在二维霍夫曼协调聚合物中,温度诱导的旋转过渡和压力诱导的旋转过渡的异常压力反应
Ruixin Li1, Georgiy Levchenko2,3, Carlos Bartual-Murgui4
1State Key Laboratory of Superhard Materials, Jilin University, Changchun130012, China.
旋转过渡化合物在其温度诱导的旋转过渡 (TIST) 中表现出不寻常的压力反应. 压力诱导的旋转转变 (PIST) 是可逆的,其属性受压力转移介质的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 协调化学 协调化学
背景情况:
- 旋转过渡 (ST) 化合物在ST期间显示性能变化,温度诱导的旋转过渡 (TIST) 是主要研究重点.
- 了解压力对ST的影响对于材料应用至关重要.
研究的目的:
- 研究TIST的压力反应和压力诱导的旋转转变 (PIST) 在2D霍夫曼型ST化合物[Fe ((Isoq) 2M ((CN) 4) ] (Isoq-M) 中.
- 分析分子间相互作用和协调环境扭曲对压力下的ST行为的影响.
主要方法:
- 使用Isoq-Pt和Isoq-Pd化合物的压力依赖性研究.
- 检查了过渡温度 (T1/2) 和非单调歇斯底里宽度 (ΔT1/2) 的非线性压力依赖性.
- 在室温下研究可逆PIST和压力转移介质 (PTM) 的作用.
主要成果:
- 在TIST中观察到Isoq-Pt和Isoq-Pd的异常压力反应,具有非线性T1/2和非单调的ΔT1/2.2.
- 压力下的八面体扭曲是2D霍夫曼型ST化合物中潜在的常见行为.
- 在室温下观察到可逆PIST;由于更大的机械性质变化,Isoq-Pt显示出比Isoq-Pd更突然的ST.
- 通过影响自旋域形成,PTM的水静电特性显著影响PIST.
结论:
- 分子间相互作用和八面体扭曲的协同效应导致TIST中的异常压力反应.
- 可实现可逆PIST,其特征可以通过PTM选择进行调.
- 这些发现为设计具有量身定制压力反应的ST材料提供了洞察力.
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