Synthesis of a new donor, BEDT-HBDST and crystal structures, electrical and magnetic properties of (BEDT-HBDST)2MX4 (M=Fe, Ga, X=Cl, Br), where BEDT-HBDST=2,5-bis(4,5-ethylenedithio-1,3-diselenol-2-ylidene)-2,3,4,5-tetrahydrothiophene
作者:Takashi Shirahata、Takehiko Mori、Kazuko Takahashi
DOI:10.1016/j.jssc.2003.08.030
日期:2004.1
molecules. The magnetic susceptibilities of the FeCl4− and FeBr4− salts follow the Curie–Weiss law with Curie constants of 4.6 and 4.8 emu K mol−1 (sum of the spins of S=5/2 and S=1/2) and negative Weiss temperatures of θ=−1.2 and −4.9 K, respectively, revealing a weak antiferromagnetic interaction of 3d spins of the FeCl4− and FeBr4− anions. The Fe⋯Fe (6.66–7.60 Å), Cl⋯Cl (4.81–4.82 Å) and Br⋯Br (4.74–4
新型共轭伸长的双(亚乙基二硫代)四硒富勒烯(BETS)型供体,2,5-双(4,5-亚乙基二硫代-1,3-二甲苯基-2-亚烷基)-2,3,4,5-四氢噻吩(BEDT) -HBDST)和它的磁和非磁性阴离子盐,(BEDT-HBDST)2 MX 4(MX 4 - =的FeCl 4 - ,的GaCl 4 -,FeBr 4 -和贾布尔4 - ),制备。这四种盐是同构的,属于P 2 / c的空间群。他们显示出具有小活化能(59–64 meV)的半导体行为。这些盐的能带结构是一维的,并且在上能带和下能带之间存在中间间隙,这是因为二聚化度在堆叠方向上是显着的。在MX 4 -离子位于供体列之间和靠近供体分子的亚乙基部分。所述的FeCl的磁化率4 -和FeBr 4 -的盐遵循居里-外斯定律4.6和4.8鸸鹋ķ摩尔居里常数-1(总和的自旋的小号= 5/2和小号= 1/2)和负魏斯温度θ= -1.2 -4.9和K