Journal article

Ferromagnetic and antiferromagnetic intermolecular interactions in a new family of Mn-4 complexes with an energy barrier to magnetization reversal

C Boskovic, R Bircher, PLW Tregenna-Piggott, HU Gudel, C Paulsen, W Wernsdorfer, AL Barra, E Khatsko, A Neels, H Stoeckli-Evans

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | AMER CHEMICAL SOC | Published : 2003

Abstract

A new family of tetranuclear Mn complexes [Mn4X4L4] (H2L = salicylidene-2-ethanolamine; X = Cl (1) or Br (2)) and [Mn4Cl4(L')4] (H2L' = 4-tert-butyl-salicylidene-2-ethanolamine, (3)) has been synthesized and studied. Complexes 1-3 possess a square-shaped core with ferromagnetic exchange interactions between the four Mn(III) centers resulting in an S = 8 spin ground state. Magnetochemical studies and high-frequency EPR spectroscopy reveal an axial magnetoanisotropy with D values in the range -0.10 to -0.20 cm(-1) for complexes 2 and 3 and for differently solvated forms of 1. As a result, these species possess an anisotropy-induced energy barrier to magnetization reversal and display slow rela..

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