Building Blocks for Molecular Polygons Based on Platinum Vertices and Polyynediyl Edges

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Diphosphine ligands are crucial in coordination chemistry for stabilizing metal centers and influencing reactivity.
• Platinum complexes with alkyne ligands are of interest for their electronic and photophysical properties.
• The synthesis of complex multinuclear metal structures remains a challenge in inorganic chemistry.

Purpose of the Study:

• To synthesize novel platinum diphosphine complexes featuring substituted arylalkyne ligands.
• To investigate the structural characterization and spectroscopic properties of these new compounds.
• To explore the formation of multinuclear platinum-alkyne architectures.

Main Methods:

• Synthesis of diphosphine ligands via Grignard reactions with dichlorophosphines.
• Coordination of diphosphines to platinum(II) precursors.
• Reactions with butadiyne and silylalkynes to form platinum-alkyne complexes.
• Structural determination using X-ray crystallography and NMR spectroscopy.

Main Results:

• Successful synthesis of a series of platinum diphosphine complexes with varying aryl substituents.
• Characterization of platinum complexes containing butadiyne and silylalkyne ligands.
• Formation and structural elucidation of a tetranuclear platinum-carbon polygon.
• Observation of complex NMR spin systems indicative of intricate metal-ligand interactions.

Conclusions:

• The developed synthetic routes provide access to diverse platinum diphosphine-alkyne systems.
• The study highlights the versatility of these ligands in constructing complex multinuclear platinum assemblies.
• The structural and spectroscopic data offer insights into bonding and electronic properties of these organometallic compounds.