Abstract
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 1А1 ⇔ 5Т2. 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).
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ACKNOWLEDGMENTS
The authors are grateful to N.P. Korotkevich (Nikolaev Institute of Inorganic Chemistry) for recording the X-ray diffraction patterns, I.V. Yushina (Nikolaev Institute of Inorganic Chemistry) for recording the diffuse reflectance spectra, and S.A. Petrov (Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences) for measuring the Mössbauer spectra.
Funding
This work was supported in part by the Russian Foundation for Basic Research (project no. 18-53-00006 Bel a).
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Translated by E. Glushachenkova
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Lavrenova, L.G., Dyukova, I.I., Korotaev, E.V. et al. Spin Crossover in New Iron(II) Complexes with 2,6-Bis(benzimidazole-2-yl)pyridine. Russ. J. Inorg. Chem. 65, 30–35 (2020). https://doi.org/10.1134/S0036023620010106
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DOI: https://doi.org/10.1134/S0036023620010106