异金属兰化物单碳化合物复合物的掩盖双重反应性
Arpan Mondal1, Jinkui Tang2, Richard A Layfield1
1Department of Chemistry, School of Life Sciences, University of Sussex, BN1 9RH, Brighton, U.K.
Angewandte Chemie (International ed. in English)
|October 30, 2024
概括
一个新奇的稀土减少系统利用掩盖的双价性和,使得独特的金属复合物的合成. 这些化合物表现出有趣的磁性,其中一种作为单分子磁体.
科学领域:
- 有机金属化学 有机金属化学
- 稀土化学 稀土化学
- 材料科学 材料科学 材料科学
背景情况:
- 三价稀土元素 (REEs) 由于其稳定的氧化状态,通常具有有限的反应性.
- 开发新的合成方法,以获得REEs中不寻常的氧化状态,对于扩大其化学应用至关重要.
- 了解REE复合物的磁性特性是设计先进分子材料的关键.
研究的目的:
- 引入一种新的和的还原系统,模仿双价反应.
- 为了合成和表征新的稀土复合物与N-异环连接体.
- 研究合成的双化合物的动态磁性特性,特别是它们的单分子磁体 (SMM) 行为.
主要方法:
- 合成含有异碳基桥梁的二聚体[{Cp'M) }{μ-Fp) ]2 (M=Y,Dy) 含有掩盖的双价稀土中心.
- 通过使用新型稀土系统减少N-异环 (2,2'-二二,,六三乙烯).
- 结果的金属复合物的表征和使用SQUID磁力测量等技术的磁性特性调查.
主要成果:
- 建立了一个新的稀土减少系统,使三价Y和Dy能够像二价一样反应.
- 单,二,三金属稀土复合物通过将N-异环环减小到不同程度来合成.
- 双化合物1Dy表现出具有显著能量屏障 (449 cm-1) 的单分子磁铁行为,而相关的复合物3Dy和4Dy由于特定的结构和电子因素而没有显示SMM特性.
结论:
- 开发的异碳基桥接二聚体系统有效地为伊和失提供了掩盖的双价反应性.
- 该系统允许控制减少N-异环,从而产生具有可调节电子结构的新型稀土复合物.
- 这项研究突出了结晶场,联结体相互作用和硬质效应的复杂相互作用,以确定基于的单分子磁铁的磁性行为.
相关概念视频
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
01:19Complexation Equilibria: The Chelate Effect
468
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
468
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
02:34Structural Isomerism
19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.1K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
345
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
345
02:51Metal-Ligand Bonds
20.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.6K