An Ni4 Single-Molecule Magnet: Synthesis, Structure and Low-Temperature Magnetic Behavior

✍ Scribed by María Moragues-Cánovas; Madeleine Helliwell; Louis Ricard; Éric Rivière; Wolfgang Wernsdorfer; Euan Brechin; Talal Mallah

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 134 KB
• Volume: 2004
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200400129

✦ Synopsis

Abstract

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)