在单核铁 (III) 复合体中的协同旋转交叉和光
Zi-Xuan Fan1, Kai-Ting Lian1, Pei-Yu Liao1
1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Institute of Green Chemistry and Molecular Engineering, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou 510275, China. nizhp@mail.sysu.edu.cn.
概括
两种新的铁 (III) 复合物表明, counterions 影响磁性和光性质. 这项研究首次揭示了铁 (III) 复合体中旋转交叉和光之间的协同效应.
科学领域:
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
背景情况:
- 铁 (III) 复合物以其多样化的磁性和光学特性而闻名.
- 金属复合体中的旋转交叉 (SCO) 现象对分子开关和传感器具有兴趣.
- 金属复合体中的光可以通过它们的电子结构和环境来调节.
研究的目的:
- 合成和表征新的单核铁 (III) 复合物.
- 为了研究 counterions 对铁 (III) 复合物的磁性和光特性的影响.
- 探索这些系统中旋转交叉和光之间的潜在协同作用.
主要方法:
- 合成两种单核铁 (III) 复合物与2,2-二醇 (H2azp) 连接体.
- 使用诸如X射线衍射,磁敏度测量和光光谱等技术对复合物的表征.
- 对观察到的特性 (2-乙和2-乙) 的对比效应的分析.
主要成果:
- 成功合成了 (XEA) [Fe(azp) ]2·H2O复合体,其中XEA代表了不同的乙烯对应物.
- 证明了对子离子依赖的磁性行为,包括旋转交叉.
- 对光特性的观察,这些特性也受到对照器的调制.
- 首次观察到铁 (III) 复合体中的突然旋转交叉和光之间的协同效应.
结论:
- counterion 在调整铁 (III) 复合物的磁性和光性质方面发挥着至关重要的作用.
- 在旋转交叉和光之间观察到的协同效应为设计功能分子材料开辟了新的途径.
- 这些发现有助于理解协调化学中的结构属性关系.
更多相关视频
相关概念视频
Colors 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
Valence 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
NMR Spectroscopy: Spin–Spin Coupling
1.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.3K
Spin–Spin Coupling: One-Bond Coupling
949
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,...
949
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
977
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
977
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K


