for the lanthanoid complexes coordinated to sp2-nitrogens. Finally, we show that these effective corrections may be extrapolated to a large variety of lanthanoid and actinoid compounds, having either extended or molecular structures.

Graphical abstract: Modeling the properties of lanthanoid single-ion magnets using an effective point-charge approach

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Supplementary files

Article information


Submitted
29 Jun 2012
Accepted
24 Aug 2012
First published
24 Aug 2012

Dalton Trans., 2012,41, 13705-13710
Article type
Paper

Modeling the properties of lanthanoid single-ion magnets using an effective point-charge approach

J. J. Baldoví, J. J. Borrás-Almenar, J. M. Clemente-Juan, E. Coronado and A. Gaita-Ariño, Dalton Trans., 2012, 41, 13705
DOI: 10.1039/C2DT31411H

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