Chemical trend on the lanthanide-radical exchange coupling

Takayuki Ishida; Takeshi Nakamura; Takumi Kihara; Hiroyuki Nojiri

doi:10.1016/j.poly.2017.03.008

Chemical trend on the lanthanide-radical exchange coupling

Takayuki Ishida, Takeshi Nakamura, Takumi Kihara, Hiroyuki Nojiri

Research output: Contribution to journal › Article

7 Citations (Scopus)

Abstract

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 J_Tb-rad/k_B = −4.47(4) K and J_Dy-rad/k_B = −3.2(4) K. Since the exchange coupling constant in [Gd(hfac)₃(TMIO)₂] has already been determined to be J_Gd-rad/k_B = −12.5(4) K from the magnetic susceptibility measurements, the lanthanide-dependence on |J_Ln-rad| was concluded as |J_Gd-rad| > |J_Tb-rad| > |J_Dy-rad| in this series.

Original language	English
Pages (from-to)	149-154
Number of pages	6
Journal	Polyhedron
Volume	136
DOIs	https://doi.org/10.1016/j.poly.2017.03.008
Publication status	Published - 2017 Nov 4

Keywords

Electron paramagnetic resonance
Exchange interaction
Lanthanide
Lanthanoid, rare earth metal
Single-molecule magnet

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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Ishida, T., Nakamura, T., Kihara, T., & Nojiri, H. (2017). Chemical trend on the lanthanide-radical exchange coupling. Polyhedron, 136, 149-154. https://doi.org/10.1016/j.poly.2017.03.008

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title = "Chemical trend on the lanthanide-radical exchange coupling",

abstract = "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.",

keywords = "Electron paramagnetic resonance, Exchange interaction, Lanthanide, Lanthanoid, rare earth metal, Single-molecule magnet",

author = "Takayuki Ishida and Takeshi Nakamura and Takumi Kihara and Hiroyuki Nojiri",

year = "2017",

month = nov,

day = "4",

doi = "10.1016/j.poly.2017.03.008",

language = "English",

volume = "136",

pages = "149--154",

journal = "Polyhedron",

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TY - JOUR

T1 - Chemical trend on the lanthanide-radical exchange coupling

AU - Ishida, Takayuki

AU - Nakamura, Takeshi

AU - Kihara, Takumi

AU - Nojiri, Hiroyuki

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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