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Spin-crossover phenomenon and intermolecular interaction for the assembled Fe(II) complexes having aromatic rings

Authors
  • Iwai, Saki1
  • Nakashima, Satoru1, 2
  • 1 Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan , Higashi-Hiroshima (Japan)
  • 2 Natural Science Center for Basic Research and Development, Hiroshima University, 1-4-2, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan , Higashi-Hiroshima (Japan)
Type
Published Article
Journal
Hyperfine Interactions
Publisher
Springer International Publishing
Publication Date
Apr 23, 2020
Volume
241
Issue
1
Identifiers
DOI: 10.1007/s10751-020-01719-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

Assembled Fe(II) complex, [Fe(NCS)2(1,5-bpna)2·(0.6CH2Cl2)(C2H5OH)]n (powder sample) (1,5-bpna = 1,5-bis(4-pyridyl)naphthalene), was synthesized. The powder sample showed slight decrease in magnetic susceptibility with decreasing temperature. Small amount of low-spin state was observed in Mössbauer spectrum at 78 K for the powder sample, suggesting incomplete spin-crossover phenomenon. Single crystal of [Fe(NCS)2(1,5-bpna)2·(toluene)]n was obtained. Magnetic susceptibility for [Fe(NCS)2(1,5-bpna)2·(toluene)]n revealed high-spin state at all temperature region. X-ray structural analysis revealed the CH-π interaction between bridging ligand and guest toluene. Such interaction forced parallel structure around iron atom, which inhibits the decrease in Fe-N distance to become low-spin state.

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