...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Structural and Physical Properties of a Series of 7,7,8,8-Tetracyanoquinodimethane Salts with Dications Bearing Two Terminal Pyridinium Rings
【24h】

Structural and Physical Properties of a Series of 7,7,8,8-Tetracyanoquinodimethane Salts with Dications Bearing Two Terminal Pyridinium Rings

机译：带有两个带有两个末端吡啶环的阳离子的一系列7,7,8,8-四氯噻吩甲烷甲烷盐的结构和物理性质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A series of radical anion salts composed of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and dications with -C_nH_(2n)- (n = 1?6) chains between two pyridinium rings are synthesized. The dication and TCNQ formed either 1:4 or 1:3 stoichiometries with no correlation between the composition and n. The 1:4 stoichiometry salts were obtained when n = 1, 3, 4, 5, 6, where TCNQ formed a one-dimensional column with either dimerization or tetramerization. In these salts, the individual dication length varied considerably, but the effective dication length (the distance between two adjacent dications in the lattice) was independent of n. For n = 1, solvent molecules were involved. However, the 1:4 stoichiometry could not be formed for n = 2 since an appropriate effective dication length could not be attained. The 1:3 stoichiometry salts were obtained when n = 2 and 6. In both crystals, TCNQ assembled into a trimer. For both stoichiometries, the crystals were moderately conducting (resistivity at room temperature: 101?104 Ω cm) and had a semiconducting temperature dependence, demonstrating nonuniform TCNQ stacking. The charge-localized feature was revealed by the magnetic properties. All of the salts showed antiferromagnetic interactions between the localized spins with varying exchange interaction parameters, reflecting the structural features.
机译：合成了一系列由7、7、8、8-四氰基喹二甲烷（TCNQ）组成的自由基阴离子盐，以及在两个吡啶鎓环之间具有-C_nH_（2n）-（n = 1？6）链的二价阳离子。指示和TCNQ形成1：4或1：3的化学计量比，组成和n之间没有相关性。当n = 1、3、4、5、6时，可得到1：4的化学计量盐，其中TCNQ通过二聚或四聚形成了一个一维柱。在这些盐中，单个指示长度变化很大，但是有效指示长度（晶格中两个相邻指示之间的距离）与n无关。对于n = 1，涉及溶剂分子。但是，由于n = 2，无法形成1：4的化学计量比，因为无法获得适当的有效指示长度。当n = 2和6时，获得了化学计量比为1：3的盐。在两个晶体中，TCNQ组装成三聚体。对于两种化学计量，晶体均具有适度的导电性（室温下的电阻率：101-104Ωcm），并且具有半导体温度依赖性，表明TCNQ堆叠不均匀。磁性特性揭示了电荷局部化特征。所有的盐在局部自旋之间都表现出反铁磁相互作用，具有不同的交换相互作用参数，反映了结构特征。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号