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<p>The synthesis of a series of mononuclear Fe(III) and Co(III) complexes with <i>N′</i>-(3,5-di-<i>tert</i>-butyl-2-hydroxybenzylidene)-4-nitrobenzohydrazide (H<sub>2</sub>L) is presented in this article. The structure of all complexes was determined by single-crystal X-ray diffraction analysis. The confirmation of ligand’s coordination type in anionic or dianionic form and the distorted octahedral coordination environment is based on studies—using alternative methods, IR and UV–vis spectroscopy. A single-crystal-to-single-crystal phase transition was observed in the [Fe<sup>III</sup>(HL)<sub>2</sub>]<sub>2</sub>(ClO<sub>4</sub>)<sub>2</sub>·4MeOH complex. Evaluation of the biological activity of the complexes against the Gram-positive strain of <i>Staphylococcus aureus</i> and the Gram-negative strain of <i>Escherichia coli</i> showed a higher bactericidal activity compared with acylhydrazone.</p> Graphical abstract <p></p>

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The initial salt and solvent effect on crystal structure and biological properties of Fe(III) and Co(III) complexes with different tautomeric forms of N′-(3,5-di-tert-butyl-2-hydroxybenzylidene)-4-nitrobenzohydrazide

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Anna K. Matiukhina,
  • Ekaterina N. Zorina-Tikhonova,
  • Veronika A. Novikova,
  • Natalia V. Gogoleva,
  • Daniil O. Blinou,
  • Maxim A. Bastrakov,
  • Alexandra E. Svyatogorova,
  • Leonid N. Fetisov,
  • Viktoria V. Chekrysheva,
  • Alexander A. Zubenko,
  • Mikhail A. Kiskin,
  • Igor L. Eremenko

摘要

The synthesis of a series of mononuclear Fe(III) and Co(III) complexes with N′-(3,5-di-tert-butyl-2-hydroxybenzylidene)-4-nitrobenzohydrazide (H2L) is presented in this article. The structure of all complexes was determined by single-crystal X-ray diffraction analysis. The confirmation of ligand’s coordination type in anionic or dianionic form and the distorted octahedral coordination environment is based on studies—using alternative methods, IR and UV–vis spectroscopy. A single-crystal-to-single-crystal phase transition was observed in the [FeIII(HL)2]2(ClO4)2·4MeOH complex. Evaluation of the biological activity of the complexes against the Gram-positive strain of Staphylococcus aureus and the Gram-negative strain of Escherichia coli showed a higher bactericidal activity compared with acylhydrazone.

Graphical abstract