A zirconocene triazenido hydride complex activates CO₂

Area of Science:

• Organometallic Chemistry
• Zirconocene Chemistry
• Small Molecule Activation

Background:

• Zirconocene complexes are versatile catalysts in organic synthesis.
• Activation of small molecules like CO2 is crucial for sustainable chemistry.
• Understanding reaction mechanisms is key to designing efficient catalytic systems.

Purpose of the Study:

• To synthesize and characterize a novel zirconocene(IV) triazenido hydride complex.
• To investigate the complex's reactivity towards small molecules, specifically CO2.
• To elucidate the mechanism of CO2 activation and subsequent formate formation.

Main Methods:

• Synthesis of the zirconocene(IV) triazenido hydride complex from a known alkyne complex.
• Characterization using spectroscopic and analytical techniques.
• Computational investigation using Density Functional Theory (DFT) methods.

Main Results:

• Successful synthesis and full characterization of the target zirconocene complex.
• Formation of a zirconocene(IV) triazenido-formate complex upon reaction with CO2.
• DFT calculations revealed pyridine's crucial role in facilitating hydrogen transfer.

Conclusions:

• The novel zirconocene complex is capable of activating CO2.
• Pyridine ligand plays a significant role in the catalytic cycle by promoting hydrogen transfer.
• This work provides insights into the reactivity of zirconocene complexes with small molecules.