Leveraging Conformational and Nitrogen Atom Inversion for Room-Temperature Ferroelectricity.

Area of Science:

• Materials Science
• Organic Chemistry
• Solid State Physics

Background:

• Nitrogen inversion, a fundamental chemical process, lacks practical applications.
• Molecular ferroelectrics are key for next-generation digital information storage.

Purpose of the Study:

• To explore nitrogen inversion as a mechanism for ferroelectricity in novel molecular materials.
• To investigate azangulene as a candidate for above-room-temperature molecular ferroelectrics.

Main Methods:

• Crystallographic polymorphism studies.
• Computational investigations.
• Demonstration of polarization switching via whole-molecule inversion.

Main Results:

• Azangulene exhibits above-room-temperature ferroelectricity in a polar crystal packing.
• A stable, planar azangulene polymorph was isolated, challenging classical inversion mechanisms.
• The interplay of enthalpic and entropic factors was elucidated.

Conclusions:

• Nitrogen inversion can template polarization switching in molecular ferroelectrics.
• Azangulene represents a promising material for digital information storage.
• Understanding molecular conformation is crucial for designing functional materials.