TY - JOUR
T1 - Three-axis anisotropic exchange coupling in the single-molecule magnets NEt4[MnIII
2(5-Brsalen)2(MeOH) 2MIII(CN)6] (M=Ru, Os)
AU - Dreiser, Jan
AU - Pedersen, Kasper S.
AU - Schnegg, Alexander
AU - Holldack, Karsten
AU - Nehrkorn, Joscha
AU - Sigrist, Marc
AU - Tregenna-Piggott, Philip
AU - Mutka, Hannu
AU - Weihe, Høgni
AU - Mironov, Vladimir S.
AU - Bendix, Jesper
AU - Waldmann, Oliver
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - magnetic properties
KW - manganese
KW - osmium
KW - ruthenium
KW - single-molecule studies
UR - http://www.scopus.com/inward/record.url?scp=84874600786&partnerID=8YFLogxK
U2 - 10.1002/chem.201203781
DO - 10.1002/chem.201203781
M3 - Article
AN - SCOPUS:84874600786
SN - 0947-6539
VL - 19
SP - 3693
EP - 3701
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 11
ER -