Reversible Phase Transition with Ultralarge Dielectric Relaxation Behaviors in Succinimide Lithium(I) Hybrids
Reversible Phase Transition with Ultralarge Dielectric Relaxation Behaviors in Succinimide Lithium(I) Hybrids
复制标题
琥珀酰亚胺锂 (I) 杂化物中具有超大介电弛豫行为的可逆相变
DOI：
10.1021/acs.inorgchem.7b02625
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发表时间：
2018
影响因子：
4.6
通讯作者：
Wen He Rui
中科院分区：
文献类型：
--
作者：
Tang Yun Zhi;Wang Bin;Zhou Hai Tao;Chen Shao Peng;Tan Yu Hui;Wang Chang Feng;Yang Chang Shan;Wen He Rui
介电弛豫已广泛应用于高介电常数电容器、介电开关、铁电体、热释电体和电绝缘材料。然而，对有机-无机杂化材料大介电弛豫行为的研究文献很少。本文提出了一种新的二维琥珀酰亚胺锂(I)杂化化合物[Li(PDD)2ClO4]n,1, （PDD = 2,5-吡咯烷二酮=琥珀酰亚胺），该化合物在228 K附近表现出可逆的相变行为，并伴有mi41 /amdto / c2 /c的反常对称性破缺。x射线单晶衍射分析表明，吡咯烷杂环的扭转运动和clo4阴离子的有序-无序运动触发了可逆相变。通过直观的晶体学模型（咔嗒离子模型），我们进一步说明了有趣的可逆相变的机理。特别是，由于介电常数对温度和频率的依赖以及Cole-Cole关系，1在相变附近表现出了超大的介电弛豫行为。
Dielectric relaxations have widely applied on high permittivity capacitors, dielectric switches, ferroelectrics, pyroelectrics, and electrical insulating materials. However, few investigations of large dielectric relaxation behaviors on organic–inorganic hybrid materials have been documented before. Here we present a novel two-dimensional succinimide lithium(I) hybrid compound, [Li(PDD)2ClO4]n,1, (PDD = 2,5-pyrrolidinedione = succinimide) which shows reversible phase transition behavior in the vicinity of 228 K accompanied by an unusual symmetry breaking fromI41/amdtoC2/c. X-ray single crystal diffractions analysis indicates the twist motion of pyrrolidine heterocycles, and order–disorder motion of ClO4–anions triggered the reversible phase transition. By means of an intuitive crystallographic model (rattling ion model), we further illustrated the mechanism of the interesting reversible phase transition. Particularly,1shows ultralarge dielectric relaxation behavior in the vicinity of the phase transition by its dielectric constant dependence on temperatures and frequencies as well as its Cole–Cole relation.