Pentacyclic and Hexacyclic Osmaarynes and Their Derivatives

Area of Science:

• Organometallic Chemistry
• Materials Science
• Organic Synthesis

Background:

• The synthesis of polycyclic osmaarynes remains a significant challenge in organometallic chemistry.
• Previous reports include simpler osmaaryne structures, but complex fused systems are less explored.

Purpose of the Study:

• To report the first successful synthesis of pentacyclic and hexacyclic osmaarynes.
• To investigate the properties of the resulting osmium complexes derived from these novel osmaarynes.

Main Methods:

• Synthesis of pyreno[b]osmabenzynes and peryleno[b]osmabenzyne.
• Nucleophilic reactions of the synthesized osmaarynes.
• Characterization of the resulting pyreno[b]osmium and peryleno[b]osmium complexes.

Main Results:

• Successful synthesis of pentacyclic (1a, 2a) and hexacyclic (3a) osmaarynes.
• Formation of osmium complexes (1, 2, and 3) exhibiting near-infrared luminescence.
• Observed aggregation-induced emission (AIE) properties in the osmium complexes.
• Complexes 2 and 3 demonstrated resistance to photodegradation.
• Complex 2 showed superior photothermal conversion properties compared to complex 3.

Conclusions:

• This study presents a breakthrough in the synthesis of complex polycyclic osmaarynes.
• The derived osmium complexes possess valuable photophysical properties, including NIR luminescence and AIE.
• These findings open avenues for developing advanced materials for optical and photothermal applications.