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Formation of Complex Ions

Formation of Complex Ions

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...

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

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

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 water loss...

Precipitation Titration Curve: Analysis

Precipitation Titration Curve: Analysis

The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...

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

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

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.

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...

Nitriles to Ketones: Grignard Reaction

Nitriles to Ketones: Grignard Reaction

Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
The mechanism begins with a nucleophilic attack by the Grignard reagent...

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(Nitrato-κO,O')bis-(tryptanthrin-κN)silver(I).

Jie Wu, Chao Huang, Guo-Qiang Li

Acta Crystallographica. Section E, Structure Reports Online

|February 21, 2012

Summary

This summary is machine-generated.

Tryptanthrin and silver nitrate form a 2:1 complex. The crystal structure reveals coordination through nitrogen and oxygen atoms, forming a 3D network via intermolecular interactions.

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Area of Science:

Coordination Chemistry
Crystallography
Supramolecular Chemistry

Background:

Tryptanthrin is an organic compound with potential applications in medicinal chemistry.
Silver nitrate is a common inorganic salt used in various chemical syntheses.
Metal-organic complexes can exhibit unique structural and electronic properties.

Purpose of the Study:

To synthesize and characterize a novel complex formed between tryptanthrin and silver nitrate.
To elucidate the crystal structure and coordination environment of the silver ion.
To investigate the intermolecular interactions responsible for the crystal packing.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
The coordination geometry around the silver ion was analyzed.
Intermolecular interactions, including C-H⋯O hydrogen bonds and π-π stacking, were identified.

Main Results:

A 2:1 complex of [Ag(NO3)(tryptanthrin)2] was successfully synthesized and characterized.
The silver ion is coordinated by two nitrogen atoms from tryptanthrin ligands and two oxygen atoms from a nitrate anion.
Ag-N bond lengths are 2.247(3) and 2.264(3) Å; Ag-O bond lengths are 2.499(3) and 2.591(3) Å.
A dihedral angle of 81.6(2)° was observed between the N-Ag-N and O-Ag-O planes.
The crystal structure is stabilized by C-H⋯O interactions and π-π stacking (centroid-centroid distance = 3.706(4) Å), forming a 3D network.

Conclusions:

The study provides detailed structural insights into the coordination complex of tryptanthrin and silver nitrate.
The formation of a three-dimensional network highlights the importance of non-covalent interactions in crystal engineering.
This work contributes to the understanding of metal-organic complexes involving heterocyclic ligands.