Crystal structure of (OC)₅W(μ-dppe)W(CO)₅

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Tungsten carbonyl complexes are foundational in organometallic chemistry.
• Bridging ligands play a crucial role in dictating the structure and reactivity of metal clusters.
• Understanding the coordination environment of metal centers is key to predicting complex behavior.

Purpose of the Study:

• To synthesize and characterize a novel centrosymmetric tungsten complex.
• To elucidate the coordination geometry and bonding of the bridging bis-(di-phenyl-phosphan-yl)ethane ligand.
• To investigate the structural implications of bridging ligands in dinuclear tungsten systems.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the precise molecular structure.
• Spectroscopic techniques (e.g., IR, NMR) were likely used for characterization (though not explicitly stated in the abstract).
• Chemical synthesis methods were utilized to prepare the target complex.

Main Results:

• The title complex, [W₂(C₂₆H₂₄P₂)(CO)₁₀], was successfully synthesized and confirmed to be centrosymmetric.
• Two W(CO)₅ moieties are bridged by a bis-(di-phenyl-phosphan-yl)ethane (dppe) ligand.
• Each tungsten(0) atom exhibits a distorted octahedral coordination, bonded to five carbonyl ligands and one phosphorus atom of the dppe ligand, with a W-W separation of 5.625(5) Å.

Conclusions:

• The dppe ligand effectively bridges two tungsten centers, forming a dinuclear complex with specific coordination geometry.
• The centrosymmetric nature of the complex is a key structural feature arising from the bridging ligand.
• This structural information provides a basis for understanding the electronic and reactive properties of similar dinuclear tungsten compounds.