Three-axis anisotropic exchange coupling in the single-molecule magnets NEt4[MnIII 2(5-Brsalen)2(MeOH) 2MIII(CN)6] (M=Ru, Os)

Jan Dreiser, Kasper S. Pedersen, Alexander Schnegg, Karsten Holldack, Joscha Nehrkorn, Marc Sigrist, Philip Tregenna-Piggott, Hannu Mutka, Høgni Weihe, Vladimir S. Mironov, Jesper Bendix, Oliver Waldmann

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Abstract

We have investigated the single-molecule magnets [MnIII 2(5-Brsalen)2(MeOH)2MIII(CN) 6]NEt4 (M=Os (1) and Ru (2); 5-Brsalen=N,N-ethylenebis(5- bromosalicylidene)iminate) by frequency-domain Fourier-transform terahertz electron paramagnetic resonance (THz-EPR), inelastic neutron scattering, and superconducting quantum interference device (SQUID) magnetometry. The combination of all three techniques allows for the unambiguous experimental determination of the three-axis anisotropic magnetic exchange coupling between MnIII and RuIII or OsIII ions, respectively. Analysis by means of a spin-Hamiltonian parameterization yields excellent agreement with all experimental data. Furthermore, analytical calculations show that the observed exchange anisotropy is due to the bent geometry encountered in both 1 and 2, whereas a linear geometry would lead to an Ising-type exchange coupling.

Original languageEnglish
Pages (from-to)3693-3701
Number of pages9
JournalChemistry - A European Journal
Volume19
Issue number11
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • magnetic properties
  • manganese
  • osmium
  • ruthenium
  • single-molecule studies

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