TY - JOUR
T1 - High-field ESR on light-induced transition of spin multiplicity in FeCo complex
AU - Yoshii, S.
AU - Nojiri, H.
AU - Sato, O.
N1 - Funding Information:
Acknowledgements This work was partly supported by the Center for Integrated Nanotechnology Support at Tohoku University and also by “Nanotechnology Network Project” of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of the Japanese Government.
PY - 2013/3
Y1 - 2013/3
N2 - Cyanide-bridged Fe-Co complex [Fe(Tp)(CN)3]2Co(bpe) ×5H2O (1×5H2O; Tp = hydro-tris(pyrazolyl) borate; bpe = 1,2-bis(4-pyridyl)ethane) shows temperature- and light- induced metal-to-metal charge transfer (MMCT) involving spin state changes between magnetic FeIIILS-CoII HS(HS = high spin, LS = low spin) state and nonmagnetic Fe IILS-CoIIIHS state, while the dehydrated material 1 does not show any MMCT and holds Fe IIILS-CoIIHS state. We have investigated the magnetic properties of each spin state in 1 and 1×5H2O by means of magnetization and ESR measurement under pulsed high magnetic field. At low temperature below T N, in both 1 and 1×5H2O, the saturation magnetization in the induced ferromagnetic phase is well explained by S and g values derived from the magnetic susceptibility study. In the ESR of 1, we observed characteristic modes corresponding to a spin excitation in the induced ferromagnetic phase where its temperature dependence shows an evolution of spin correlation in the Fe IIILS-CoIIHS state at low temperature. We further found that the similar ESR modes grow in the light-induced state of 1×5H2O. The results strongly suggest that the light-induced magnetization in 1×5H2O is driven by a light-induced MMCT, which involves transition of spin multiplicity from the nonmagnetic FeIILS-CoIII HS to the magnetic FeIIILS-Co IIHS pair.
AB - Cyanide-bridged Fe-Co complex [Fe(Tp)(CN)3]2Co(bpe) ×5H2O (1×5H2O; Tp = hydro-tris(pyrazolyl) borate; bpe = 1,2-bis(4-pyridyl)ethane) shows temperature- and light- induced metal-to-metal charge transfer (MMCT) involving spin state changes between magnetic FeIIILS-CoII HS(HS = high spin, LS = low spin) state and nonmagnetic Fe IILS-CoIIIHS state, while the dehydrated material 1 does not show any MMCT and holds Fe IIILS-CoIIHS state. We have investigated the magnetic properties of each spin state in 1 and 1×5H2O by means of magnetization and ESR measurement under pulsed high magnetic field. At low temperature below T N, in both 1 and 1×5H2O, the saturation magnetization in the induced ferromagnetic phase is well explained by S and g values derived from the magnetic susceptibility study. In the ESR of 1, we observed characteristic modes corresponding to a spin excitation in the induced ferromagnetic phase where its temperature dependence shows an evolution of spin correlation in the Fe IIILS-CoIIHS state at low temperature. We further found that the similar ESR modes grow in the light-induced state of 1×5H2O. The results strongly suggest that the light-induced magnetization in 1×5H2O is driven by a light-induced MMCT, which involves transition of spin multiplicity from the nonmagnetic FeIILS-CoIII HS to the magnetic FeIIILS-Co IIHS pair.
KW - High-field ESR
KW - Molecular magnet
KW - Spin state transition
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U2 - 10.1007/s10909-012-0793-2
DO - 10.1007/s10909-012-0793-2
M3 - Article
AN - SCOPUS:84876295994
SN - 0022-2291
VL - 170
SP - 383
EP - 388
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
IS - 5-6
ER -