| 一种电荷转移晶体的磁和介电弛豫性质 |
| Magnetic and Relax-like Dielectric Response Behavior in a Charge-Transfer Crystal |
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| 摘要: 在外加电场下,利用分子的旋转和取向运动是组装分子介电马达以及弛豫型分子介电体的一个主要策略。在本论文中,我们制备并表征了一个新的电荷转移晶体[C10-DMPy][Ni(mnt)2](1)(C10-DMPy+=1-decanel-N, N-dimethylpyridinium, mnt2-=马来二氰基二硫烯)。在一定的频率范围内,该化合物展现了介电弛豫行为,我们将此归于平衡阳离子的动力学位置取向和阴、阳离子间的电荷转移。该化合物的介电弛豫过程遵循Cole-Cole方程,偏离理想的Debye模型。单晶X-射线衍射表明该化合物的阴、阳离子分别独立堆积成柱状,柔性的有机阳离子与刚性的磁性阴离子构筑块间存在电荷协助氢键作用。此外,该化合物的磁行为展现为弱的铁磁耦合作用。 |
| 关键词: 电荷转移晶体 晶体结构 介电响应 磁性质 |
| 基金项目: 国家自然科学基金(No.21201103,21301093)资助项目。 |
| Abstract: Molecular rotation and orientation by applied electric field is one of the promising strategies for assembling the potential molecular dielectric rotors and relax-like dielectric. Here, a new charge transfer compound [C10-DMPy][Ni(mnt)2] (1) (C10-DMPy+=1-decanel-N, N-dimethylpyridinium cation, mnt2-=maleonitriledithiolate), which shows interesting dielectric relaxation process, is synthesized and characterized. The anions and cations of 1 are aligned into segregated stacks. There existed weakly charge-assisted hydrogen bonding interactions between the mobile organic cation and rigid [Ni(mnt)2]- anion. Large temperature-dependent dielectric constant values and dielectric relaxation process of 1 can be ascribed to the dynamic orientation motion of alkyl chain of the organic cation and charge transfer between anions and cations. The overall magnetic behavior of 1 corresponds to a paramagnetic system with ferromagnetic coupling interaction. |
| Keywords: charge-transfer crystal crystal structure dielectric response magnetic properties |
| 投稿时间：2015-07-27 修订日期：2015-10-16 |
| 摘要点击次数: 1671 |
| 全文下载次数: 1520 |
| 张雪梅,于姗姗,张辉,段海宝.一种电荷转移晶体的磁和介电弛豫性质[J].无机化学学报,2016,32(1):25-33. |
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