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Issue 8, 2004
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Hetero di- and trinuclear Cu–Gd complexes with trifluoroacetate bridges: synthesis, structural and magnetic studies

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Abstract

The synthesis, structural determinations and magnetic properties of an original dinuclear Cu–Gd and two trinuclear Cu–Ln–Cu complexes (Ln = Gd or Dy) made with a Schiff base ligand and carboxylate ligands are reported. In each complex, the copper and gadolinium or dysprosium ions are linked by a double phenoxo bridge and a η11:μ trifluoroacetato bridge. The dinuclear Cu–Gd complex exhibits the usual ferromagnetic interaction while the trinuclear (Cu–Gd–Cu) complexes can not be fitted with a simple Hamiltonian that only takes into account the Cu–Gd interaction. Introduction into the Hamiltonian of a Cu–Cu interaction between the terminal copper ions gives a nice fit in the case of a ferromagnetic Cu–Cu interaction (JCu–Cu = 8.3 and 9.8 cm−1). For the first time, the occurrence of a ferromagnetic interaction between the copper ions of the trinuclear entities is evidenced and supported by the field dependence of the magnetization. As there is no direct proof for the existence of an interaction between two centers through a third magnetic center located in between them, we can conclude that the existence of π–π stacking interactions through the phenyl rings of the ligands are responsible for the presence of these interactions.

Graphical abstract: Hetero di- and trinuclear Cu–Gd complexes with trifluoroacetate bridges: synthesis, structural and magnetic studies

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Article information


Submitted
01 Oct 2003
Accepted
12 Dec 2003
First published
23 Mar 2004

Dalton Trans., 2004, 1194-1200
Article type
Paper

Hetero di- and trinuclear Cu–Gd complexes with trifluoroacetate bridges: synthesis, structural and magnetic studies

G. Novitchi, S. Shova, A. Caneschi, J. Costes, M. Gdaniec and N. Stanica, Dalton Trans., 2004, 1194
DOI: 10.1039/B312186K

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