Recent developments in corrole radicals

Corrole is a tetrapyrrolic ring-contracted porphyrin analog with one direct pyrrole-pyrrole link. The corrole macrocycle is electron-rich and easily stabilized in its one electron oxidized radical state, especially when coordinated to some specific metal ions. The corrole radicals and their complexes have demonstrated excellent air stability, amphoteric redox properties, and diversified spin configurations. Herein, we summarize the recent developments in the synthesis and properties of various corrole radicals, including [Formula: see text]-monoradicals, antiferromagnetically and ferromagnetically coupled metal radicals, and [Formula: see text]-diradicals. The regulation of spin, redox, and optical properties of corrole radicals by modifications to their periphery substituents, coordinated metals, and axial ligands is highlighted, which demonstrates their promising application prospects in spintronics, electronics, and energy-conversion materials.