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Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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 para position.

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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Published on: May 28, 2014

Functionalised azetidines as ligands: pyridyl-complemented coordination.

Young Hoon Lee¹, Jack Harrowfield, Yang Kim

¹Department of Chemistry, Kyungpook National University, Daegu 702-701, South Korea.

Dalton Transactions (Cambridge, England : 2003)

|January 6, 2009

Summary

A novel azetidine derivative acts as a tridentate ligand for copper(II), forming planar CuN3 complexes. These complexes exhibit a balance of mononuclear and binuclear structures, and reaction with cyanide yields an oxamidine-nickel(II) complex.

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Area of Science:

Coordination Chemistry
Inorganic Chemistry

Background:

Azetidine derivatives are versatile ligands in coordination chemistry.
Understanding the structural diversity of metal complexes is crucial for developing new materials.

Purpose of the Study:

To synthesize and characterize a novel azetidine derivative as a ligand for copper(II).
To investigate the structural properties and reactivity of the resulting copper(II) complexes.
To explore the formation of new complexes upon ligand displacement.

Main Methods:

Synthesis of a 2-aminoethyl-2-pyridyl substituted azetidine derivative.
Complexation with copper(II) ions.
Crystallographic analysis of the resulting copper(II) species.
Reaction of copper(II) complexes with cyanide and subsequent characterization of the oxamidine-nickel(II) complex.

Main Results:

The azetidine derivative functions as a tridentate ligand, forming planar CuN3 units.
Copper(II) complexes exist as a mixture of mononuclear and binuclear forms in the solid state.
Cyanide displaces the ligand from copper(II), leading to cyanogen formation.
Cyanogen reacts with the free amine to form an oxamidine, which forms a binuclear nickel(II) complex.

Conclusions:

A simple azetidine derivative can effectively coordinate to Cu(II) and exhibit complex structural behavior.
The reactivity of the ligand and its complexes with cyanide opens pathways to new organometallic compounds.
The study highlights the interplay between ligand structure, metal coordination, and solid-state packing.