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相关概念视频

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
Formation of Complex Ions03:45

Formation of Complex Ions

23.6K
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...
23.6K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.8K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.8K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K

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Updated: Jul 2, 2025

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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评价铁硫复合体中的二氧化到N2的相互转换.

Reagan X Hooper1, Ashlee E Wertz2, Hannah S Shafaat2,3

  • 1Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT-06511.

Chemistry (Weinheim an der Bergstrasse, Germany)
|February 20, 2024
PubMed
概括

合成二铁复合物不通过质子合电子转移 (PCET) 模仿生物固定. 由于高的PCET屏障,研究的复合物形成了一个单核铁(III) 双,而不是一个二复合物.

关键词:
迪亚泽尼尼 (diazeneene) 是一种铁是铁,铁是铁,铁是铁.这种气是酸.化酶是一种化酶.质子合电子转移的电子转移.

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科学领域:

  • 生物有机化学 生物有机化学
  • 有机金属化学 有机金属化学
  • 固化的研究研究.

背景情况:

  • 生物 (N2) 减少发生在富含硫的多铁场所.
  • 一个拟议的途径涉及通过质子合电子转移 (PCET) 协同进行N2桥梁的双降解/质子化.
  • 人工硫支持的二铁复合体被探索为模仿这个生物过程.

研究的目的:

  • 测试模仿生物N2固定路径的合成硫支持二铁复合物的可行性.
  • 为了研究N2固定的微观反向的能量:氧化质子从二氧化转移.
  • 为了确定二铁-二烯复合物的氧化产品的结构和能量.

主要方法:

  • 共振拉曼光谱法 共振拉曼光谱法
  • 莫斯巴乌尔光谱法是使用的.
  • 核磁共振 (NMR) 光谱学是指核磁共振的光谱学.
  • 电子偏磁共振 (EPR) 光谱学
  • 密度函数理论 (DFT) 的计算.

主要成果:

  • 氧化产物被确定不是以前指定的二复合体.
  • 光谱和计算数据表明,形成了一个单核铁 (III) 亚烯复合体.
  • 计算显示,在反应温度下,拟议的双倍PCET途径的障碍极高.
  • 来自桥接diazene的PCET具有高度的exergonic性,使得反向N2质子化变为 endergonic.

结论:

  • 研究的合成二铁复合物不复制通过PCET提出的生物N2固定途径.
  • 铁位点的高氧化还原潜力有利于二氧化,阻碍N2质子化.
  • 这项工作建立了设计可逆N2/N2H2相互转换系统的"基本规则",通过调整金属场所的氧化还原潜力.