Abstract n Circulenes have attracted considerable research interest; however, open‐shell n circulene‐type structures remain elusive. In this study, we report the synthesis of a highly stable nor7circulenyl radical (nor7CR) and its isolation in the crystalline phase. nor7CR exhibits a distinct four‐stage amphoteric redox behavior, as revealed by cyclic voltammetry. The stable cation (nor7CR + ) was obtained via chemical oxidation and isolated in crystalline form, and the corresponding anionic species were characterized spectroscopically. Remarkably, nor7CR + exhibits strong NIR‐II absorption at 1105 nm with a high photothermal conversion efficiency (PCE) of 93%, as well as a high maximum photothermal temperature ( T max ) under low optical power density. The applications of nor7CR + in photothermal imaging and laser ignition were demonstrated, highlighting its great potential as a photothermal material.
Tian et al. (Tue,) studied this question.
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