Spin Crossover in New Iron(II) Complexes with 2,6-Bis(benzimidazole-2-yl)pyridine

L. G. Lavrenova, I. I. Dyukova, E. V. Korotaev, L. A. Sheludyakova, V. A. Varnek

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2 Citations (Scopus)


New coordination compounds of iron(II) sulfate, hexafluorosilicate, and perrhenate with 2,6-bis(benzimidazole-2-yl)pyridine (L), namely, [FeL2]SO4 ∙ H2O (I), [FeL2]SiF6 ∙ H2O (II), and [FeL2](ReO4)2 ∙ 1.5H2O (III) have been synthesized. The complexes have been studied by static magnetic susceptibility, electronic (diffuse reflectance), IR, and Mössbauer spectroscopy, and X-ray diffraction. The μeff(T) study of dehydrated complexes I–III (1–3) within the range 80–520 K has shown the spin transition 1А15Т2. A two-stage transition is observed in complex 1, whereas one-stage transitions occur in complexes 2 and 3. The forward spin transition temperatures (Тс↑) of complexes 1–3 are 423 and 503, 476, 362 K, respectively. Complex 3 sustains an abrupt spin transition with a hysteresis in the μeff(T) curve (ΔT = 21 K).

Original languageEnglish
Pages (from-to)30-35
Number of pages6
JournalRussian Journal of Inorganic Chemistry
Issue number1
Publication statusPublished - Jan 2020


  • diffuse reflectance spectroscopy
  • IR and Mössbauer spectroscopy
  • spin crossover
  • synthesis
  • IR and Mossbauer spectroscopy

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