硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄の二酸化窒素複合体は,硫黄結合鉄
Ayumi Takaoka1, Neal P Mankad, Jonas C Peters
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|May 18, 2011
まとめ
研究者らは,亜酸化窒素と硫黄のリガンドを併用した新しい鉄複合体を開発した. これらのユニークな化合物は,窒素固定と硫黄の調整化学を研究するための貴重なモデルとして機能します.
科学分野:
- 無機化学 無機化学とは
- 有機金属化学 有機金属化学
- 協調化化学について
背景:
- トリス ((phosphino) シリルリガンドは,協調化学でよく研究されています.
- 硫黄ドナーを補助リガンドに組み込むことは,新興分野です.
- 窒素固定のためのモデル複合体の開発は,触媒研究にとって極めて重要です.
研究 の 目的:
- 鉄二酸化窒素複合体の新種を合成し,特徴づけること.
- 硫黄ドナーをフォスフィン基リガンドに組み込む効果を調査する.
- 二酸化窒素と硫黄を含む単核および二核鉄複合体の利用可能性を調査する.
主な方法:
- 改変されたトリス (((フォスフィノ)) シリルリガンドを用いた新しい鉄複合体の合成.
- 発生した複合体の特徴は,スペクトロスコピーおよび分析技術を用いて決定する.
- 鍵となる複合体の固体構造を決定するためのX線結晶学.
主要な成果:
- 補助リガンドの硫黄ドナーを含む鉄二酸化窒素複合体の成功合成.
- ティエーテルで置き換えられたフォスフィンアームの数を変化させることで,複合体の形成に影響を及ぼすことを実証.
- 二酸化窒素リガンドを含む単核および二核の鉄複合体の分離.
- 硫黄と二酸化窒素のコリガンドが,直近の鉄の調整球体にあることを確認する.
結論:
- 硫黄のドナーを持つ鉄二酸化窒素複合体のユニークなクラスが確立されています.
- これらの複合体は,鉄の周りの窒素と硫黄のリガンドの相互作用を研究するための貴重なモデルシステムを表しています.
- この発見は,電子とステリック特性を合わせた触媒の設計に新たな道を開く.
さらに関連する動画
関連する概念動画
03:45Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
02:51Metal-Ligand Bonds
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...
01:20Sulfur Assimilation
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
03:02Colors and Magnetism
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 eye.
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 eye.
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...