在分子固体中通过-键强度的互补性进行相变控制
Shan-Nan Du1, Wei Deng1, Jia-Chuan Liu1
1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, IGCME, GBRCE for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou, 510006, P. R. China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|May 27, 2024
概括
研究人员使用键强度来化学调节分子固体相位过渡. 这种方法可以控制可切换磁力和分子动力学,为功能性材料提供了新的设计策略.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 超分子化学 超分子化学
背景情况:
- 分子固体中的相位过渡对于不同的性质至关重要,但在化学上很难控制.
- 债券 (H-债券) 在这些转变中发挥着关键作用,但它们的动态和结构-属性关系尚未得到充分理解.
- 现有的调节分子固体相变的方法是有限的.
研究的目的:
- 用于化学调节分子固体中相变的动态.
- 为了阐明H-bond驱动的相位过渡中的结构-属性关系.
- 为具有可切换性质的分子固体开发一种新的设计策略.
主要方法:
- 合成和系统地研究四种高旋转的 (Cobalt) 化合物,它们具有修饰的连接体末端组 (X=S,Se) 和替代物 (Y=Cl,Br).
- 分析室温附近的结构相位过渡,包括客分子旋转和连接体构造变化.
- 对H键的几何分析和初始计算,以确定替代物电子负性的对H键强度和相位过渡行为的影响.
主要成果:
- 两个化合物 (S-Cl和Se-Br) 呈现出接近室温的可逆结构相变,加上可切换的磁性.
- 其他两种化合物 (S-Br和Se-Cl) 在各自相位中保持稳定.
- 受X和Y的电子阴性影响的H键强度被确定为控制驱动相变的关键因素.
结论:
- 通过互补性 (强受体与弱供体,反之亦然) 实现适当的H键强度,对于驱动的结构阶段过渡至关重要.
- 这项研究展示了一种简单有效的化学方法,用于设计具有可调节相位过渡特性的分子固体.
- 这些发现为通过H键工程控制分子动力学和磁性提供了新的视角.
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