Metal-templated diyne cyclodimerization and cyclotrimerization.

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• The synthesis of novel platinum complexes with unsaturated ligands is crucial for developing new materials and catalysts.
• Exploring the reactivity of platinum precursors with multidentate phosphine ligands can lead to complex structures.

Purpose of the Study:

• To investigate the reaction of dimethylplatinum(II) and platinum(II) chloride precursors with 1,4-bis(diphenylphosphino)but-1-en-3-yne (Ph2PCCCCPPh2).
• To characterize the resulting multinuclear platinum complexes and their structural features.

Main Methods:

• Synthesis of multinuclear platinum complexes using [Pt(CH3)2(COD)] and [PtCl2(COD)] precursors.
• Characterization of the products using spectroscopic techniques and elemental analysis.
• Thermal transformation studies of intermediate compounds.

Main Results:

• Reaction of [Pt(CH3)2(COD)] with Ph2PCCCCPPh2 yielded dimeric and trimeric complexes.
• Reaction of [PtCl2(COD)] with Ph2PCCCCPPh2 produced thermally unstable intermediates that transformed into complexes with 8- and 12-membered rings.
• Compound 2 was converted to a 12-membered ring complex (7) upon heating with CuCl.

Conclusions:

• The study successfully synthesized and characterized novel multinuclear platinum complexes with unique cyclic structures.
• The reactivity of platinum precursors with Ph2PCCCCPPh2 allows for the formation of diverse organometallic architectures.
• The findings contribute to the understanding of platinum-phosphine chemistry and the construction of complex metallacycles.