在bisbenzimidazole基因桥接的dilanthanide复合体中,磁性歇斯底里和很大的强制性
Florian Benner1, Léo La Droitte2, Olivier Cador2
1Department of Chemistry, Michigan State University 578 South Shaw Lane East Lansing Michigan 48824 USA sdemir@chemistry.msu.edu.
Chemical science
|June 2, 2023
概括
研究人员为先进技术开发了新的金属基复合物. 这些基于bisbenzimidazole的dilanthanide化合物表现出强烈的磁性合,为新型磁性材料和单分子磁铁铺平了道路.
科学领域:
- 协调化学 协调化学
- 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:
- 超磁性金属离子和激素连接体对于强大的磁交换合至关重要.
- 兰化离子对于未来的技术很重要,但需要有效的磁性通信.
- 激素供体原子的高旋转密度对于强的合是必不可少的,但这种分子很少见,而且具有反应性.
研究的目的:
- 为了合成和描述前所未有的基于比斯本齐米达的迪兰化物复合物.
- 为了研究兰坦化离子和激素连接体之间的磁交换合.
- 探索这些复杂物作为单分子磁铁的潜力.
主要方法:
- 合成了两个系列的迪兰化物复合物:[(Cp*2Ln) 2(μ-Bbim) ]和[K(crypt-222) ][(Cp*2Ln) 2(μ-Bbim ̇) ].
- 对磁感应度的测量以确定磁交换常数.
- 初步计算以了解合强度.
- 电化学研究探测氧化还原活性.
主要成果:
- 成功合成了Bbim基因连接体,并与兰坦化离子 (Gd,Tb,Dy) 进行了协调.
- 复杂的2-Gd表现出强大的反铁磁合 (J = -1.96(2) cm-1),而复杂的1-Gd显示出可以忽略不计的合.
- 最初的计算证实了2-Tb (-4.8 cm-1) 和2-Dy (-1.8 cm-1) 的合强度.
- 复杂的2-Dy显示出显著的单分子磁铁行为,阻塞温度为5.5K,强制场为0.54T.
结论:
- 这项研究提出了新型的迪兰化物复合物,其中包括一种罕见的双齐米达基连接体.
- 强大的磁性合在含有激素的复合物中得到了实现,增强了它们在磁性应用中的潜力.
- 复杂的2-Dy代表了一种高效的双核单分子磁铁,突出显示了金属基方法的前景.
更多相关视频
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.7K
09:38Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
Published on: January 3, 2018
7.2K
相关概念视频
03:02Colors and Magnetism
12.0K
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...
12.0K
02:42Valence Bond Theory
8.9K
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...
8.9K
01:31Ferromagnetism
2.4K
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...
2.4K
01:27π Electron Effects on Chemical Shift: Overview
1.1K
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,...
1.1K
01:26Diamagnetism
2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K
01:30Paramagnetism
2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K