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

IF 1.1 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Coordination Chemistry Pub Date : 2025-06-06 DOI:10.1134/S1070328424601547

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

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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.

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锰（II）与酰基吡唑啉配合物的顺式和反式异构

1-（5-羟基-1-甲基-3-（吡啶-2-基）- 1h -吡唑-4-基）-1 -1- 1 (L)与醋酸锰（II）的反应产生了两个新的锰（II）配合物，它们具有酰基吡唑酮配体的反式和顺式构型：反式l2mn (MeOH)2（反式- i）和顺式l2mn (MeOH)2（顺式- i），元素分析和x射线衍射分别对其进行了表征（CCDC号：2408806和2408805）。较不稳定的（顺式）配合物是通过将2,2 ' -联吡啶引入反应中得到的，这可能导致与L和2,2 ' -联吡啶形成中间杂电络合物。所得到的异构体在晶体中表现出不同的分子几何形状和超分子组织，但在DMF溶液中转化为更稳定的（反式）异构体。根据磁强计和EPR光谱，它们显示出略有不同的磁性。

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来源期刊

Russian Journal of Coordination Chemistry 化学-无机化学与核化学

CiteScore

2.40

自引率

15.80%

发文量

审稿时长

7.2 months

期刊介绍： Russian Journal of Coordination Chemistry is a journal that publishes reviews, original papers, and short communications on all aspects of theoretical and experimental coordination chemistry. Modern coordination chemistry is an interdisciplinary science that makes a bridge between inorganic, organic, physical, analytical, and biological chemistry.