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Abstract <p>Cobalt(II) complexation with azaheterocyclic ligands L (L = 2,2'-bipyridyl, 1,10-phenanthroline, and 2,2'-bipyridylamine) in the presence of a monohydroxy-substituted derivative of the <i>closo</i>-dodecaborate anion [B<sub>12</sub>H<sub>11</sub>OH]<sup>2–</sup> has been studied. Depending on the nature of the organic ligand and the synthesis conditions, coordination compounds [Co<sup>III</sup>(Bipy)<sub>2</sub>Cl<sub>2</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>11</sub>OH], [Co<sup>II</sup>(Phen)<sub>3</sub>][B<sub>12</sub>H<sub>11</sub>OH] and [Co<sup>II</sup>(Bipy)<sub>3</sub>][B<sub>12</sub>H<sub>11</sub>OH] with the boron cluster anion as a counterion, as well as the mixed-ligand complex [Co<sup>II</sup>(BPA)<sub>2</sub>Cl<sub>2</sub>] of a known structure, have been isolated and characterized by X-ray diffraction. For the first time, a redox reaction leading to the formation of a cobalt(III) complex in air has been observed for a system containing cobalt(II) and a substituted derivative of the boron cluster anion without the introduction of additional oxidizing agents.</p>

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Features of Cobalt(II) Complexation with Azaheteracyclic Ligands in the Presence of a Monohydroxy-Substituted Derivative of the closo-Dodecaborate Anion

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • E. Yu. Matveev,
  • S. E. Nikiforova,
  • A. S. Kubasov,
  • E. A. Malinina,
  • K. Yu. Zhizhin,
  • N. T. Kuznetsov

摘要

Abstract

Cobalt(II) complexation with azaheterocyclic ligands L (L = 2,2'-bipyridyl, 1,10-phenanthroline, and 2,2'-bipyridylamine) in the presence of a monohydroxy-substituted derivative of the closo-dodecaborate anion [B12H11OH]2– has been studied. Depending on the nature of the organic ligand and the synthesis conditions, coordination compounds [CoIII(Bipy)2Cl2]2[B12H11OH], [CoII(Phen)3][B12H11OH] and [CoII(Bipy)3][B12H11OH] with the boron cluster anion as a counterion, as well as the mixed-ligand complex [CoII(BPA)2Cl2] of a known structure, have been isolated and characterized by X-ray diffraction. For the first time, a redox reaction leading to the formation of a cobalt(III) complex in air has been observed for a system containing cobalt(II) and a substituted derivative of the boron cluster anion without the introduction of additional oxidizing agents.