N-aryloxide-amidinate group 4 metal complexes.

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Ligand Design

Background:

• Synthesis of N-aryloxide-amidine ligands is crucial for developing new coordination compounds.
• Group 4 metal complexes are widely studied for their catalytic and material properties.

Purpose of the Study:

• To synthesize a novel N-aryloxide-amidine ligand (H3L).
• To investigate the coordination behavior of H3L with group 4 metal chlorides (MIVCl4).
• To explore the structural and electronic variations in the resulting dimeric complexes (LMIV-Cl)2.

Main Methods:

• Two-step synthesis of the N-aryloxide-amidine ligand.
• Reaction of the deprotonated ligand with group 4 metal tetrachlorides (Ti, Zr, Hf).
• Characterization of the resulting dimeric metal complexes using spectroscopic and crystallographic techniques.
• Further reaction of the hafnium complex with HfCl4 and azide source to form a binuclear metal azide.

Main Results:

• Successful synthesis of the H3L ligand.
• Formation of dimeric complexes (LMIV-Cl)2 with varying coordination modes based on metal ion radius.
• Observed differences in ArO- arm coordination and amidinate moiety C-N bond localization between titanium and zirconium/hafnium complexes.
• Synthesis of a binuclear hafnium azide complex with a changed amidinate coordination mode.

Conclusions:

• The N-aryloxide-amidine ligand exhibits versatile coordination behavior with group 4 metals.
• Metal ion size significantly influences the structure and electronic properties of the resulting complexes.
• The ligand framework can be further functionalized to yield more complex multinuclear metal species.