洞察CuII-LnIII二次体中的铁磁相互作用与一个隔间联体
Anangamohan Panja1,2, Sagar Paul3, Eufemio Moreno-Pineda4,5
1Department of Chemistry, Gokhale Memorial Girls' College, 1/1 Harish Mukherjee Road, Kolkata-700020, India. ampanja@yahoo.co.in.
Dalton transactions (Cambridge, England : 2003)
|January 11, 2024
概括
这项研究探讨了在低温下铜 (CuII) 和 (LnIII) 离子之间的磁相互作用. 在一些综合体中观察到意想不到的反铁磁合,挑战了之前的观察.
科学领域:
- 协调化学 协调化学
- 磁电化学 磁电化学 磁电化学
- 量子化学 是一个量子化学.
背景情况:
- 研究Cu (II) 和Ln (III) 离子之间的磁相互作用对于开发分子磁性至关重要.
- 以前的研究经常报告Cu (II) -Ln (III) 系统中的铁磁合,特别是4f7金属离子.
- 在低于凯尔文温度下对这些相互作用的探索,特别是对异性质Ln(III) 离子的探索,仍然是有限的.
研究的目的:
- 为了合成和表征新的异金属复合体Cu (II) - Ln (III).
- 通过实验和理论方法研究Cu (II) 和各种Ln (III) 离子 (Gd,Tb,Dy,Er) 之间的磁性合.
- 探索低于凯尔文温度的磁性行为,并了解潜在的相互作用机制.
主要方法:
- 合成异金属复合物使用一个隔间的希夫基联结体.
- 用于结构确定的X射线晶体学.
- 磁感应度测量和微超导量子干扰装置 (μ-SQUID) 在低于凯尔文温度的研究.
- 完成活动空间自相一致场 (CASSCF) 和破碎对称密度函数理论 (BS-DFT) 的计算.
主要成果:
- 合成了四种同结构和同形异金属复合物 [CuLn(HL) ((μ-piv) ((piv) 2] .
- 观察到Cu (II) 和Ln (III) 之间的铁磁合,与之前的发现一致.
- μ-SQUID研究显示,在低于凯尔文温度的Gd,Tb和Dy复合体中出现了意想不到的反铁磁合,这归因于短的CuCu距离.
- 对 1-3 个复合体观察到快速放松动态,而 4 个复合体显示出潜在的分子间排序.
结论:
- 该研究揭示了Cu (II) -Ln (III) 系统中复杂的磁性行为,包括在低温下意想不到的反铁磁相互作用.
- 短的金属对金属距离在确定磁性合的性质方面发挥着重要作用.
- 这些发现有助于更深入地了解分子材料中的磁相互作用,并指导未来磁系统的设计.
更多相关视频
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
9.2K
16:11Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
2.3K
相关概念视频
03:02Colors and Magnetism
11.7K
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...
11.7K
02:42Valence Bond Theory
8.6K
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...
8.6K
02:58Crystal Field Theory - Octahedral Complexes
26.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.5K
02:51Metal-Ligand Bonds
20.8K
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...
20.8K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.6K