Oxidation of copper(I) hexaaza macrocyclic dinuclear complexes

Area of Science:

• Inorganic Chemistry
• Computational Chemistry
• Materials Science

Background:

• Copper complexes are crucial catalysts in various oxidation reactions.
• Understanding the mechanism of oxygen activation by metal complexes is vital for catalysis.
• Macrocyclic ligands offer unique coordination environments for metal ions.

Purpose of the Study:

• To investigate the formation of peroxo intermediates from Cu(I) complexes with N-hexadentated macrocyclic dinucleating ligands.
• To elucidate the role of ligand structure in oxygen binding and intermediate formation.
• To explore the electronic factors governing O2 activation using computational methods.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Analysis of peroxo core structures (side-on and trans-peroxo).
• Application of Frontier Molecular Orbital (FMO) theory.
• Energy Decomposition Analysis (EDA) and Mayer bond order calculations.

Main Results:

• DFT calculations reveal the formation of peroxo intermediates from Cu(I) complexes and O2.
• The preferred structure of the peroxo intermediate (side-on vs. trans-peroxo) is influenced by ligand substituents and steric effects.
• FMO theory successfully explains O2 binding to Cu(I) complexes, correlating electronic properties.
• EDA and Mayer bond orders highlight subtle ligand-induced differences in bonding.

Conclusions:

• Ligand design significantly impacts the structure of peroxo intermediates in copper-catalyzed oxygenation.
• FMO theory provides a robust framework for understanding O2 activation mechanisms in copper complexes.
• Computational methods are powerful tools for dissecting reaction pathways and ligand effects in inorganic chemistry.