基于鲁 (III) 和2,2'-双双的等离子复合物:X射线结构和磁性特性
Marta Orts-Arroyo1, Joel Monfort1, Nicolás Moliner1
1Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/Catedrático José Beltrán 2, Paterna, 46980 València, Spain.
Molecules (Basel, Switzerland)
|October 28, 2023
概括
合成了两种新型的 (III) 化合物,其中含有 2,2'-二胺醇配体. 复合物2显示了由于pi-pi堆叠而导致的反铁磁合,与孤立复合物1不同.
科学领域:
- 协调化学 协调化学
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
背景情况:
- (III) 复合物因其多样化的电子和磁性特性而引起人们的兴趣.
- 2,2 - - 双米达配体提供了多功能协调模式和分子间相互作用的潜力.
- 了解金属复合体中的结构性质关系对于设计新材料至关重要.
研究的目的:
- 为了合成和表征两种新 (Ruthenium) 化合物,利用2,2-二胺醇配体.
- 研究晶体包装和分子间相互作用对这些Ru (III) 复合物的磁性行为的影响.
- 为了比较单核Ru(III) 复合体与相关的二维或聚合系统的磁性特性.
主要方法:
- 两种不同的Ru (III) 复合物的合成和完整表征:cis-[RuCl2 (H2biim) ]Cl·4H2O (1) 和一种racemic混合物{cis-[RuCl2 (H2biim) ]Cl}2·4H2O (2).
- 单晶X射线衍射分析以确定晶体结构和空间组 (C2为1,P21为2).
- 在多晶样品上测量可变温度直流 (dc) 磁感应度,以探测磁相互作用.
主要成果:
- 这两种化合物都在单临床系统中结晶,不同的空间组表明不同的包装安排.
- 复合体2在意达环之间表现出显著的pi-pi堆叠相互作用,与复合体1相比,导致较短的分子间Ru-Ru距离.
- 复合体1表现为磁性隔离的S=1/2单核Ru(III) 复合体,而复合体2表现为抗铁磁合 (S=0) 的,其最大灵敏度为3.0K.
结论:
- 晶体包装显著影响Ru(III) 复合物的磁性特性,其中含有2,2-二胺醇连接体.
- 复合体2中pi-pi堆叠的存在有助于分子间磁性合,导致反铁磁性行为.
- 这些发现突出了固态结构在决定协调化合物的磁反应方面的重要性.
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