MnIII zero-field splitting parameters and weak exchange interactions in a cyanide-bridged {MnIII–IrIII–MnIII} cluster
2012; Elsevier BV; Volume: 24; Linguagem: Inglês
10.1016/j.inoche.2012.07.045
ISSN1879-0259
AutoresKasper S. Pedersen, Marc Sigrist, Høgni Weihe, Philip L. W. Tregenna‐Piggott, Magnus Schau‐Magnussen, Jan Dreiser, H. Mutka, Anne‐Laure Barra, Jesper Bendix,
Tópico(s)Electron Spin Resonance Studies
ResumoThe reaction of [MnIII(5-Brsalen)(MeOH)](ClO4) (5-Brsalen2 − = N,N′-ethylenebis(5-bromosalicylidene-iminate)) with [IrIII(CN)6]3 − yields a trinuclear, cyanide-bridged MnIII–IrIII–MnIII cluster which is a member of an isostructural series of MnIII–MIII–MnIII clusters. The presence of the large, diamagnetic [IrIII(CN)6]3 − bridging unit facilitates a precise determination of the MnIII zero-field splitting (zfs) parameters by the combined use of inelastic neutron scattering, high-field, high-frequency EPR spectroscopy and magnetic measurements. The single-ion axial (D) and rhombic (E) zfs parameters are found to be D = − 3.72(5) cm− 1 and |E| = 0.21(1) cm− 1. The experimental data are consistent with a small, antiferromagnetic exchange interaction between the two MnIII ions.
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