Neutral Stable Nitrogen‐Centered Radicals: Structure, Properties, and Recent Functional Application Progress

Persistent and stable nitrogen‐centered organic radicals, including non‐heterocyclic/heterocyclic nitrogen‐centered radicals and nitrogen‐centered radical complexes, have attracted much attention due to their special multiple physical properties. Up to now, numerous nitrogen‐centered radical materials have been developed and applied as functional materials in magnetic, electronic, optical, and biologic fields. This review aims to discuss their structural features, physical properties, and recent progress in materials applications. Finally, an outlook providing inspiration for the future development is given. Stable nitrogen organic radicals have obtained more and more attention owing to their unique structure and properties, and great progress in functional material applications has been achieved. This review provides a comprehensive introduction on the structure, physical properties, and with focus on recent research on functional material applications. The challenges and promising future directions are also discussed.