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EPR of the first Fe(III)-containing spin-crossover metallomesogens

机译：第一种含Fe（III）的自旋交联金属成矿剂的EPR

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摘要

The low-spin (LS) to high-spin (HS) transition in two mesogenic Fe(III) complexes with alkyloxysalicyliden-N'-ethyl-N-etllylendiamine as ligands is studied by electron paramagnetic resonance (EPR). The symmetrization of the crystal field around the Fe(III) ion tinder first heating of a polycrystalline sample from the room temperature was observed in the spectra of I-IS complexes. The line narrowing (from 45 to 15 mT) under the crystal-smectic phase transition is explained by the strengthening of the intermolecular exchange interaction, as a result of the structural reorganization of layers in the smectic phase. A feature of both mesogenic spin-transition systems is all unusual field-induced spin instability which leads to the hysteresis of the HS-LS composition. This instability is detected by EPR and magnetic susceptibility methods. The alignment of systems by magnetic field in the mesophase and a complete or partial orientational order under cooling the mesophase to the glass state are the main reason for this hysteresis. The influence of UPR-silent LS complexes reveals itself in the line broadening of HS compounds' when the temperature is lowered from 220 K.
机译：通过电子顺磁共振（EPR）研究了两种介晶Fe（III）配合物中的低自旋（LS）到高自旋（HS）的转变，其中烷氧基水杨醛-N'-乙基-N-乙二胺为配体。在I-IS络合物的光谱中观察到，从室温开始，多晶样品的Fe（III）离子束先加热周围的晶体场对称。晶体-近晶相转变下的线变窄（从45 mT到15 mT）是由于近晶相中各层的结构重组导致的分子间交换相互作用的增强所致。两种介晶自旋转变系统的一个特征是所有异常的磁场诱导的自旋不稳定性，这导致HS-LS成分的滞后。通过EPR和磁化率方法可以检测到这种不稳定性。导致磁滞的主要原因是中间相中的磁场对系统的定向以及在将中间相冷却至玻璃态的情况下的全部或部分取向顺序。当温度从220 K降低时，UPR沉默LS配合物的影响在HS化合物的谱线展宽中得以体现。

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