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<p>Reaction of cobalt(II) acetate with neocuproine (<i>neoc</i>, 2,9-dimethyl-1,10-phenantroline) and Schiff base H<sub>2</sub>(<i>samphe</i>) (Schiff base formed by condensation of salicylaldehyde with 2-amino-4-methylphenol) afforded complex [Co(<i>neoc</i>)(<i>samphe</i>)] (<b>1</b>) which was chemically and spectroscopically characterized. Crystal structure of <b>1</b> is composed of neutral complex molecules in which the Co(II) atom is pentacoordinated and its coordination sphere is formed by one chelating <i>neoc</i> ligand and one tridentate dianionic chelating ligand <i>samphe</i><sup>2-</sup> (ONO-donor). Calculated <i>τ</i><sub><i>5</i></sub> value of 0.435 indicates that the coordination polyhedron can be viewed as an intermediate shape between a square pyramid and a trigonal bipyramid. The complex <b>1</b> displays enhanced thermal stability up to 330&#xa0;°C. The magnetic study of <b>1</b> has shown that Co(II) is in a high-spin state <i>S</i> = 3/2 and exhibits easy-axis magnetic anisotropy with parameters <i>D</i> = -48.7&#xa0;cm<sup>-1</sup> and <i>E/D</i> = 0.166. The AC magnetic study indicates the presence of field-supported slow magnetic relaxation with a maximum of the imaginary component above 10&#xa0;kHz. The results of the magnetic study are supported by theoretical calculations.</p> Graphical abstract <p></p>

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Pentacoordinate Co(II) complex based on bulky tridentate and bidentate ligands with field-supported slow magnetic relaxation

  • 期刊论文

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  • 发表日期：

    2026年3月3日

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  • Marek Szabó Dózsa,
  • Richard Smolko,
  • Erika Samoľová,
  • Erik Čižmár,
  • Juraj Černák

摘要

Reaction of cobalt(II) acetate with neocuproine (neoc, 2,9-dimethyl-1,10-phenantroline) and Schiff base H2(samphe) (Schiff base formed by condensation of salicylaldehyde with 2-amino-4-methylphenol) afforded complex [Co(neoc)(samphe)] (1) which was chemically and spectroscopically characterized. Crystal structure of 1 is composed of neutral complex molecules in which the Co(II) atom is pentacoordinated and its coordination sphere is formed by one chelating neoc ligand and one tridentate dianionic chelating ligand samphe2- (ONO-donor). Calculated τ5 value of 0.435 indicates that the coordination polyhedron can be viewed as an intermediate shape between a square pyramid and a trigonal bipyramid. The complex 1 displays enhanced thermal stability up to 330 °C. The magnetic study of 1 has shown that Co(II) is in a high-spin state S = 3/2 and exhibits easy-axis magnetic anisotropy with parameters D = -48.7 cm-1 and E/D = 0.166. The AC magnetic study indicates the presence of field-supported slow magnetic relaxation with a maximum of the imaginary component above 10 kHz. The results of the magnetic study are supported by theoretical calculations.

Graphical abstract