Polarized Neutron Diffraction as a Tool for Mapping Molecular Magnetic Anisotropy: Local Susceptibility Tensors in CoII Complexes |
| |
| Authors: | Dr Karl Ridier Dr Béatrice Gillon Dr Arsen Gukasov Dr Grégory Chaboussant Dr Alain Cousson Prof Dominique Luneau Dr Ana Borta Dr Jean‐François Jacquot Dr Ruben Checa Yukako Chiba Prof Hiroshi Sakiyama Prof Masahiro Mikuriya |
| |
| Institution: | 1. Laboratoire Léon Brillouin (UMR12), CEA‐CNRS, CEA Saclay, 91191 Gif‐sur‐Yvette (France);2. Present address: GEMaC, UMR8635, Université Versailles St‐Quentin‐en‐Yvelines, 45, avenue des Etats‐Unis, 78035 Versailles Cedex (France);3. Laboratoire des Multimatériaux et Interfaces (UMR5615), Université Claude Bernard Lyon 1, 69622 Villeurbanne (France);4. Present address: Service Photons Atoms & Molecules, IRAMIS, CEA Saclay, 91191 Gif Sur Yvette (France);5. SCIB, UMR‐E 3 CEA/UJF‐Grenoble 1, INAC, CEA‐UJF, 38054 Grenoble (France);6. Faculty of Science, Yamagata University, Yamagata 990‐8560 (Japan);7. School of Science and Technology, Kwansei Gakuin University, Sanda 669‐1337 (Japan) |
| |
| 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 CoII(dmf)6](BPh4)2 ( 1 ) and CoII2(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 CoII site. In compound 1 , this approach reveals the correlation between the single‐ion easy magnetization direction and a trigonal elongation axis of the CoII coordination octahedron. In exchange‐coupled dimer 2 , the determination of the individual CoII magnetic susceptibility tensors provides a clear outlook of how the local magnetic properties on both CoII sites deviate from the single‐ion behavior because of antiferromagnetic exchange coupling. |
| |
| Keywords: | magnetic anisotropy magnetic properties magnetic susceptibility tensor molecular magnetism neutron diffraction |
|
|
