Abstract

The reaction of new 2,6-bis(pyrazol-3-yl)pyridine ligand (L) containing a redox-active ferrocenyl substituent with cobalt(II) salt gave the cobalt(II) complex [Co(L)₂](ClO₄)₂ (I), which was isolated in a pure state and characterized by elemental analysis, NMR spectroscopy, cyclic voltammetry, and X-ray diffraction. According to X-ray diffraction data (CIF file CCDC no. 2049714) and the Evans method, which allows determining the spin state of paramagnetic compounds in solution on the basis of NMR spectra, the cobalt(II) ion in complex I occurs in the high-spin state and does not undergo temperature-induced spin transition in the temperature range of 120–370 K.

中文翻译：

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钴(II) 2,6-双(吡唑-3-基)吡啶配合物与氧化还原活性二茂铁基取代基的自旋状态

摘要

含有氧化还原活性二茂铁基取代基的新 2,6-双(吡唑-3-基)吡啶配体 (L) 与钴 (II) 盐反应得到钴 (II) 配合物 [Co(L) ₂ ](ClO ₄ ) ₂ ( I )，以纯态分离并通过元素分析、核磁共振光谱、循环伏安法和X射线衍射表征。根据 X 射线衍射数据（CIF 文件 CCDC 编号 2049714）和 Evans 方法，该方法允许基于 NMR 光谱确定溶液中顺磁性化合物的自旋状态，配合物I中的钴 (II) 离子出现在高自旋状态，并且在 120-370 K 的温度范围内不会发生温度诱导的自旋跃迁。