Field-Induced Slow Magnetic Relaxation in an Octacoordinated Fe(II) Complex with Pseudo-D2d Symmetry: Magnetic, HF-EPR, and Theoretical Investigations

Guo Ling Li, Shu Qi Wu, Li Fang Zhang, Zhenxing Wang, Zhong Wen Ouyang, Zhong Hai Ni, Sheng Qun Su, Zi Shuo Yao, Jun Qiu Li, Osamu Sato

研究成果: ジャーナルへの寄稿学術誌査読

17 被引用数 (Scopus)

抄録

An octacoordinated Fe(II) complex, [FeII(dpphen)2](BF4)2·1.3H2O (1; dpphen = 2,9-bis(pyrazol-1-yl)-1,10-phenanthroline), with a pseudo-D2d-symmetric metal center has been synthesized. Magnetic, high-frequency/-field electron paramagnetic resonance (HF-EPR), and theoretical investigations reveal that 1 is characterized by uniaxial magnetic anisotropy with a negative axial zero-field splitting (ZFS) (D ≈ -6.0 cm-1) and a very small rhombic ZFS (E ≈ 0.04 cm-1). Under applied dc magnetic fields, complex 1 exhibits slow magnetic relaxation at low temperature. Fitting the relaxation time with the Arrhenius mode combining Orbach and tunneling terms affords a good fit to all the data and yields an effective energy barrier (17.0 cm-1) close to the energy gap between the ground state and the first excited state. The origin of the strong uniaxial magnetic anisotropy for 1 has been clearly understood from theoretical calculations. Our study suggests that high-coordinated compounds featuring a D2d-symmetric metal center are promising candidates for mononuclear single-molecule magnets.

本文言語英語
ページ(範囲)8018-8025
ページ数8
ジャーナルInorganic chemistry
56
14
DOI
出版ステータス出版済み - 7月 17 2017

!!!All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 無機化学

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