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Abstract <p>The reaction between 1-(5-hydroxy-1-methyl-3-(pyridin-2-yl)-1<i>H</i>-pyrazol-4-yl)ethan-1-one (L) and manganese(II) acetate afforded two new manganese(II) complexes with <i>trans</i> and <i>cis</i> configurations of the acylpyrazolone ligands—<i>trans</i>-L<sub>2</sub>Mn(MeOH)<sub>2</sub> (<i>trans</i>-<b>I</b>) and <i>cis</i>-L<sub>2</sub>Mn(MeOH)<sub>2</sub> (<i>cis</i>-<b>I</b>),—characterized by elemental analysis and X-ray diffraction (CCDC nos. 2408806 and 2408805, respectively). The less stable (<i>cis</i>-<b>I</b>) complex was obtained by introducing 2,2′-bipyridine into the reaction, presumably leading to the formation of an intermediate heteroleptic complex with L and 2,2′-bipyridine. The resulting isomeric complexes exhibit different molecular geometries and supramolecular organization in the crystal but convert into the more stable (<i>trans</i>-<b>I</b>) isomer in DMF solution. According to magnetometry and EPR spectroscopy, they display slightly different magnetic properties.</p>

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cis- and trans-Isomerism in Manganese(II) Complexes with Acylpyrazolonepyridine

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • I. A. Nikovskii,
  • A. N. Sinel’nikov,
  • A. S. Bogomyakov,
  • A. V. Borodulina,
  • Yu. V. Nelyubina

摘要

Abstract

The reaction between 1-(5-hydroxy-1-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl)ethan-1-one (L) and manganese(II) acetate afforded two new manganese(II) complexes with trans and cis configurations of the acylpyrazolone ligands—trans-L2Mn(MeOH)2 (trans-I) and cis-L2Mn(MeOH)2 (cis-I),—characterized by elemental analysis and X-ray diffraction (CCDC nos. 2408806 and 2408805, respectively). The less stable (cis-I) complex was obtained by introducing 2,2′-bipyridine into the reaction, presumably leading to the formation of an intermediate heteroleptic complex with L and 2,2′-bipyridine. The resulting isomeric complexes exhibit different molecular geometries and supramolecular organization in the crystal but convert into the more stable (trans-I) isomer in DMF solution. According to magnetometry and EPR spectroscopy, they display slightly different magnetic properties.