Synthesis and Spin State of the Iron(II) Complex with the N,N'-Disubstituted 2,6-Bis(pyrazol-3-yl)pyridine Ligand

Abstract

The reaction of a new tridentate ligand 2,6-bis(5-tert-butyl-1-(2,6-difluorophenyl)-1H-pyrazol-3-yl)pyridine (L) with the divalent iron salt affords the iron(II) complex [Fe(L)2](BF4)2 (I), which is isolated in the individual state and characterized by elemental analysis, NMR spectroscopy, and X-ray diffraction analysis. According to the X-ray diffraction results and data of the Evans method, which makes it possible to determine the spin state of paramagnetic compounds in a solution from the NMR spectra, the iron(II) ion in complex I exists in the high-spin state (S = 2 for Fe(II)) and undergoes no temperature-induced spin transition in a range of 120–345 K.

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Funding

The XRD studies of the metal complexes were collected with a support from the Ministry of Science and Higher Education of the Russian Federation using the scientific equipment of the Center of Molecular Structure Investigation at the Nesmeyanov Institute of Organoelement Compounds (Russian Academy of Sciences).

This work was supported by the Russian Science Foundation, project no. 17-13-01456.

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Correspondence to Yu. V. Nelyubina.

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The authors declare that they have no conflicts of interest.

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The authors congratulate Academician I.L. Eremenko with a 70th birthday

Translated by E. Yablonskaya

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Nikovskii, I.A., Polezhaev, A.V., Aleshin, D.Y. et al. Synthesis and Spin State of the Iron(II) Complex with the N,N'-Disubstituted 2,6-Bis(pyrazol-3-yl)pyridine Ligand. Russ J Coord Chem 46, 402–410 (2020). https://doi.org/10.1134/S107032842006007X

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Keywords:

  • bis(pyrazolyl)pyridines
  • cobalt complexes
  • Evans method
  • X-ray diffraction analysis
  • spin state
  • NMR spectroscopy