ルイス塩基媒介によるGeCl2とSnCl2のオートイオン化
Amit Pratap Singh1, Herbert W Roesky, Elena Carl
1Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany.
Journal of the American Chemical Society
|February 15, 2012
まとめ
研究者らは,シフ塩基リガンドを使用して,新しいカチオンおよびアニオンゲルマーニウム (II) と亜鉛 (II) 塩化物種を合成した. これらの化合物は,主要グループ化学および産業用アプリケーションの可能性を秘めています.
科学分野:
- メイングループ化学
- オーガノメタリック化学
- 協調化学は,協調化学である.
背景:
- 低値14族の元素 (ゲルマニアム,チン) は,メイングループ化学の重要な標的である.
- これらの元素のカチオンおよびアニオン種は,重要な合成および工業的可能性を秘めています.
- シーフ基底リガンドは,金属イオンのための多用途の調整環境を提供します.
研究 の 目的:
- ゲルマニウム (II) と亜鉛 (II) の新しいカチオンおよびアニオン種を合成し,特徴づけること.
- 低価金属ハライドの安定化におけるシフ基底リガンドの置換の有用性を調査する.
- 合成された化合物の構造的および電子的性質を調査する.
主な方法:
- カチオンとアニオンのゲルマニウム (II) と亜鉛 (II) クロリドの合成.
- 2,6-ディアセチルピリジネビス ((2,6-ダイソプロピラニル) をルイス塩基 (LB) として利用する.
- スペクトロスコープ法と単結晶X線構造分析を用いた特徴化.
主要な成果:
- 化合物の合成が成功し[LB]Ge[II]Cl](+) [Ge[II]Cl(3) ](-) (1) と[LB]Sn[II]Cl](+) [Sn[II]Cl(3) ](-) (2). 化合物の合成が成功し,化合物の合成が成功し,化合物の合成が成功し,化合物の合成が成功し,化合物の合成が成功し,化合物の合成が成功しました.
- 化合物1と2には,低価イオンと低価イオンの両方が含まれています.
- 構造の解明により,カチオン性およびアニオン性種の存在が確認されました.
結論:
- 置換されたシフ基は,カチオンおよびアニオンゲルマニウム (II) と亜鉛 (II) 塩化物種を効果的に安定させます.
- 合成された化合物は,低価量グループ14の元素化学の新しい例を表しています.
- これらの発見は,その反応性と応用に関するさらなる探求の道を開く.
![The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F54498.jpg&w=3840&q=50)
関連する概念動画
02:33Lewis Acids and Bases
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
02:16Lewis Acids and Bases
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
01:14Acid Halides to Ketones: Gilman Reagent
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen double...
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen double...
02:25SN1 Reaction: Mechanism
Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism.
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a polar...
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a polar...
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
02:14SN2 Reaction: Kinetics
Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.