Heptagon‐Embedded Pentacene: Synthesis, Structures, and Thin‐Film Transistors of Dibenzo[ d , d ′]benzo[1,2‐ a :4,5‐ a ′]dicycloheptenes

This study presents a new class of conjugated polycyclic molecules that contain seven-membered rings, detailing their synthesis, crystal structures and semiconductor properties. These molecules have a nearly flat C6-C7-C6-C7-C6 polycyclic framework with a p-quinodimethane core. With field-effect mobilities of up to 0.76 cm(2) V(-1) s(-1) as measured from solution-processed thin-film transistors, these molecules are alternatives to the well-studied pentacene analogues for applications in organic electronic devices.