Abstract

The reactions of 2,6-bis(1,4-diphenyl-5-hydroxy-1H-pyrazol-3-yl)pyridine (L), which is the first representative of a series of 2,6-bis(pyrazol-3-yl)pyridine ligands bearing substituents in positions 1 and 4 of the pyrazol-3-yl ring, with the divalent iron and cobalt salts afford new Со(II) and Fe(II) complexes: [Co(L)₂](ClO₄)₂ (I) and [Fe(L)₂](ClO₄)₂ (II). The compounds are isolated in the individual state and characterized by elemental analysis, NMR spectroscopy, and X-ray diffraction analysis (CIF files CCDC nos. 1967892 (I) and 1967893 (II)). According to the data obtained, the transition metal ion in complexes I and II exists in the high-spin state (S = 3/2 for Co(II) and S = 2 for Fe(II)) in a range of 120–345 K, and the proposed modification of the ligand does not lead to the temperature-induced spin transition in both the solution and crystalline state.

中文翻译：

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具有2,6-双（1,4-二苯基-5-羟基-1 H-吡唑-3-基）吡啶的铁（II）和钴（II）配合物：合成，结构和自旋态

摘要

2,6-双（1,4-二苯基-5-羟基-1 H-吡唑-3-基）吡啶（L）的反应是一系列2,6-双（吡唑-在吡唑-3-基环的1和4位带有取代基的3-基）吡啶配体与二价铁盐和钴盐提供新的Со（II）和Fe（II）配合物：[Co（L）₂ ]（ ClO ₄）₂（I）和[Fe（L）₂ ]（ClO ₄）₂（II）。这些化合物以单独状态分离，并通过元素分析，NMR光谱和X射线衍射分析（CIF文件CCDC 1967892（I）和1967893（II））。根据获得的数据，配合物I和II中的过渡金属离子以高自旋状态存在（Co（II）为S = 3/ 2，Fe（II）为S = 2），范围为120-345 K和拟议的配体修饰在溶液和结晶态均不会导致温度诱导的自旋转变。