TY - JOUR
T1 - Chemical trend on the lanthanide-radical exchange coupling
AU - Ishida, Takayuki
AU - Nakamura, Takeshi
AU - Kihara, Takumi
AU - Nojiri, Hiroyuki
N1 - Funding Information:
This work was partly supported by KAKENHI (Grant Number JSPS/15H03793 ) and the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University , Japan.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/11/4
Y1 - 2017/11/4
N2 - From the high-frequency electron paramagnetic resonance spectra on [Ln(hfac)3(TMIO)2] (Ln = Tb, Dy; TMIO = 1,1,3,3-tetramethylisoindolin-2-oxyl; hfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dionate) the level-crossing fields of the radical signal of the Tb and Dy complexes were determined to be 21.9(3) and 20(2) T, respectively. The observation of a single signal is consistent with the two-fold molecular symmetry. The coupling constants were evaluated, giving JTb-rad/kB = −4.47(4) K and JDy-rad/kB = −3.2(4) K. Since the exchange coupling constant in [Gd(hfac)3(TMIO)2] has already been determined to be JGd-rad/kB = −12.5(4) K from the magnetic susceptibility measurements, the lanthanide-dependence on |JLn-rad| was concluded as |JGd-rad| > |JTb-rad| > |JDy-rad| in this series.
AB - From the high-frequency electron paramagnetic resonance spectra on [Ln(hfac)3(TMIO)2] (Ln = Tb, Dy; TMIO = 1,1,3,3-tetramethylisoindolin-2-oxyl; hfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dionate) the level-crossing fields of the radical signal of the Tb and Dy complexes were determined to be 21.9(3) and 20(2) T, respectively. The observation of a single signal is consistent with the two-fold molecular symmetry. The coupling constants were evaluated, giving JTb-rad/kB = −4.47(4) K and JDy-rad/kB = −3.2(4) K. Since the exchange coupling constant in [Gd(hfac)3(TMIO)2] has already been determined to be JGd-rad/kB = −12.5(4) K from the magnetic susceptibility measurements, the lanthanide-dependence on |JLn-rad| was concluded as |JGd-rad| > |JTb-rad| > |JDy-rad| in this series.
KW - Electron paramagnetic resonance
KW - Exchange interaction
KW - Lanthanide
KW - Lanthanoid, rare earth metal
KW - Single-molecule magnet
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U2 - 10.1016/j.poly.2017.03.008
DO - 10.1016/j.poly.2017.03.008
M3 - Article
AN - SCOPUS:85016168023
VL - 136
SP - 149
EP - 154
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
ER -