Au(III) complexes with tetradentate-cyclam-based ligands.

Area of Science:

• Coordination Chemistry
• Organic Synthesis
• Catalysis

Background:

• Chiral macrocyclic ligands, such as cyclam, are crucial in coordination chemistry and catalysis.
• The synthesis of chiral cyclam derivatives with specific coordination geometries is challenging.
• Gold(III) complexes are of interest due to their unique electronic properties and catalytic potential.

Purpose of the Study:

• To develop a novel synthetic route for chiral cyclam derivatives.
• To synthesize and characterize new tetra-coordinated N,N,N,N-Au(III) complexes.
• To evaluate the catalytic activity of these novel gold(III) complexes.

Main Methods:

• Stepwise synthesis of chiral cyclam derivatives from chiral diamines and malonyl dichloride.
• Coordination of cyclam derivatives with AuCl3 to form Au(III) complexes.
• Characterization of intermediates and final products, including catalytic testing.

Main Results:

• Successful synthesis of chiral cyclam derivatives with yields ranging from 53-59%.
• Formation of novel tetra-coordinated N,N,N,N-Au(III) complexes with alternating chelate rings.
• Demonstrated high catalytic activity for some Au(III) complexes, achieving full conversion and high product yields.

Conclusions:

• A new, efficient protocol for synthesizing chiral cyclam derivatives has been established.
• Novel chiral cyclam-based Au(III) complexes were successfully prepared and characterized.
• The synthesized Au(III) complexes show promising catalytic potential for various chemical transformations.