Pentadiynylidyne and Pentacarbido Complexes.

Area of Science:

• Organometallic Chemistry
• Inorganic Synthesis
• Materials Science

Background:

• Carbyne complexes are versatile building blocks in organometallic chemistry.
• The synthesis of novel carbon-rich ligands and complexes remains a significant challenge.
• Tungsten-based complexes offer unique electronic and structural properties.

Purpose of the Study:

• To synthesize and characterize the first pentadiynylidyne tungsten complex.
• To explore desilylation as a general route to heterobimetallic pentacarbido complexes.
• To investigate the potential of these complexes in catalysis and materials science.

Main Methods:

• Reaction of a halocarbyne tungsten complex [W(≡CBr)(CO)2(Tp*)] with trimethylsilyl-butadiyne.
• Palladium and copper iodide catalysis for the formation of the pentadiynylidyne complex.
• Desilylation of the synthesized complex to generate pentacarbido species.

Main Results:

• Successful synthesis of the first pentadiynylidyne tungsten complex [W(≡CC≡CC≡CSiMe3)(CO)2(Tp*)].
• Demonstration of desilylation as a viable method for accessing pentacarbido complexes.
• Formation of novel heterobimetallic complexes, including [(Tp*)(CO)2W(μ-C5)(PPh3)2Ru(η-C5H5)] and [(Ph3P)2(CO)HIr{(μ-C5)W(CO)2(Tp*)}2].

Conclusions:

• The study presents a novel synthetic route to pentadiynylidyne and pentacarbido tungsten complexes.
• The developed methodology enables the construction of complex heterobimetallic structures.
• These findings open new avenues for the design of advanced organometallic materials and catalysts.