濃縮相における水素置換シリウムイオンの特性
Qian Wu1, Elisabeth Irran1, Robert Müller1
1Institut für Chemie, Technische Universität Berlin, 10623 Berlin, Germany.
Science (New York, N.Y.)
|July 13, 2019
まとめ
研究者は,新しいプロトリシス戦略を使用して,水素で置換されたシリウムイオンを合成しました. この方法は,シリウムの化学理解に不可欠な,トリスチル-ブチルシリルおよびシリル水素イオンを含む様々なシリウムカチオンにアクセスできます.
科学分野:
- オルガノシリコン化学
- 炭水化物化学
- メイングループ元素化学
背景:
- 水素で置換されたシリリウムイオンは,シリコン化学で高度に反応し,求められる種です.
- 過去の研究では,これらの一時的な中間物質を分離し,特徴づけることに問題がありました.
- 安定化戦略の開発は,それらの基本的な性質を研究するために不可欠です.
研究 の 目的:
- 水素で置換されたシリウムイオンの完全なシリーズを合成するための信頼性の高い方法を開発する.
- これらのシリウムカチオンの構造と電子性質を調査する.
- 反応性シリコン種を安定化させるための大容量の置換物質とカウンターイオンの役割を理解する.
主な方法:
- カーボラン酸 ([CHB11H5Br6]-) を採用した原溶解法が用いられた.
- Si-C ((sp2)) またはSi-H結合の化学選択分裂が行われた.
- 合成されたシリウムイオンの分子構造を決定するために結晶学的分析が使用された.
主要な成果:
- [CHB11H5Br6] - 安定したR2SiH+,RSiH2+,およびSiH3+イオンへのアクセスが達成されました.
- シリコン上の大量のテルブチル群は,置換物の再分配を防ぐために不可欠でした.
- 結晶学的データは,SiH3+の三角平面構造と対照的に,R2SiH+とRSiH2+カチオンにおけるシリコン原子のピラミダ化を示した.
結論:
- 開発されたプロトリシス戦略は,水素で置換された様々なシリウムイオンへの堅固な経路を提供します.
- 観測された構造的多様性 (ピラミッド型対平面型シリコン) は,置換物質と対陽子の影響を強調する.
- この研究は,シリウムカチオンの化学および構造上の好みに関する基本的な洞察を提供します.
関連する概念動画
02:39Phase Transitions: Vaporization and Condensation
20.7K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
20.7K
02:31Phase Transitions
22.8K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.8K
01:33Aldol Condensation vs Claisen Condensation
7.8K
Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
7.8K
03:24Common Ion Effect
46.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
46.0K
00:26Hydrogen Bonds
131.7K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
131.7K
03:45Formation of Complex Ions
25.8K
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...
25.8K