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Issue 27, 2006
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Ligand-induced distortion of a tetranuclear manganese butterfly complex

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Abstract

The reaction of the pentadentate Schiff-base ligand 1,3-bis(salicylideneamino)-2-propanol (salproH3) with [Mn3O(O2CR)6(py)3] (R = Me, Et, But) gives the corresponding tetranuclear manganese product [Mn4O2(O2CR)5(salpro)] (4MnIII). The syntheses, structure and magnetochemical characterization of these complexes are reported. The structure of the [Mn43-O)2]8+ is butterfly-like much more closed than in previous complexes with this core as a result of the alkoxide oxygen of the salpro ligand bridging the two wingtip Mn atoms. Variable-temperature, solid-state magnetic susceptibility studies reveal that these complexes possess S = 0 ground state spins. Fitting of the magnetic susceptibility data to the theoretical χMTvs. T expression derived for a C2v symmetry complex, assuming an isotropic Heisenberg spin-Hamiltonian and using the Van Vleck equation, revealed that the various exchange parameters are all antiferromagnetic, and the core thus experiences spin frustration effects.

Graphical abstract: Ligand-induced distortion of a tetranuclear manganese butterfly complex

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Publication details

The article was received on 14 Feb 2006, accepted on 17 Mar 2006 and first published on 12 Apr 2006


Article type: Paper
DOI: 10.1039/B602192A
Dalton Trans., 2006, 3306-3312

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    Ligand-induced distortion of a tetranuclear manganese butterfly complex

    R. Bagai, K. A. Abboud and G. Christou, Dalton Trans., 2006, 3306
    DOI: 10.1039/B602192A

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