在含有4,4'-双氨酸的1D有机金属兰化物链化合物中的磁性歇斯底里
Ernesto Castellanos1, Florian Benner1, Saroshan Deshapriya1
1Department of Chemistry, Michigan State University 578 South Shaw Lane East Lansing Michigan 48824 USA sdemir@chemistry.msu.edu.
Chemical science
|October 1, 2025
概括
研究人员使用4,4-双二连接体合成了新型的甲链化合物. 双化合物表现出单分子磁体行为,由单离子异性驱动.
科学领域:
- 有机金属化学 有机金属化学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- 开发先进的功能性材料需要组装多核复合体与异型构建块.
- 在复杂的系统中将以兰他尼德为基础的金属部分纳入复杂的系统是合成上具有挑战性的,并且很少有针对性的隔离.
研究的目的:
- 为了合成和表征新的1D有机金属胺链化合物.
- 为了研究这些胺链化合物的磁性特性,特别关注单分子磁性.
主要方法:
- 使用4,4'-双二连接物和H管方法结晶的甲化合物的合成.
- 使用X射线晶体学,直流磁性易感性,CW-EPR光谱学和DFT计算进行了表征.
- 评估单分子磁铁 (SMM) 通过交流磁性易感性和变场直流测量.
主要成果:
- 第一个以晶体学特征的1D有机金属网络,由有机桥梁连接的化金属单位组成.
- [Cp*2Ln]+ (Ln = Gd,Tb,Dy) 的合成的齐克扎克状链,由4,4'-双二连接在一起.
- 鉴定出dysprosium模拟物 (3) 是一种单分子磁体 (SMM),具有缓慢的磁放松和高达8K的歇斯底里循环.
结论:
- 合成的化合物代表了一种新型的1D有机金属兰化物网络.
- 双类型的SMM行为源于单离子异性离子和晶体场效应,磁交换最小.
- 这项工作为设计具有量身定制磁性特性的新型兰他尼德基功能材料开辟了道路.
更多相关视频
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.6K
07:24Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
18.4K
相关概念视频
03:02Colors and Magnetism
14.0K
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...
14.0K
02:42Valence Bond Theory
11.2K
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...
11.2K
01:31Ferromagnetism
3.0K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.0K
01:27π Electron Effects on Chemical Shift: Overview
1.6K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.6K
02:51Metal-Ligand Bonds
24.0K
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...
24.0K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
1.8K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.8K