オリエンテッドの外部電場:ハロゲン結合複合体の反応のためのピネッツェルと触媒
Chao Wang1,2, David Danovich1, Hui Chen2
1Institute of Chemistry , The Hebrew University of Jerusalem , Jerusalem 9190407 , Israel.
Journal of the American Chemical Society
|April 5, 2019
まとめ
オリエンテッド外部電場 (OEEF) は,珍しいハロゲン結合 (XB) 異位反応を触媒化する. これらの電場は反応性を制御し, 臨界強度で自発的な,障壁のない反応を可能にします.
科学分野:
- 理論化学
- 化学物理学
背景:
- ハロゲン結合 (XB) は分子相互作用において極めて重要です.
- XBを含む移動反応は,通常,高いエネルギーバリアを持っています.
- XBの反応性を制御することは,化学合成に不可欠です.
研究 の 目的:
- XB 移動反応を制御し,有効にする方法を調査する.
- XBの反応性に対する方向外電場 (OEEF) の触媒効果を調査する.
- OEEF誘発の触媒の仕組みを理解する.
主な方法:
- 14のXBシステムの理論研究
- ガスと溶媒の相における反応障壁の分析
- ヴァレンスボンドモデリングの適用
- オリエンテッド・エクステリア・フィールド (OEEF) を使用したシミュレーション.
主要な成果:
- OEEFは"電気ピンチ"として作用し,XBの位移反応を数十kcal/molで触媒化する.
- 逆のOEEF方向は反応を阻害し,XB相互作用を弱める.
- クリティカルなOEEF濃度では,反応は自発的で障壁のないものになります.
- OEEFはXBの構造と反応性を正確に制御する.
結論:
- OEEFは複雑な化学反応を制御し 実現するための強力な方法です
- この触媒的アプローチは 分子反応性を操作するための 新たな道を開きます
- ヴァレンスの結合モデリングは,電場制御のメカニズムを明らかにします.
さらに関連する動画
04:46Changing the Direction and Orientation of Electric Field During Electric Pulses Application Improves Plasmid Gene Transfer in vitro
Published on: September 12, 2011
10.8K
06:44From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
69.6K
関連する概念動画
03:01Halogens
23.4K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
23.4K
01:16Electric Field
12.3K
Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
12.3K
02:58Crystal Field Theory - Octahedral Complexes
30.8K
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...
30.8K
02:43Peptide Bonds
82.6K
A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
82.6K
01:12Determining Electric Field From Electric Potential
4.9K
The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
4.9K
01:13Finding Electric Potential From Electric Field
5.4K
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
5.4K