在室温附近,在混合价值分子方形中逐步旋转状态切换和光磁效应
Sujit Kamilya1, Sakshi Mehta1, Rodrigue Lescouëzec2
1Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C. V. Raman Road, Bangalore-560012, India. mondal@iisc.ac.in.
一个新的分子正方形复合体显示了由热引起的两步旋转状态切换. 这种旋转过渡行为,在{[Fe(pzTp) ((CN) 3}2[Fe(L) 2}2}[Fe(pzTp) ((CN) 3}2·4CH3OH·2H2O中观察到,是可逆的,也可以通过光来诱导.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 磁电化学 磁电化学 磁电化学
背景情况:
- 分子自旋交叉 (SCO) 复合体对开发可切换分子材料具有兴趣.
- 化物桥梁铁 ((II) 协调聚合物提供可调节的SCO特性.
- 了解旋转状态切换机制对于设计功能性SCO材料至关重要.
研究的目的:
- 为了合成和描述一种新的化物桥梁 [Fe2Fe2] 分子方形复合体.
- 调查该复合体的热和光诱导的自旋状态切换行为.
- 探索溶解对旋转过渡性质的影响.
主要方法:
- 单晶X射线衍射用于结构确定.
- 可变温度磁感应度的测量.
- 光谱技术和光照辐射实验.
主要成果:
- 复杂的{[Fe{pzTp) {CN) ]2[Fe{L) ]2}[Fe{pzTp) {CN) ]2·4CH3OH·2H2O表现出一个两步热诱导的旋转转变,过渡温度 (T1/2) 为306 K和370 K.
- 在加热过程中观察到一个稳定的中间旋转阶段.
- 解复合体显示较低的T1/2为190K,表明旋转过渡温度的显著变化. 摄影诱导的自旋状态切换在20K时被观察到,T_LIESST为60K.
结论:
- 合成的分子方形复合体表现出复杂的自旋状态切换行为.
- 溶解在调节旋转过渡温度方面发挥着至关重要的作用.
- 该材料表现出热和光诱导的旋转转变,突出显示其用于可切换分子装置的潜力.
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