An Ethynylene‐Bridged Pentacene Dimer: Two‐Step Synthesis and Charge‐Transport Properties

A rigid and planar ethynylene‐bridged pentacene dimer ( PenD ) was synthesized from pentacenequinone in two steps, skipping the conventional stepwise approach. A brickwork motif in the single crystal shows two‐dimensionally extended electronic interaction in the solid state. Highly crystalline dip‐coated films exhibited average hole mobility of 0.24 cm 2  V −1  s −1 , comparable to that of the single‐crystal organic field‐effect transistors. This discovery and understanding of the reaction for the facile synthesis of ethynylene‐bridged π‐conjugated systems enables to the synthesis of a wide range of organic semiconducting materials.