"Naked" [Mn3O]7+ triangles: The effect of auxiliary ligands on magnetic exchange

Efi Manolopoulou, Constantinos C. Stoumpos, Milosz Siczek, Tadeusz Lis, Euan K. Brechin, Constantinos J. Milios

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The reaction between Mn(ClO4)2-6H2O, Et-saoH2 (Et-saoH2 = 2-hydroxypropiophenone oxime), NEt4OH and [Ni(pao)2(py)2] (paoH = 2-pyridylaldoxime) in MeOH forms the complex [MnIII 3O(Et-sao)3(HCO2)(MeOH)5] (1) in good yields. The reaction of MnCl2-4H2O, Me-saoH 2 (Me-saoH2 = 2-hydroxyphenylethanone oxime), NEt 14OH and DL-valine in MeOH gives the complex [MnIII 3SO(Me-SaO)3(MeOH)5]Cl (2) in moderate yields. In both complexes the building block consists of a triangular {Mn III30(R-sao)3} unit (R = Et, Me for 1 and 2, respectively). In the case of 2, the [Mn3] unit can be considered "naked" as there is no capping ligand present, whereas in the case of 1 a formate ion is terminally bonded to one metal centre. DC magnetic susceptibility measurements for 1 and 2 reveal the presence of both ferromagnetic and antiferromagnetic intramolecular interactions, depending on the Mn-N-O-Mn torsion angles within each cluster, leading to a ground state S = 2 for both, complexes. Rationalization of this result is attempted by structural comparison of previously reported triangular [Mn3] oximate complexes on the basis of "flat" and "twisted" torsion angles and the effect of the auxiliary ligands.

Original languageEnglish (US)
Pages (from-to)483-489
Number of pages7
JournalEuropean Journal of Inorganic Chemistry
Issue number3
DOIs
StatePublished - Jan 25 2010

Keywords

  • Ligand effects
  • Magnetic properties
  • Manganese
  • Oximes

ASJC Scopus subject areas

  • Inorganic Chemistry

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