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An Ni 4 Single‐Molecule Magnet: Synthesis, Structure and Low‐Temperature Magnetic Behavior
Author(s) -
MoraguesCánovas María,
Helliwell Madeleine,
Ricard Louis,
Rivière Éric,
Wernsdorfer Wolfgang,
Brechin Euan,
Mallah Talal
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400129
Subject(s) - chemistry , cubane , magnetization , intramolecular force , single molecule magnet , ground state , ferromagnetism , excited state , magnetic anisotropy , relaxation (psychology) , quantum tunnelling , molecule , anisotropy , condensed matter physics , single crystal , magnet , crystallography , crystal structure , magnetic field , atomic physics , stereochemistry , physics , psychology , social psychology , organic chemistry , quantum mechanics
The reaction of Ni(NO 3 ) 2 ·6H 2 O with H 3 thme (trihydroxymethylethane) in the presence of NaOMe leads to a tetranuclear Ni 4 complex with a cubane‐like structure. Intramolecular ferromagnetic interactions [ J = 10 cm −1 based on H = − J ( S 1 · S 2 + S 1 · S 3 + S 1 · S 4 + S 2 · S 3 + S 2 · S 4 + S 3 · S 4 )] lead to an S = 4 ground state stabilized by 40 cm −1 from the first S = 3 excited state. Magnetization vs. field studies at different temperatures above 2 K suggest the presence of an axial magnetic anisotropy. Single‐crystal magnetization measurements show a single‐molecule‐magnetic behavior below T = 0.5 K with fast relaxation of the magnetization due to resonant quantum tunneling. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)