来自Fe(III)的不对称席夫碱形成的铁(II)配合物的意外稳定性：结构、磁性和穆斯堡尔研究
Unexpected stability of the iron(II) complex by an asymmetrical Schiff base from Fe(III): structure, magnetic and Mössbauer investigations.
作者信息
Tesfaye Dawit, Gebrezgiabher Mamo, Braun Jonas, Sani Taju, Diliberto Sebastien, Boulet Pascal, Kalarikkal Nandakumar, Anson Christopher E, Powell Annie K, Thomas Madhu
机构信息
Department of Industrial Chemistry, College of Natural and Applied Sciences, Addis Ababa Science and Technology University, PO Box 16417, Addis Ababa, Ethiopia.
Nanotechnology Center of Excellence, Addis Ababa Science and Technology University, PO Box 16417, Addis Ababa, Ethiopia.
出版信息
R Soc Open Sci. 2025 Jan 8;12(1):241334. doi: 10.1098/rsos.241334. eCollection 2025 Jan.
The asymmetric Schiff base prepared from ethylenediamine and pyridine-2-carboxaldehyde reacts with Fe(ClO)·6HO to form the Fe(II) complex FeL with L = ,-diethyl-'-(pyridin-2-yl)methylene)ethane-1,2-diamine, where the Fe(III) starting material has been unexpectedly reduced to Fe(II). This complex was characterized by elemental analysis, infrared spectra, single crystal and powder X-ray diffraction measurements, variable temperature DC magnetic measurement and room temperature Mössbauer spectroscopy. The asymmetric ligand L coordinates in a tridentate fashion through its pyridyl, azomethine and amino nitrogen atoms, generating a distorted octahedral geometry around the central metal ion. Variable temperature magnetic studies and a Mössbauer measurement show that the iron is locked in the low spin Fe(II) states.
由乙二胺和吡啶 - 2 - 甲醛制备的不对称席夫碱与Fe(ClO)₃·6H₂O反应，形成Fe(II)配合物FeL₃，其中L = N,N'-二乙基-N-(吡啶-2-基亚甲基)乙烷-1,2-二胺，起始原料Fe(III)意外地被还原为Fe(II)。通过元素分析、红外光谱、单晶和粉末X射线衍射测量、变温直流磁性测量和室温穆斯堡尔光谱对该配合物进行了表征。不对称配体L通过其吡啶基、甲亚胺基和氨基氮原子以三齿方式配位，在中心金属离子周围形成扭曲的八面体几何构型。变温磁性研究和穆斯堡尔测量表明，铁处于低自旋Fe(II)态。
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