New Octahedral, Head–Tail Iron(II) Complexes with Spin Crossover Properties
作者:Stephan Schlamp、Peter Thoma、Birgit Weber
DOI:10.1002/ejic.201101096
日期:2012.6
The synthesis and characterisation of four new Schiffbase-likeligands with long alkyl chains in the outer periphery and their iron(II) complexes with methanol and pyridine as axialligands is reported. Two of the methanol complexes crystallise in a lipid layer-like arrangement with the alkyl chain (tail) packed in the middle and the iron centres (head) in the outer sites. The pyridine complexes show
报道了四种新的类席夫碱配体的合成和表征,外周具有长烷基链,以及它们与甲醇和吡啶作为轴向配体的铁 (II) 配合物。两种甲醇复合物以脂质层状排列结晶,烷基链(尾部)位于中间,铁中心(头部)位于外部位点。吡啶配合物显示出不同类型的自旋转变(逐步、不完全、有滞后),这取决于配体外围的烷基链长度和取代基。使用 1 H NMR 光谱在溶液中的研究表明,自旋跃迁行为的差异是由于堆积效应,因为获得了与烷基链长度无关的相同跃迁曲线。
Cooperative spin transition in a lipid layer like system
作者:Stephan Schlamp、Birgit Weber、Anil D. Naik、Yann Garcia
DOI:10.1039/c1cc12162f
日期:——
A novel iron(II) mononuclear spin transition complex [FeL(py)2] displays an abrupt spin transition around 225 K accompanied by a very wide thermal hysteresis loop (∼50 K) that spreads out over 100 K. Crystal structure analysis in both low-spin and high-spin states reveals a lipid layer-like arrangement of the complex molecules and provides insights into the spin switching mechanism.
一种新型铁(II)单核自旋转变复合物[FeL(py)2]在 225 K 附近显示出突然的自旋转变,同时伴有一个非常宽的热滞后环(∼50 K),该热滞后环在 100 K 以上扩散。低自旋和高自旋状态下的晶体结构分析揭示了复合物分子的脂质层状排列,并为自旋转换机制提供了深入见解。