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Abstract <p>Reaction of a new representative of the 2,6-bis(pyrazol-3-yl)pyridine series (L) containing protonatable amino groups with iron(II) perchlorate hexahydrate yielded a new complex [Fe(L)<sub>2</sub>](ClO<sub>4</sub>)<sub>2</sub>, which was characterized by X-ray diffraction analysis (CCDC no. 2448780), and the possibility of its in situ protonation by tetrafluoroboric acid was evaluated. Using an approach based on the analysis of temperature-dependent changes in the <sup>1</sup>H NMR chemical shifts, it was established that in the temperature range 200–325 K, the obtained complex exists in the high-spin state, which is retained both in the presence of the protonating agent (HBF<sub>4</sub>) in solution and in the crystalline state.</p>

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Spin State of the Iron(II) Complex with a New Representative of the 2,6-Bis(pyrazol-3-yl)pyridine Series and the Effect of Protonation in Solution

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • E. S. Safiullina,
  • I. A. Nikovskii,
  • E. P. Antoshkina,
  • Yu. V. Nelyubina

摘要

Abstract

Reaction of a new representative of the 2,6-bis(pyrazol-3-yl)pyridine series (L) containing protonatable amino groups with iron(II) perchlorate hexahydrate yielded a new complex [Fe(L)2](ClO4)2, which was characterized by X-ray diffraction analysis (CCDC no. 2448780), and the possibility of its in situ protonation by tetrafluoroboric acid was evaluated. Using an approach based on the analysis of temperature-dependent changes in the 1H NMR chemical shifts, it was established that in the temperature range 200–325 K, the obtained complex exists in the high-spin state, which is retained both in the presence of the protonating agent (HBF4) in solution and in the crystalline state.