金の表面をC18H37HgOTおよび陽性Hg剥離によるC18H37HgOTによる処理によりアルキル化
Malgorzata Mucha1, Eva Kaletová, Anna Kohutová
1Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610 Prague 6, Czech Republic.
Journal of the American Chemical Society
|February 13, 2013
まとめ
研究者らは,水銀化合物を用いて,安定した金面単層を作り出した. このプロセスは,アルキル鎖を金に直接結合させ,強固な表面改変を提供します. 更に電気化学的な手順で水銀を取り除き,アルキル鎖のみを残すことができます.
科学分野:
- 表面化学について
- 電気化学 電気化学について
- 材料科学 材料科学とは
背景:
- 黄金の表面は,安定した改変を必要とする様々な用途において極めて重要です.
- オーガニック分子の黄金への共性結合は,表面科学の重要な分野である.
- 水銀化合物は,表面機能化のためのユニークな反応性を提供します.
研究 の 目的:
- 金の表面に共振的に吸収された単層の形成を調査するために.
- 結果となる単層の組成と安定性を特徴付けるために.
- モノレイヤからコンポーネントを選択的に除去する方法を探求する.
主な方法:
- 金の表面をC18H37HgOTs溶液で処理する.
- 赤外線スペクトロスコピー (IR),X線光電子スペクトロスコピー (XPS),UV光電子スペクトロスコピー (UPS).
- エリプソメトリー,コンタクト・アングル・ゴニオメトリー,微分パルス・ポラログラフィー,電気化学入口測定.
主要な成果:
- 黄金とHg(0) 原子に直接結合したアルキル鎖を含む,安定した,共振的に吸収された単層の形成.
- モノレイヤは,様々な化学物質に対する安定性を示しました.
- 完全な水銀の除去は,酸化電気化学的剥離によって達成され,アルキル鎖のみの金表面を残しました.
結論:
- 金の上に安定した,共結性結合のアルキル鎖単層を,水銀前駆体を使用して形成することができます.
- モノレイヤは,強固な表面特性を提供し,化学的分解に耐性があります.
- 水銀の選択的除去は可能であり,金に合わせた表面機能化を可能にします.
関連する概念動画
Voltammetry: Stripping Methods
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Acid 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...
Base-Promoted α-Halogenation of Aldehydes and Ketones
α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base. The reaction begins with the abstraction of α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction at the stage of...
Electrodeposition
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
Electrophilic Addition to Alkynes: Hydrohalogenation
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism
Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...


