Three‐Axis Anisotropic Exchange Coupling in the Single‐Molecule Magnets NEt4[MnIII2(5‐Brsalen)2(MeOH)2MIII(CN)6] (M=Ru,Os) |
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| Authors: | Dr Jan Dreiser Kasper S Pedersen Dr Alexander Schnegg Dr Karsten Holldack Joscha Nehrkorn Marc Sigrist Dr Hannu Mutka Dr Høgni Weihe Dr Vladimir S Mironov Prof Jesper Bendix Prof Oliver Waldmann |
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| Institution: | 1. Physikalisches Institut, Universit?t Freiburg, 79104 Freiburg (Germany);2. Present address: Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI (Switzerland);3. Department of Chemistry, University of Copenhagen, 2100 Copenhagen (Denmark);4. Helmholtz‐Zentrum für Materialien und Energie, Institut für Silizium‐Photovoltaik, 12489 Berlin (Germany);5. Helmholtz‐Zentrum für Materialien und Energie, Inst. f. Methoden und Instrumente der Forschung mit Synchrotronstrahlung, 12489 Berlin (Germany);6. Institut Laue‐Langevin, 38042 Grenoble Cedex 9 (France);7. A.?V. Schubnikov Institute of Crystallography, 119333 Moscow (Russia) |
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| Abstract: | We have investigated the single‐molecule magnets MnIII2(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. |
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| Keywords: | magnetic properties manganese osmium ruthenium single‐molecule studies |
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