Abstract

The reaction of a new tridentate ligand 2,6-bis(5-tert-butyl-1-(2,6-difluorophenyl)-1H-pyrazol-3-yl)pyridine (L) with the divalent iron salt affords the iron(II) complex [Fe(L)₂](BF₄)₂ (I), which is isolated in the individual state and characterized by elemental analysis, NMR spectroscopy, and X-ray diffraction analysis. According to the X-ray diffraction results and data of the Evans method, which makes it possible to determine the spin state of paramagnetic compounds in a solution from the NMR spectra, the iron(II) ion in complex I exists in the high-spin state (S = 2 for Fe(II)) and undergoes no temperature-induced spin transition in a range of 120–345 K.

中文翻译：

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N，N'-二取代的2,6-双（吡唑-3-基）吡啶配体的铁（II）配合物的合成和自旋态

摘要

新的三齿配体2,6-双（5-叔丁基-1-（2,6-二氟苯基）-1 H-吡唑-3-基）吡啶（L）与二价铁盐的反应提供了铁（II）络合物[Fe（L）₂ ]（BF ₄）₂（I），以单独状态分离，并通过元素分析，NMR光谱和X射线衍射分析进行了表征。根据Evans方法的X射线衍射结果和数据，这使得可以根据NMR光谱确定溶液中顺磁性化合物的自旋态，复合物I中的铁（II）离子存在于高自旋中状态（小号 对于Fe（II）= = 2，并且在120–345 K的范围内没有温度引起的自旋转变。