Generation of Aromatic (Dehydro)benzoannulene Dications Stabilized by Platinum Catecholate Complexes

Area of Science:

• Organometallic Chemistry
• Supramolecular Chemistry
• Aromaticity Studies

Background:

• Platinum catecholate complexes are known for their unique electronic properties.
• Stabilizing polycationic species, especially dications, remains a significant challenge in chemistry.
• Annulene frameworks offer versatile platforms for constructing complex molecular architectures.

Purpose of the Study:

• To investigate the oxidation of platinum catecholate complexes with dehydrobenzo[12]annulene and dibenzo[8]annulene frameworks.
• To determine the aromaticity and stability of the resulting mono-, di-, and trications.
• To establish a novel strategy for stabilizing aromatic dications.

Main Methods:

• Chemical and electrochemical oxidation of platinum catecholate complexes.
• Theoretical calculations (e.g., DFT) to assess electronic structure and energetics.
• Spectroscopic studies (e.g., NMR, UV-Vis) to characterize the oxidized species.
• Analysis of energetic, structural, and magnetic criteria for aromaticity.

Main Results:

• Mono-, di-, and trications were successfully generated from the platinum catecholate annulene complexes.
• Theoretical and spectroscopic evidence confirmed the aromatic nature of the generated dications.
• The platinum catecholate units effectively stabilize the aromatic dications.

Conclusions:

• A new method for stabilizing aromatic dications has been demonstrated.
• Platinum catecholate complexes with annulene frameworks provide a viable route to stable polycationic aromatic systems.
• This work expands the understanding of aromaticity in complex organometallic compounds.