Physics

Radiology

Fluorene

Lying

Chemistry

Nuclear magnetic resonance

Polymer

Medicine

Angewandte Chemie International Edition

Open-shell non-alternant polycyclic hydrocarbons (PHs) are attracting increasing attention due to their promising applications in organic spintronics and quantum computing. Herein we report the synthesis of three cyclohepta[def]fluorene-based diradicaloids (1-3), by fusion of benzo rings on its periphery for the thermodynamic stabilization, as evidenced by multiple characterization techniques. Remarkably, all of them display a very narrow optical energy gap (E

Benzo‐Extended Cyclohepta[<i>def</i>]fluorene Derivatives with Very Low‐Lying Triplet States

Benzo‐Extended Cyclohepta[def]fluorene Derivatives with Very Low‐Lying Triplet States