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Abstract <p>The reaction of new 2-(2,6-dichlorophenyl)-5-(pyridin-2-yl)-2,4-dihydro-3<i>H</i>-pyrazol-3-one (L) with nickel(II) chloride resulted in the synthesis of the mononuclear nickel(II) complex [L<sub>2</sub>Ni(CH<sub>3</sub>OH)]Cl (<b>I</b>). The methanol solvate of complex <b>I</b>, [L<sub>2</sub>Ni(CH<sub>3</sub>OH)]Cl·3CH<sub>3</sub>OH, and the free ligand L were characterized by X-ray diffraction (CCDC no. 2314989 (<b>I</b>), 2314988 (L)). It was shown that free L exists in solution in the pyrazolone form (according to the <sup>1</sup>H NMR data), while in crystalline complex <b>I</b>, L is in the pyrazolol form (X-ray diffraction data). Compound <b>I</b> is a rare example of a pyrazolol complex in which the oxygen atom is not involved in the coordination to the transition metal ion to give a coordination polymer.</p>

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Synthesis of Nickel(II) Complexes with 2,6-Dichlorophenyl-Substituted Pyridylpyrazole

  • 期刊论文

  • 发表日期：

    2025年2月1日

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

摘要

Abstract

The reaction of new 2-(2,6-dichlorophenyl)-5-(pyridin-2-yl)-2,4-dihydro-3H-pyrazol-3-one (L) with nickel(II) chloride resulted in the synthesis of the mononuclear nickel(II) complex [L2Ni(CH3OH)]Cl (I). The methanol solvate of complex I, [L2Ni(CH3OH)]Cl·3CH3OH, and the free ligand L were characterized by X-ray diffraction (CCDC no. 2314989 (I), 2314988 (L)). It was shown that free L exists in solution in the pyrazolone form (according to the 1H NMR data), while in crystalline complex I, L is in the pyrazolol form (X-ray diffraction data). Compound I is a rare example of a pyrazolol complex in which the oxygen atom is not involved in the coordination to the transition metal ion to give a coordination polymer.