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Three‐Axis Anisotropic Exchange Coupling in the Single‐Molecule Magnets NEt 4 [Mn III 2 (5‐Brsalen) 2 (MeOH) 2 M III (CN) 6 ] (M=Ru, Os)
Author(s) -
Dreiser Jan,
Pedersen Kasper S.,
Schnegg Alexander,
Holldack Karsten,
Nehrkorn Joscha,
Sigrist Marc,
TregennaPiggott Philip,
Mutka Hannu,
Weihe Høgni,
Mironov Vladimir S.,
Bendix Jesper,
Waldmann Oliver
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201203781
Subject(s) - electron paramagnetic resonance , chemistry , anisotropy , squid , analytical chemistry (journal) , atomic physics , nuclear magnetic resonance , condensed matter physics , physics , optics , ecology , biology , chromatography
We have investigated the single‐molecule magnets [Mn III 2 (5‐Brsalen) 2 (MeOH) 2 M III (CN) 6 ]NEt 4 (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 Mn III and Ru III or Os III 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.