Single-molecule magnet behavior in a tetranuclear cyano-bridged FeIII2NiII2 cluster.

A tetranuclear cyanide-bridged Fe III 2 Ni II 2 cluster [Fe III (Tp)(CN) 3 ] 2 Ni II 2 (4, 4′-dibromo-2, 2′-bpy) 4 ·2ClO 4 ( 1 ) (Tp = hydrotris(pyrazolyl)borate) was synthesized. Magnetic measurements indicated that this compound displayed single-molecule magnet behavior with the pre-exponential factor of τ 0 = 1.79(8) × 10 − 10 s and the relaxation energy barrier of Δ/ k B = 65.1(9) K. [ABSTRACT FROM AUTHOR]