Syntheses and Photophysical Properties of Pnictogen‐ and Chalcogen‐Containing Diheteroanthracenes

Abstract

Herein, we synthesized pnictogen (P, As, Sb)‐ and chalcogen (O, S)‐containing diheteroanthracene derivatives with 8π‐electron systems. As opposed to the pnictogen atoms, the chalcogen atoms significantly affected the conformations of the diheteroanthracenes. In addition, the S‐containing compounds exhibited relatively large Stokes shifts owing to significant structural relaxations compared with those of the O‐containing compounds. Computational calculations revealed that the bent conformations of the S‐containing compounds in their ground states planarized upon photoexcitation.