ArticleAdvanced materials (Deerfield Beach, Fla.)2026
Backbone Engineering of Carbon-Centered NHC-Derived Diradicals: From Electronic State Tuning to High-Performance Organic Field-Effect Transistors.
Article in Advanced materials (Deerfield Beach, Fla.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Diradicals have gained interest for their unique electronic properties and potential applications in organic electronics and semiconductors. However, precise manipulation of electronic states and achieving satisfactory device performance remain challenging. Herein, we report the synthesis and characterization of tetraphenylethylene-bridged salts and their neutral diradical counterparts obtained via two-electron reduction. With extended conjugation and electron-withdrawing N-heterocyclic carbene (NHC) backbones, enhanced open-shell character is observed. Through this systematic study, a backbone engineering strategy is established that allows precise control over spin states and diradical character in carbon-centered NHC diradicals. Leveraging this strategy, compound 2d, with moderate diradical character induced by extended conjugated structures and strong electron-withdrawing groups, was employed in a spin-coated organic field-effect transistor (OFET) device. The device achieved a record-high hole mobility of 4.53 cm
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