寻找具有单牙O-捐赠体连接体的同质单核复合体
Alberto Pérez-Bitrián1,2, Julen Munárriz3, Konstantin B Krause2
1Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin Fabeckstraße 34/36 Berlin 14195 Germany alberto.perez-bitrian@hu-berlin.de s.riedel@fu-berlin.de.
Chemical science
|April 19, 2024
概括
研究人员使用五合金正酸联体合成了所有O-捐赠体联体的新型复合体. 这些独特的单核复合物表现出独特的电子特性和几何形状,为化学提供了新的见解.
科学领域:
- 无机化学 无机化学
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
背景情况:
- -氧键在生物和催化系统中至关重要.
- 单核复合物,只有O-捐赠体是稀有的.
- 五甲基酸盐 (OTeF5) 配体的低桥接倾向有助于合成独特的复合物.
研究的目的:
- 合成和表征具有全O-捐赠者协调球体的新型同质复合体.
- 为了研究这些独特的复合体中的电子结构,几何学和结合.
- 为了比较复合物中五甲和化物联体的特性.
主要方法:
- 使用五合金正和酸连接物合成同质性复合物.
- 实验性表征包括磁感应度测量和EPR光谱学.
- 使用密度函数理论 (DFT) 和CASSCF/NEVPT2方法进行理论计算.
- 分子间量子原子 (IQA) 方法用于结合分析.
主要成果:
- 两种同质性复合物[Mn(OTeF5)4]2-和[Mn(OTeF5)5]2-已成功合成.
- 二复合体呈现出高旋转的d5配置,具有四面体扭曲.
- (III) 复合体显示了一个高旋转的d4配置,具有稳定的方形金字塔几何.
- 酸连接体的电子特性与化物相当,稳定了这些独特的物种.
结论:
- 这些复合物的成功合成扩大了的已知的协调化学.
- 铁酸连接体有效地与O-捐赠体连接体产生单核复合体.
- 铁酸盐和化物连接体之间的电子相似性有助于稳定这些独特的物种.
相关概念视频
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
01:19Complexation Equilibria: The Chelate Effect
513
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
513
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
00:43Complexometric Titration: Ligands
948
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
948
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
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.0K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.0K