Ferromagnetic ordering of Fe(III) d spins of FeBr4- ions in (ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide) x FeBr4.
Ferromagnetic ordering of Fe(III) d spins of FeBr4- ions in (ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide) x FeBr4.
复制标题
(亚乙基二硫四硫富瓦烯硫醌-亚乙基二硫-1,3-二硫代甲基化物) x FeBr4 中 FeBr4- 离子的 Fe(III) d 自旋的铁磁有序性。
DOI：
10.1021/ic0482988
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发表时间：
2005
影响因子：
4.6
通讯作者：
T. Ishida
中科院分区：
文献类型：
--
作者：
Mingxing Wang;H. Fujiwara;T. Sugimoto;S. Noguchi;T. Ishida
制备了一种新的给体分子亚乙基二硫代四硫富瓦烯硫醌-亚乙基二硫代-1，3-二硫代戊烯甲基化物（1）与FeBr 4-离子的1：1盐，发现其室温电导率为4 × 10（-2）S cm（-1），半导体行为的活化能为170 meV。顺磁磁化率服从Curie-韦斯定律，居里常数为4.42 emu K mol（-1），外韦斯温度为+3.4 K，低于15 K时，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，最终导致铁磁有序化，其温度（TC）使用谐振电路方法确定为1.8 +/-0.2K。磁化强度的磁场依赖性表明，磁化饱和完成在约。60 kOe，饱和值约为0.65 kOe。5 μ B，这非常接近仅由于一个FeBr 4-离子的Fe（III）（S = 5/2）d自旋而获得的值。
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.