三角形平面异体质兰他尼德 (Lanthanide) (III) 双 (Bis) 胺复合物,含有氨基基和阳离子
Gemma K Gransbury1, Hannah M Nicholas1, Siobhan R Murphy1
1Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Inorganic chemistry
|November 12, 2024
概括
用TEMPO激素调节兰化物复合物的晶场,可以了解光学和磁性特性. 研究人员合成了新的复合物,并发现复合物中没有单分子磁铁行为,尽管有希望的电子结构.
科学领域:
- 协调化学 协调化学
- 兰化物复合物 兰化物复合物
- 磁力学 磁力学 是一种
背景情况:
- 晶体场 (CF) 调制在兰化物 (Ln) 复合体中对于增强光学和磁性特征至关重要.
- 低协调数和特定的几何形状可以导致大量的CF分裂.
- 之前的工作证明了近线性Sm(II) 复合物的氧化到三角平面Sm(III) 复合物的氧化,使用TEMPO基.
研究的目的:
- 为了合成含有TEMPO离子和TEMPO基的同类异构性兰坦化物复合物.
- 为了比较这两个复合体家族的电子结构.
- 为了研究单分子磁铁行为在这些兰坦化物复合体中的潜力.
主要方法:
- 合成新的兰化物复合物:[LnIII{N(Si iPr3) 2}2(TEMPO-) ] (2-Ln) 和[LnIII{N(Si iPr3) 2}2(TEMPO•) ][B(C6F5) 4] (4-Ln).
- 光谱分析:UV对NIR和电子磁共振 (EPR) 光谱学.
- 磁性测量和初始计算.
主要成果:
- 成功合成了含有TEMPO-离子的2 - Ln (Ln = Tm, Yb) 和含有TEMPO•激素的4 - Ln (Ln = Sm, Tm, Yb) 的异体质复合体.
- 电子结构比较揭示了CF分裂和基态稳定方面的见解.
- 对于2-Yb复合体,没有观察到单分子磁铁行为,即使有显著的CF分裂和纯的mJ状态.
结论:
- 在这些几何相似的兰坦化物复合体中存在的TEMPO- anion或TEMPO• 基并没有在研究的Yb复合体中诱导单分子磁铁行为.
- 需要进一步的研究,以了解单分子磁铁特性在兰化物系统中控制的因素.
- 合成途径为进一步研究提供了对新型异体质兰化物复合物的获取.
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