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Reprint of “EPR studies of a cyano-bridged {Fe2IIINiII} coordination complex and its corresponding FeIII mononuclear building-block”

Authors
Journal
Polyhedron
0277-5387
Publisher
Elsevier
Publication Date
Volume
66
Identifiers
DOI: 10.1016/j.poly.2013.08.002
Keywords
  • High-Field Electron Paramagnetic Resonance (Hf-Epr)
  • Low-Spin Feiii
  • Single-Molecule Magnet (Smm)
  • Tris-Pyrazoylborate
  • Cyano-Bridged Coordination Complex
  • Magnetoanisotropy
Disciplines
  • Physics

Abstract

Abstract High-field/frequency electron paramagnetic resonance measurements have been performed on a cyano-bridged trinuclear Fe2IIINiII complex and an analogous mononuclear FeIII building block. The mononuclear FeIII complex exhibits a low-spin configuration resulting from a strong-field coordination environment and can be modeled as an effective s=1/2 Kramers ion that exhibits significant g-anisotropy: gz=3.7, gy=2.2 and gx=1.92. The corresponding Fe2IIINiII complex possesses an S=2 spin ground state as a result of ferromagnetic exchange that is mediated by the bridging cyano ligands. Simulations of frequency dependent EPR data establish that the Fe2IIINiII complex exhibits easy-axis type magnetoanisotropy, with best-fit simulation parameters of: S=2, D=−2.09cm−1, E=0.08cm−1, B40=2.3×10−3cm−1, gz=2.4, gy=gx=1.95.

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