Anion−π and Halide–Halide Nonbonding Interactions in a New Ionic Liquid Based on Imidazolium Cation with Three-Dimensional Magnetic Ordering in the Solid State
作者:Abel García-Saiz、Imanol de Pedro、Pedro Migowski、Oriol Vallcorba、Javier Junquera、Jesús Angel Blanco、Oscar Fabelo、Denis Sheptyakov、Joao Carlos Waerenborgh、María Teresa Fernández-Díaz、Jordi Rius、Jairton Dupont、Jesús Antonio Gonzalez、Jesús Rodríguez Fernández
DOI:10.1021/ic500882z
日期:2014.8.18
the first magnetic phase of an ionic liquid with anion−π interactions, which displays a three-dimensional (3D) magnetic ordering below the Néel temperature, TN = 7.7 K. In this material, called Dimim[FeBr4], an exhaustive and systematic study involving structural and physical characterization (synchrotron X-ray, neutron powder diffraction, direct current and alternating current magnetic susceptibility
我们介绍了具有阴离子-π相互作用的离子液体的第一磁相,该相在Néel温度T N = 7.7 K时显示出三维(3D)磁序。在这种材料中,称为Dimim [FeBr 4 ],详尽而系统的研究,包括结构和物理表征(同步辐射X射线,中子粉末衍射,直流和交流磁化率,磁化强度,热容量,拉曼和莫斯鲍尔测量)以及第一性原理分析(密度泛函理论(DFT) )模拟)。通过帕特森函数直接法求解的晶体结构在室温下显示出单斜晶相(P 2 1对称性),并且具有= 6.745(3)Å,b = 14.364(3)Å,c = 6.759(3)Å,β= 90.80(2)°。其框架沿b方向投影,其特征是阳离子层[Dimim] +和阴离子[FeBr 4 ] -层与层之间的方向发生了变化,Fe···Fe的距离大于6.7。磁化测量表明,在T N以下存在3D反铁磁有序,并且存在明显的磁晶各向异性。从低温中子衍射数据可以看出,反铁磁序的存在是由[FeBr