Unusual coordination assemblies from platinum(II) thienyl and bithienyl complexes

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Platinum complexes with N-heterocyclic carbene ligands are of interest due to their catalytic and structural properties.
• The synthesis of complex multinuclear platinum structures remains a challenge in coordination chemistry.

Purpose of the Study:

• To synthesize and structurally characterize novel dinuclear and tetranuclear platinum complexes.
• To explore the reactivity of platinum complexes with thiophene-based ligands.
• To investigate the formation of unique ring systems in platinum coordination chemistry.

Main Methods:

• Synthesis of dinuclear platinum complexes featuring a bithiophene ligand.
• Reaction of platinum complexes with isonicotinic acid and silver triflate.
• Structural characterization of the resulting platinum complexes using single-crystal X-ray crystallography.

Main Results:

• Formation of a tetranuclear platinum complex, [Pt(4)(dppf)(4)(mu(2)-O(2)CC(5)H(4)N)(4)](4+)4OTf(-), an "all-ring" system with four platinum rings.
• Synthesis of a dinuclear platinum complex, [Pt(2)(dppf)(2)(mu(2),eta(1)(C),eta(1)(S)-C(4)H(3)S)(2)](2+)2OTf(-), featuring an unusual six-membered ring formed by Pt-thienyl fusion at sulfur sites.
• Successful structural elucidation of all synthesized platinum complexes via X-ray crystallography.

Conclusions:

• The study demonstrates the successful synthesis of complex multinuclear platinum structures with novel ring architectures.
• The reactivity of platinum complexes with specific ligands can lead to the formation of unique fused ring systems.
• Single-crystal X-ray crystallography is crucial for confirming the intricate structures of these platinum coordination compounds.