Hydrazido complexes prepared by methylation of an anionic end-on bridging dinitrogen dititanium complex

Area of Science:

• Organometallic Chemistry
• Nitrogen Fixation Chemistry

Background:

• Dinitrogen (N2) is a stable molecule, making its chemical transformation challenging.
• Developing efficient methods for dinitrogen activation and functionalization is crucial for ammonia synthesis and other industrial processes.

Purpose of the Study:

• To report the stepwise methylation of dinitrogen.
• To establish a synthetic cycle for pentamethylhydrazinium formation from dinitrogen.
• To explore further functionalization of dinitrogen and hydrazido complexes.

Main Methods:

• Utilized a titanium system with a tripodal aryloxide supporting ligand.
• Investigated stepwise methylation reactions of an end-on bridging dinitrogen complex.
• Performed silylation of the dinitrogen complex and carboxylation of the hydrazido complex.

Main Results:

• Achieved stepwise methylation of dinitrogen to a hydrazido ligand and subsequently to a pentamethylhydrazinium salt.
• Demonstrated a complete synthetic cycle for pentamethylhydrazinium formation from dinitrogen and methyl iodide.
• Reported successful silylation and carboxylation reactions on the intermediate complexes.

Conclusions:

• The titanium system effectively mediates the stepwise methylation of dinitrogen.
• A novel synthetic pathway for pentamethylhydrazinium has been established.
• The study expands the known reactivity of coordinated dinitrogen and hydrazido ligands.