单核Fe (III) 复合物与2,4-二-6-----------------:合成,结构和磁性行为
Ah Rim Jeong1, Si Ra Park2, Jong Won Shin1
1Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea. jwshin@kisti.re.kr.
Dalton transactions (Cambridge, England : 2003)
|March 28, 2024
概括
合成和研究了三种新的铁 (III) 协调复合物. 它们的自旋交叉特性在固态和溶液状态之间有显著的变化,受到 counterions 的影响.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
背景情况:
- 基于铁的协调复合物是有趣的,因为它们的磁性属性.
- 金属复合体中的旋转交叉 (SCO) 现象为分子开关和传感器提供了潜力.
- 了解连接体和对子体对SCO行为的影响对于设计新材料至关重要.
研究的目的:
- 合成和表征具有特定连接体的新型Fe (III) 协调复合体.
- 为了研究这些复合体在固体和溶液状态中的旋转交叉特性.
- 为了探索不同的 counterions (酸盐,四玻酸盐,酸盐) 对SCO行为和放松动态的影响.
主要方法:
- 三个Fe (III) 协调复合物的合成:[Fe (dqmp) 2[Fe (dqmp) 2]3) ·H2O (1),[Fe (dqmp) 2]
- 使用单晶X射线晶体学进行结构性表征.
- 在固体和溶液状态下进行磁性特性研究,包括温度依赖性研究和放松时间测量 (T1,T2).
主要成果:
- 所有合成的复合体都表现出具有两个三角形dqmp-连接物协调到Fe (III) 的线结构.
- 综合体1显示在固态状态下225 K的突然,完整的旋转交叉,而综合体2和3显示不完整的SCO分别在135 K和150 K.
- 在溶液中,SCO行为是对子依赖的;复合体1显示不完整的SCO,而复合体2和3显示的过渡比固态更完整. 放松时间T1和T2随温度的增加而增加.
结论:
- 在Fe(III) 复合体中,特别是在溶液中, counterion 在调节旋转交叉行为方面发挥着关键作用.
- 与固态相比,复合体2和3在溶液中显示了增强的旋转过渡完整性.
- 研究的复合体表现出明显的磁放松动态,受温度和 counterion 标识的影响.
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