在（乙二硫基四硫富瓦烯硫代醌 - 乙二硫基 - 1,3 - 二硫代甲基化物）xFeBr₄中，FeBr₄⁻离子的Fe(III) d自旋的铁磁有序排列。

Ferromagnetic ordering of Fe(III) d spins of FeBr4- ions in (ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide) x FeBr4.

作者信息

Wang Mingxing, Fujiwara Hideki, Sugimoto Toyonari, Noguchi Satoru, Ishida Takekazu

机构信息

Research Institute for Advanced Science and Technology, Osaka Prefecture University, Osaka 599-8570, Japan.

出版信息

Inorg Chem. 2005 Mar 7;44(5):1184-6. doi: 10.1021/ic0482988.

DOI:10.1021/ic0482988

PMID:15732952

Abstract

The 1:1 salt of a new donor molecule, ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide (1), with FeBr4- ion, 1 x FeBr4, was prepared and found to exhibit a room-temperature electrical conductivity of 4 x 10(-2) S cm(-1) and semiconducting behavior with an activation energy of 170 meV. The paramagnetic susceptibility obeyed the Curie-Weiss law with a Curie constant of 4.42 emu K mol(-1) and a Weiss temperature of +3.4 K, and below 15 K, this short-range ferromagnetic interaction increasingly extended to two- and/or three-dimensional interactions, eventually giving rise to a ferromagnetic ordering, whose temperature (TC) was determined to be 1.8 +/- 0.2 K using a resonant circuit method. The magnetic field dependence of magnetization showed that the saturation of magnetization was accomplished at ca. 60 kOe and the saturated value was ca. 5 microB, which is very close to the value obtained only due to Fe(III) (S = 5/2) d spins of one FeBr4- ion.

摘要

制备了一种新供体分子乙二硫基四硫富瓦烯硫代醌 - 乙二硫基 -1,3 - 二硫环戊烯鎓（1）与FeBr₄⁻离子的1:1盐，即1×FeBr₄，发现其在室温下的电导率为4×10⁻² S cm⁻¹，具有半导体行为，激活能为170 meV。顺磁磁化率符合居里 - 外斯定律，居里常数为4.42 emu K mol⁻¹，外斯温度为 +3.4 K，在15 K以下，这种短程铁磁相互作用逐渐扩展到二维和/或三维相互作用，最终产生铁磁有序，使用谐振电路方法确定其温度（TC）为1.8±0.2 K。磁化强度的磁场依赖性表明，磁化强度在约60 kOe时达到饱和，饱和值约为5 μB，这与仅由一个FeBr₄⁻离子的Fe(III)（S = 5/2）d自旋获得的值非常接近。