PDF(Pubmed)
Abstract：
Coordination compounds, like iron(II) triazole complexes, exhibit spin crossover (SCO) behavior at around room temperature. Therefore, they are interesting for a variety of possible applications, and it is convenient to integrate them into polymers. Due to a reduction of the iron content and thus also 57Fe content in the sample through integration in polymers, Mössbauer measurements are only possible with greater difficulty or very long measurement times without expensive enrichment of the samples with 57Fe. So, other ways of improving the Mössbauer signal for these composite materials are necessary. Therefore, we pressed these composite materials to improve the Mössbauer spectra. In this study, we synthesized an iron(II) triazole spin crossover complex and an electrospun polymer complex composite nanofiber material including the same complex. For both products, Mössbauer measurements were performed at room temperature before and after using a press to show that the complex composite is not harmed through pressing. We investigate the influence of the pressing impact on the Mössbauer measurements in the context of measurement statistics and the measured signals. We show that pressing is not connected to any changes in the sample regarding the spin and oxidation state. We present that pressing improves the statistics of the Mössbauer measurements significantly. Furthermore, we use SEM measurements and PXRD to investigate whether or not the obtained fiber mats are destroyed in the pressing process.
摘要：
配位化合物,如铁(II)三唑配合物，在室温左右表现出自旋交叉(SCO)行为。因此,它们对于各种可能的应用都很有趣，将它们整合到聚合物中很方便。由于通过整合在聚合物中减少了样品中的铁含量，因此也减少了57Fe含量，只有在没有昂贵的57Fe富集样品的情况下,Mssbauer测量才有可能具有更大的难度或非常长的测量时间。所以,改善这些复合材料的穆斯堡尔信号的其他方法是必要的。因此,我们压制这些复合材料来改善穆斯堡尔谱。在这项研究中,我们合成了铁（II）三唑自旋交叉复合物和包含相同复合物的电纺聚合物复合物复合纳米纤维材料。对于这两种产品，在使用压机之前和之后在室温下进行Mössbauer测量,以表明复合复合材料不会通过压制而受到损害。我们在测量统计和测量信号的背景下研究了紧迫冲击对穆斯堡尔测量的影响。我们表明，压制与样品中有关自旋和氧化状态的任何变化无关。我们提出，按压显着改善了Mössbauer测量的统计数据。此外，我们使用SEM测量和PXRD来研究获得的纤维垫在压制过程中是否被破坏。
