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A carbon-free sandwich complex [(P5)2Ti]2-.

Eugenijus Urnius¹, William W Brennessel, Christopher J Cramer

¹Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA. urnezius@mtu.edu

Science (New York, N.Y.)

|February 2, 2002

Summary

Researchers synthesized the first inorganic metallocene using titanium and white phosphorus. This stable compound, [(eta5-P5)2Ti](2-), features unique phosphorus rings, offering new possibilities in inorganic chemistry.

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Area of Science:

Inorganic Chemistry
Organometallic Chemistry
Materials Science

Background:

Metallocenes, typically carbon-based, are crucial in catalysis and materials science.
The synthesis of entirely inorganic analogues presents a significant challenge and opportunity.
White phosphorus (P4) is a reactive allotrope requiring careful handling in complex synthesis.

Purpose of the Study:

To synthesize and characterize the first entirely inorganic metallocene complex.
To investigate the structural and electronic properties of this novel compound.
To explore the stability and potential applications of inorganic metallocenes.

Main Methods:

Reaction of highly reduced titanium complexes with white phosphorus (P4) at controlled temperatures (≤ 25°C).
Isolation and characterization of the resulting salts, [(eta5-P5)2Ti](2-).
X-ray crystallography to determine the molecular structure.
Computational studies (e.g., DFT) to analyze electronic properties and bonding.

Main Results:

Successful synthesis of the first entirely inorganic metallocene, [(eta5-P5)2Ti](2-), featuring planar, parallel pentaphosphacyclopentadienyl (P5) ligands.
The complex exhibits a stable, electron-deficient (16-electron) titanium center in a formally zerovalent state.
The P5 ligand acts as a strong acceptor, significantly stabilizing the metallocene structure.
The compound demonstrates high thermal and air stability in both solution and solid states.

Conclusions:

The discovery of [(eta5-P5)2Ti](2-) expands the scope of metallocene chemistry beyond carbon frameworks.
The pentaphosphacyclopentadienyl ligand is a viable and effective analogue to cyclopentadienyl ligands in stabilizing metal complexes.
This inorganic metallocene represents a new class of stable, potentially versatile compounds for chemical research and development.