Novel Conductive Radical Cation Salts Based on Methylenediselenotetraselenafulvalene (MDSe-TSF): A Sign of Superconductivity in -(MDSe-TSF)2Br Below 4 K
作者:Mie Kodani、Ayumi Takamori、Kazuo Takimiya、Yoshio Aso、Tetsuo Otsubo
DOI:10.1006/jssc.2002.9755
日期:2002.11
Seven conductive radical cation salts based on MDSe-TSF (methylenediselenotetraselenafulvalene) have been synthesized by electrocrystallization in the presence of Cl−, Br−, I3−, I2Br−, PF6−, ClO4−, and Cu(NCS)2− counter anions. The crystal appearances of these salts fairly depend on the anions employed. X-ray crystallographic analyses have revealed that the PF6 and ClO4 salts in the shape of brown
基于MDSE-TSF(methylenediselenotetraselenafulvalene)七克导电自由基阳离子盐已经通过电结晶在氯的存在下合成- ,溴- ,我3 - ,我2溴-,PF 6 -,CLO 4 -和Cu(NCS)2 -抗衡阴离子。这些盐的晶体外观完全取决于所用的阴离子。X射线晶体学分析表明,呈棕色薄板状的PF 6和ClO 4盐采用θ型,其特征在于施主堆的人字形排列的结构,而在黑色厚板形状的Cl和Br的盐有利于κ与供体二聚体的正交排列型结构。不管不同的晶体外观或晶体堆积模式,所有这些盐显示出高的导电性(> 10 2小号厘米-1在室温下)和保留金属性质下降到4.2 K.它们中,将BR盐示出了弱但不同的抗磁屏蔽在零场冷却(ZFC)条件下的直流磁化测量中,低于4 K的信号,表明存在超导性。两个PF的带计算6 溴盐和溴盐显示出闭合的费米表面,表明二维分子导体。