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[UF 6 ] 2− : A Molecular Hexafluorido Actinide(IV) Complex with Compensating Spin and Orbital Magnetic Moments
Author(s) -
Pedersen Kasper S.,
Meihaus Katie R.,
Rogalev Andrei,
Wilhelm Fabrice,
Aravena Daniel,
Amoza Martín,
Ruiz Eliseo,
Long Jeffrey R.,
Bendix Jesper,
Clérac Rodolphe
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201905056
Subject(s) - magnetic circular dichroism , actinide , magnetic moment , chemistry , spin (aerodynamics) , x ray magnetic circular dichroism , magnetization , molecular orbital , ab initio , ion , ab initio quantum chemistry methods , atomic physics , condensed matter physics , physics , molecule , magnetic field , inorganic chemistry , spectral line , organic chemistry , quantum mechanics , astronomy , thermodynamics
The first structurally characterized hexafluorido complex of a tetravalent actinide ion, the [UF 6 ] 2− anion, is reported in the (NEt 4 ) 2 [UF 6 ]⋅2 H 2 O salt ( 1 ). The weak magnetic response of 1 results from both U IV spin and orbital contributions, as established by combining X‐ray magnetic circular dichroism (XMCD) spectroscopy and bulk magnetization measurements. The spin and orbital moments are virtually identical in magnitude, but opposite in sign, resulting in an almost perfect cancellation, which is corroborated by ab initio calculations. This work constitutes the first experimental demonstration of a seemingly non‐magnetic molecular actinide complex carrying sizable spin and orbital magnetic moments.
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