铁 (V) 化物的合成,结构和活性
Jeremiah J Scepaniak1, Carola S Vogel, Marat M Khusniyarov
1Department of Chemistry and Biochemistry, MSC 3C, New Mexico State University, Las Cruces, NM 88003, USA.
Science (New York, N.Y.)
|February 26, 2011
概括
研究人员成功合成并描述了一种新的铁化物复合物. 这一突破为高价值铁物种的反应性提供了洞察力,导致氨形成.
科学领域:
- 无机化学 无机化学 有机化学
- 有机金属化学 有机金属化学
- 协调化学 协调化学
背景情况:
- 铁 (V) 化合物是化学反应中的关键中间体,但很难分离和研究.
- 了解高价值铁的化学成分对于催化和生物过程至关重要.
研究的目的:
- 准备和表征一个稳定的铁 (V) 化物复合物.
- 为了研究合成铁的电子结构和反应性.复合体.
主要方法:
- 通过铁前体的单电子氧化合成铁化复合物.
- 单晶X射线衍射用于结构确定.
- 梅斯尔和电子偏磁共振光谱学用于电子表征.
- 计算式电子结构计算.
主要成果:
- 成功制备和分离铁的化物复合物, [PhB (t) BuIm (t) Fe (v) N]BAr (f24).
- X射线衍射证实了四坐标铁 (V) 中心与终端化连接体.
- 光谱和计算数据显示了低旋转的d(3) 铁(V) 配置 (S = 1/2).
- 铁 (V) 复合物在降解条件下与水反应,产生氨和一种铁 (II) 物种.
结论:
- 该研究报告了第一个稳定的铁化物复合物,为研究高价值铁化学提供了新的平台.
- 描述的铁 (V) 复合体表现出与转化相关的反应性,例如氨合成.
- 这项工作促进了对高氧化状态下铁的物种化和反应性的基本理解.
相关概念视频
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
02:42Valence Bond Theory
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...
02:52Resonance
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
02:16Resonance and Hybrid Structures
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
01:261° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...