title: Polarized Neutron Diffraction as a Tool for Mapping Molecular Magnetic Anisotropy: Local Susceptibility Tensors in Co(II) Complexes.
abstract: Polarized neutron diffraction (PND) experiments were carried out at low temperature to characterize with high precision the local magnetic anisotropy in two paramagnetic high-spin cobalt(II) complexes, namely [Co(II) (dmf)6 ](BPh4 )2 (1) and [Co(II) 2 (sym-hmp)2 ](BPh4 )2 (2), in which dmf=N,N-dimethylformamide; sym-hmp=2,6-bis[(2-hydroxyethyl)methylaminomethyl]-4-methylphenolate, and BPh4 (-) =tetraphenylborate. This allowed a unique and direct determination of the local magnetic susceptibility tensor on each individual Co(II) site. In compound 1, this approach reveals the correlation between the single-ion easy magnetization direction and a trigonal elongation axis of the Co(II) coordination octahedron. In exchange-coupled dimer 2, the determination of the individual Co(II) magnetic susceptibility tensors provides a clear outlook of how the local magnetic properties on both Co(II) sites deviate from the single-ion behavior because of antiferromagnetic exchange coupling.
authors.affiliation: Laboratoire Léon Brillouin (UMR12), CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France).|Present address: GEMaC, UMR8635, Université Versailles St-Quentin-en-Yvelines, 45, avenue des Etats-Unis, 78035 Versailles Cedex (France).
authors.forename: Karl
authors.initials: K
authors.lastname: Ridier
authors.affiliation: Laboratoire Léon Brillouin (UMR12), CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France). beatrice.gillon@cea.fr.
authors.forename: Béatrice
authors.initials: B
authors.lastname: Gillon
authors.affiliation: Laboratoire Léon Brillouin (UMR12), CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France).
authors.forename: Arsen
authors.initials: A
authors.lastname: Gukasov
authors.affiliation: Laboratoire Léon Brillouin (UMR12), CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France).
authors.forename: Grégory
authors.initials: G
authors.lastname: Chaboussant
authors.affiliation: Laboratoire Léon Brillouin (UMR12), CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette (France).
authors.forename: Alain
authors.initials: A
authors.lastname: Cousson
authors.affiliation: Laboratoire des Multimatériaux et Interfaces (UMR5615), Université Claude Bernard Lyon 1, 69622 Villeurbanne (France). dominique.luneau@univ-lyon1.fr.
authors.forename: Dominique
authors.initials: D
authors.lastname: Luneau
authors.affiliation: Laboratoire des Multimatériaux et Interfaces (UMR5615), Université Claude Bernard Lyon 1, 69622 Villeurbanne (France).|Present address: Service Photons Atoms & Molecules, IRAMIS, CEA Saclay, 91191 Gif Sur Yvette (France).
authors.forename: Ana
authors.initials: A
authors.lastname: Borta
authors.affiliation: SCIB, UMR-E 3 CEA/UJF-Grenoble 1, INAC, CEA-UJF, 38054 Grenoble (France).
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Jacquot
authors.affiliation: Laboratoire des Multimatériaux et Interfaces (UMR5615), Université Claude Bernard Lyon 1, 69622 Villeurbanne (France).
authors.forename: Ruben
authors.initials: R
authors.lastname: Checa
authors.affiliation: Faculty of Science, Yamagata University, Yamagata 990-8560 (Japan).
authors.forename: Yukako
authors.initials: Y
authors.lastname: Chiba
authors.affiliation: Faculty of Science, Yamagata University, Yamagata 990-8560 (Japan).
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sakiyama
authors.affiliation: School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337 (Japan).
authors.forename: Masahiro
authors.initials: M
authors.lastname: Mikuriya
keywords: magnetic anisotropy; magnetic properties; magnetic susceptibility tensor; molecular magnetism; neutron diffraction