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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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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.
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Bis(silylene)-Stabilized Monovalent Nitrogen Complexes.

Shenglai Yao1, Tibor Szilvási2, Yun Xiong1

  • 1Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17. Juni 135, Sekr. C2, 10623, Berlin, Germany.

Angewandte Chemie (International Ed. in English)
|August 26, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel bis(silylene)-stabilized nitrogen(I) compounds. These compounds, featuring a unique carborane scaffold, demonstrate versatile redox behavior and offer new avenues in inorganic chemistry.

Keywords:
azidescarboranesnitrogen complexesredox non-innocent ligandssilylenes

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Area of Science:

  • Organometallic Chemistry
  • Boron Chemistry
  • Main Group Chemistry

Background:

  • Stabilized silylenes are crucial intermediates in silicon chemistry.
  • Nitrogen(I) compounds are relatively underexplored due to their reactivity.
  • Carborane scaffolds offer unique structural and electronic properties.

Purpose of the Study:

  • To synthesize and characterize the first series of bis(silylene)-stabilized nitrogen(I) compounds.
  • To explore the redox behavior of these novel compounds.
  • To investigate the influence of the carborane cage on the nitrogen(I) complex stability.

Main Methods:

  • Synthesis of a 1,2-bis(N-heterocyclic silylenyl) 1,2-dicarba-closo-dedocaborane(12) scaffold.
  • Reaction with adamantyl azide to form a zwitterionic adduct.
  • Redox manipulation (one-electron reduction and oxidation) using potassium and silver(I).

Main Results:

  • Isolation of a bis(silylene)-stabilized nitrogen(I) complex anion with a nido-carborane core.
  • Formation of a monocationic bis(silylene) nitrogen(I) complex with a closo-carborane core.
  • Generation of a neutral nitrogen(I) radical complex through single-electron transfer.

Conclusions:

  • The carborane scaffold effectively stabilizes bis(silylene) nitrogen(I) species.
  • The compounds exhibit tunable redox states (anionic, cationic, and radical).
  • This work expands the scope of isolable nitrogen(I) compounds and their complexes.