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A Strictly Dinuclear MnIII–GdIII Complex: Synthesis and Magnetic Properties

A Strictly Dinuclear MnIII–GdIII Complex: Synthesis and Magnetic Properties A strictly heterodinuclear MnIII–Gd complex was prepared from a tripodal ligand and characterized by positive fast‐atom bombardment mass spectrometry, which evidenced replacement of a nitrato counterion by a monoethylcarbonato anion. Variable‐temperature direct current and alternating current studies confirm that the MnIII–Gd magnetic interaction is antiferromagnetic. Fitting of the magnetic susceptibility data yields an extremely weak interaction parameter JMnGd equal to –0.04 cm–1, along with a weak axial zero‐field splitting parameter DMn = 0.1 cm–1. This result confirms that a change in the manganese oxidation state, from MnII to MnIII, corresponds to a radical transformation of the magnetic behavior of Mn–Gd, from a ferromagnetic to an antiferromagnetic interaction. In accordance with the magnetic behavior of CoII–Gd complexes previously studied (high‐spin and low‐spin CoII ions), the observed magnetic behavior change may be explained by the difference in the electronic occupancy of the Mn 3d x 2–y 2 orbital, which is singly occupied for MnII and vacant for MnIII. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png European Journal of Inorganic Chemistry Wiley

A Strictly Dinuclear MnIII–GdIII Complex: Synthesis and Magnetic Properties

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References (52)

Publisher
Wiley
Copyright
"Copyright © 2013 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
1434-1948
eISSN
1099-0682
DOI
10.1002/ejic.201300517
Publisher site
See Article on Publisher Site

Abstract

A strictly heterodinuclear MnIII–Gd complex was prepared from a tripodal ligand and characterized by positive fast‐atom bombardment mass spectrometry, which evidenced replacement of a nitrato counterion by a monoethylcarbonato anion. Variable‐temperature direct current and alternating current studies confirm that the MnIII–Gd magnetic interaction is antiferromagnetic. Fitting of the magnetic susceptibility data yields an extremely weak interaction parameter JMnGd equal to –0.04 cm–1, along with a weak axial zero‐field splitting parameter DMn = 0.1 cm–1. This result confirms that a change in the manganese oxidation state, from MnII to MnIII, corresponds to a radical transformation of the magnetic behavior of Mn–Gd, from a ferromagnetic to an antiferromagnetic interaction. In accordance with the magnetic behavior of CoII–Gd complexes previously studied (high‐spin and low‐spin CoII ions), the observed magnetic behavior change may be explained by the difference in the electronic occupancy of the Mn 3d x 2–y 2 orbital, which is singly occupied for MnII and vacant for MnIII.

Journal

European Journal of Inorganic ChemistryWiley

Published: Jan 1, 2013

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