Metallic conductivity and ferromagnetic interaction of iron(III) d spins in the needle crystals of (ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide)(2).FeBr(4) salt.
Metallic conductivity and ferromagnetic interaction of iron(III) d spins in the needle crystals of (ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide)(2).FeBr(4) salt.
复制标题
(亚乙基二硫代四硫富戊烯醌-1,3-二硫代甲基化物)(2).FeBr(4) 盐针状晶体中铁(III) d 自旋的金属电导率和铁磁相互作用。
DOI：
10.1021/ic020143h
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发表时间：
2002
影响因子：
4.6
通讯作者：
Kazuko Takahashi
中科院分区：
文献类型：
--
作者：
T. Matsumoto;T. Kominami;K. Ueda;T. Sugimoto;T. Tada;S. Noguchi;H. Yoshino;K. Murata;M. Shiro;E. Negishi;N. Toyota;S. Endo;Kazuko Takahashi
得到了ethylenedithiotetrathiafulvalenoquinone-1，3-dithiolemethide(1)与FeBr(4)(-)和Gabr(4)(-)反阴离子的2：1电荷转移盐(1(2).FeBr4和1(2).GaBr4)，它们的结构几乎相同。1分子形成一维堆积的柱，改变其分子轴方向，而反阴离子与1堆积的柱平行排列，其扭曲的四面体几何构型保持不变。测得1(2).FeBr4和1(2).GaBr4单晶的室温电导率分别为4.6和2.1 S cm(-1)。从它们的电导率与温度的关系来看，它们的导电性能在170-300K之间是金属的，但在170K以下转变为半导体并持续到5K，尽管激活能很小(4-10 meV)。对于1(2).FeBr4，在约1-300K温度范围内，FeBr4(-)离子的d自旋之间发生了非常弱的反铁磁相互作用，但在约15K以下，铁磁相互作用是反优先的，可能是由于pi自旋1的参与。
The 2:1 charge-transfer (CT) salts (1(2).FeBr(4) and 1(2).GaBr(4)) of ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide (1) with FeBr(4)(-) and GaBr(4)(-) counteranions were obtained as needle crystals, whose structures are almost the same as each other. The 1 molecules form a one dimensionally stacked column with alternation of their molecular axis direction, while the counteranions are aligned in parallel with the 1-stacked columns with the direction of their distorted-tetrahedral geometry maintained. The room-temperature electrical conductivities measured on the single crystals of 1(2).FeBr(4) and 1(2).GaBr(4) were 4.6 and 2.1 S cm(-1), respectively. From the temperature dependences of their electrical conductivities in both cases the electrical conducting properties were metallic between ca. 170 and 300 K, but below ca. 170 K converted to be semiconducting and continued till 5 K, although the activation energies are very small (4-10 meV). For 1(2).FeBr(4) very weak and antiferromagnetic interaction occurred between the d spins of FeBr(4)(-) ions in the temperature range of ca. 1-300 K. However, below ca. 15 K the ferromagnetic interaction was reversely preferential possibly by participation of the pi spin of 1.