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Polarized Neutron Diffraction as a Tool for Mapping Molecular Magnetic Anisotropy: Local Susceptibility Tensors in Co II Complexes
Author(s) -
Ridier Karl,
Gillon Béatrice,
Gukasov Arsen,
Chaboussant Grégory,
Cousson Alain,
Luneau Dominique,
Borta Ana,
Jacquot JeanFrançois,
Checa Ruben,
Chiba Yukako,
Sakiyama Hiroshi,
Mikuriya Masahiro
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201503400
Subject(s) - chemistry , tetraphenylborate , neutron diffraction , magnetic susceptibility , antiferromagnetism , paramagnetism , crystallography , anisotropy , magnetic anisotropy , magnetization , octahedron , cobalt , spin (aerodynamics) , ion , nuclear magnetic resonance , condensed matter physics , inorganic chemistry , physics , crystal structure , magnetic field , organic chemistry , quantum mechanics , thermodynamics
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 ](BPh 4 ) 2 ( 1 ) and [Co II 2 (sym‐hmp) 2 ](BPh 4 ) 2 ( 2 ), in which dmf= N , N ‐dimethylformamide; sym‐hmp=2,6‐bis[(2‐hydroxyethyl)methylaminomethyl]‐4‐methylphenolate, and BPh 4 − =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.