Doubly bonded systems between heavier Group 15 elements.

Area of Science:

• Inorganic Chemistry
• Organometallic Chemistry
• Materials Science

Background:

• Heavier Group 15 elements form doubly bonded compounds (dipnictenes) analogous to azo-compounds.
• These compounds are typically highly reactive and difficult to isolate.
• Previous research focused on diphosphenes, diarsenes, and phosphaarsenes with bulky substituents.

Purpose of the Study:

• To synthesize and characterize stable dipnictenes involving heavier Group 15 elements.
• To explore the role of steric protection in stabilizing these reactive species.
• To understand the fundamental chemistry and potential material applications of these compounds.

Main Methods:

• Utilized bulky steric protection groups: 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl (Bbt).
• Synthesized and isolated the first stable distibene (RSb=SbR) and dibismuthene (RBi=BiR).
• Systematically investigated the structures and properties of these novel compounds.

Main Results:

• Achieved the synthesis of the first kinetically stabilized distibene and dibismuthene.
• Demonstrated that heavy dipnictenes can be isolated and are stable when sterically protected.
• Characterized the structures and properties, confirming their real existence.

Conclusions:

• Doubly bonded compounds between heavier Group 15 elements are not merely theoretical but exist as stable, isolable species.
• Effective steric protection is crucial for the kinetic stabilization of these dipnictenes.
• This research opens new avenues for fundamental and materials chemistry involving heavy pnictogen compounds.