Unexpected stability of the iron(II) complex by an asymmetrical Schiff base from Fe(III): structure, magnetic and Mössbauer investigations.

IF 2.9 3区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Royal Society Open Science Pub Date : 2025-01-08 eCollection Date: 2025-01-01 DOI:10.1098/rsos.241334

Dawit Tesfaye, Mamo Gebrezgiabher, Jonas Braun, Taju Sani, Sebastien Diliberto, Pascal Boulet, Nandakumar Kalarikkal, Christopher E Anson, Annie K Powell, Madhu Thomas

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Abstract

The asymmetric Schiff base prepared in situ from ethylenediamine and pyridine-2-carboxaldehyde reacts with Fe(ClO₄)₃·6H₂O to form the Fe(II) complex [FeL₂](ClO₄)₂ with L = N,N-diethyl-N'-(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.

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来自Fe（III）的不对称席夫碱的铁（II）配合物的意外稳定性：结构，磁性和Mössbauer研究。

由乙二胺和吡啶-2-甲醛原位制备的不对称席夫碱与Fe(ClO4)3·6H2O反应生成Fe（II）配合物[FeL2](ClO4)2与L = N，N-二乙基-N'-（吡啶-2-基）亚甲基乙烷-1,2-二胺，其中Fe（III）原料意外还原为Fe（II）。通过元素分析、红外光谱、单晶和粉末x射线衍射、变温直流磁测量和室温Mössbauer光谱对该配合物进行了表征。不对称配体L通过其吡啶、亚甲基和氨基氮原子以三叉戟方式配位，在中心金属离子周围产生扭曲的八面体几何形状。变温磁研究和Mössbauer测量表明，铁被锁定在低自旋Fe（II）态。

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来源期刊

Royal Society Open Science Multidisciplinary-Multidisciplinary

CiteScore

6.00

自引率

0.00%

发文量

508

审稿时长

14 weeks

期刊介绍： Royal Society Open Science is a new open journal publishing high-quality original research across the entire range of science on the basis of objective peer-review. The journal covers the entire range of science and mathematics and will allow the Society to publish all the high-quality work it receives without the usual restrictions on scope, length or impact.