调整[Fe2]金属有机的旋转交叉特性
Laia Navarro1, Arnau Garcia-Duran1, Jordi Cirera1
1Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain. jordi.cirera@qi.ub.es.
Dalton transactions (Cambridge, England : 2003)
|July 31, 2024
概括
在金属有机 (MOCs) 中,体功能化和客体大小影响过渡温度. 更小的客人增强了两步过渡,有助于设计特定的温度传感器.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 超分子化学 超分子化学
背景情况:
- 金属有机 (MOCs) 对传感等应用具有前景.
- 控制旋转交叉 (SCO) 材料的过渡温度 (T1/2) 对设备应用至关重要.
- 了解MOC中的客体-连接体相互作用是调整其属性的关键.
研究的目的:
- 通过计算来研究连接体功能化和封装客体如何影响特定铁基MOCs的某一家族的过渡温度 (T1/2).
- 探索客人的体型,客人的位置和SCO行为之间的关系.
- 为温度传感应用的MOC合理设计提供见解.
主要方法:
- 用密度函数理论 (DFT) 的计算来研究MOCs的电子结构.
- 用d基分子轨道的分析来理解观察到的趋势.
- 进行了对联体替代物 (R组) 和客体离子 (X) 的系统变化.
主要成果:
- 带有电子捐赠或提取组的连接体功能化显著影响过渡温度 (T1/2).
- 在T1/2的减少和客人尺寸的增加之间观察到线性相关性.
- 发现较小的客人从腔中心转移,增强了两步SCO过渡特征.
结论:
- 这项研究表明,连接体设计和客分子对MOCs的旋转交叉特性都有显著的影响.
- 电子结构的计算分析提供了对这些效应的基本理解.
- 这些发现有助于合理设计针对性温度传感和SCO设备开发的新型MOC.
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
02:58Crystal Field Theory - Octahedral Complexes
26.3K
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...
26.3K
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
02:51Metal-Ligand Bonds
20.7K
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...
20.7K
01:17Spin–Spin Coupling: One-Bond Coupling
952
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
952
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.9K
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,...
41.9K