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Article Dans Une Revue Dalton Transactions Année : 2012

Multiple-decker phthalocyaninato dinuclear lanthanoid(III) single-molecule magnets with dual-magnetic relaxation processes

Keiichi Katoh
  • Fonction : Auteur
Yoji Horii
  • Fonction : Auteur
Nobuhiro Yasuda
  • Fonction : Auteur
K. Toriumi
  • Fonction : Auteur
Brian K. Breedlove
  • Fonction : Auteur

Résumé

The SMM behaviour of dinuclear Ln(III)-Pc multiple-decker complexes (Ln = Tb3+ and Dy3+) with energy barriers and slow-relaxation behaviour were explained by using X-ray crystallography and static and dynamic susceptibility measurements. In particular, interactions among the 4f electrons of several dinuclear Ln(III)-Pc type SMMs have never been discussed on the basis of the crystal structure. For dinuclear Tb(III)-Pc complexes, a dual magnetic relaxation process was observed. The relaxation processes are due to the anisotropic centres. Our results clearly show that the two Tb3+ ion sites are equivalent and are consistent with the crystal structure. On the other hand, the mononuclear Tb(III)-Pc complex exhibited only a single magnetic relaxation process. This is clear evidence that the magnetic relaxation mechanism depends heavily on the dipole-dipole (f-f) interactions between the Tb3+ ions in the dinuclear systems. Furthermore, the SMM behaviour of dinuclear Dy(III)-Pc type SMMs with smaller energy barriers compared with that of Tb(III)-Pc and slow-relaxation behaviour was explained. Dinuclear Dy(III)-Pc SMMs exhibited single-component magnetic relaxation behaviour. The results indicate that the magnetic relaxation properties of dinuclear Ln(III)-Pc multiple-decker complexes are affected by the local molecular symmetry and are extremely sensitive to tiny distortions in the coordination geometry. In other words, the spatial arrangement of the Ln(3+) ions (f-f interactions) in the crystal is important. Our work shows that the SMM properties can be fine-tuned by introducing weak intermolecular magnetic interactions in a controlled SMM spatial arrangement.
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Dates et versions

hal-00975503 , version 1 (08-04-2014)

Identifiants

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Keiichi Katoh, Yoji Horii, Nobuhiro Yasuda, Wolfgang Wernsdorfer, K. Toriumi, et al.. Multiple-decker phthalocyaninato dinuclear lanthanoid(III) single-molecule magnets with dual-magnetic relaxation processes. Dalton Transactions, 2012, 41 (44), pp.13582-13600. ⟨10.1039/C2DT31400B⟩. ⟨hal-00975503⟩

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