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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.5K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.5K
Carbocations02:10

Carbocations

13.2K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
13.2K
Alkyl Halides02:45

Alkyl Halides

19.3K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
19.3K
β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

β-Dicarbonyl Compounds via Crossed Claisen Condensations

3.7K
Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
3.7K
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

3.7K
Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
3.7K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

64.2K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
64.2K

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関連する実験動画

Updated: Dec 17, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

11.4K

ハイパーゴリック材料として,炭素基と原子精度の高い金属クラスター

Qian-You Wang1, Jie Wang1, Shan Wang1

  • 1Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.

Journal of the American Chemical Society
|June 26, 2020
PubMed
まとめ

原子的に精密な金属のクラスターは 窒素酸で自発的に点火する 超高圧活性を示します 金属のコアはこの反応を触媒化し,銅のドーピングは新しい推進燃料の燃焼を促進します.

さらに関連する動画

The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

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関連する実験動画

Last Updated: Dec 17, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
12:43

The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Published on: October 3, 2014

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科学分野:

  • 材料科学
  • 化学について
  • 航空宇宙工学

背景:

  • 原子精度の高い金属クラスターは 独特の特性を持つ新材料です
  • ハイパーゴリック推進剤は ロケットの信頼性の高い点火に不可欠です
  • O-カルボアネルキニルリガンドは典型的にはハイパーゴリック的に惰性である.

研究 の 目的:

  • O-カルボラネルキニルで保護された銀と銅銀のクラスタのハイパーゴリック活性を調べる.
  • 金属のクラスター・コアと 銅のドーピングの役割を理解するために
  • これらのクラスターの潜在力を 新型ハイパーゴリック燃料として探求する

主な方法:

  • 原子精度の高いO-カルボアニルキニル保護銀 (CBA-Ag) と銅銀 (CBA-CuAg) の合成
  • ホワイト・フーミング・ナトリウム酸と接触した際のハイパーゴリック活性検査
  • 燃焼遅延時間と燃焼触媒の分析

主要な成果:

  • CBA-AgとCBA-CuAgのクラスターは,窒素酸で自発的に点火する.
  • CBA-CuAgは,15ミリ秒の急速な点火遅延を示しています.
  • 金属クラスターコアは,Cuドーピングが燃焼を加速する惰性リガンドのハイパーゴリック反応を触媒化する.

結論:

  • 金属のクラスター・コアは,それ以外の不活性なリガンドのハイパーゴリック活動を可能にする鍵です.
  • 銅のドーピングは,燃焼触媒を大幅に強化し,燃焼速度を高速化します.
  • これらの発見は,推進剤のための高度な金属クラスターベースのハイパーゴリック燃料を設計するための新しい経路を提供します.