Spin Crossover and Valence Tautomerism in Neutral Homoleptic Iron Complexes of Bis(pyridylimino)isoindolines.

Spin Crossover and Valence Tautomerism in Neutral Homoleptic Iron Complexes of Bis(pyridylimino)isoindolines.
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双(吡啶亚氨基)异吲哚啉中性均配铁配合物中的自旋交叉和价态互变异构

DOI:
10.1002/chem.201501551
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
M. Bröring
M. Bröring
中科院分区:
--
文献类型:
--
作者:
A. Scheja;D. Baabe;D. Menzel;C. Pietzonka;P. Schweyen;M. Bröring

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合成了6个吡啶基4位上具有不同取代基(H,Me,Et,tBu,OMe,NMe 2)的双(吡啶亚氨基)异吲哚啉(bpi)配体的均配铁配合物,并通过57 Fe穆斯堡尔谱、SQUID磁测量、单晶X射线衍射分析、X带EPR和1H NMR谱研究了它们的自旋和氧化还原态随温度的变化. 虽然H-、甲基-和乙基-取代的络合物保持在纯的高自旋状态,而与温度无关,4-叔丁基-取代的衍生物显示出自旋交叉行为。发现甲氧基和二甲氨基取代的化合物容易发生氧化。在结晶状态下,观察到甲氧基衍生物的价态互变异构行为,作为热激活的电荷转移跃迁,伴随着高于200 K的自旋交叉。 价态互变异构导致与bpi配体之一形成螯合物,作为二价阴离子自由基L2-,有效自旋S =2。
Homoleptic iron complexes of six bis(pyridylimino)isoindoline (bpi) ligands with different substituents (H, Me, Et,tBu, OMe, NMe2) at the 4‐positions of the pyridine moieties have been prepared and studied with regard to temperature‐dependent spin and redox states by a combination of57Fe Mössbauer spectroscopy, SQUID magnetometry, single‐crystal X‐ray diffraction analysis, X‐band EPR, and1H NMR spectroscopy. While the H‐, methyl‐, and ethyl‐substituted complexes remain in a pure high‐spin state irrespective of the temperature, the 4‐tert‐butyl‐substituted derivative shows spin‐crossover behavior. The methoxy‐ and dimethylamino‐substituted compounds were found to easily undergo oxidation. In the crystalline state, valence tautomeric behavior was observed for the methoxy derivative as a thermally activated charge‐transfer transition, accompanied by a spin crossover above 200 K. The valence tautomerism leads to a chelate with one of the bpi ligands as a dianion radical L2−.and with an effective spin ofS=2.
子午N3配体对羧基铜(II)配合物超分子组装和氧化还原行为的影响
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