Selectively Extending the Curved Side of N‐Doped Hexa‐peri‐ hexabenzocoronene

A curved nanographene, conceptually by insertion of nitrogen into a trapezoidal planar nanographene at the edge was synthesized by π‐extension of the nitrogen‐doped hexa‐ peri ‐hexabenzocoronene. This N‐doped nanographene exhibited a π‐electronic concave face containing a nonaromatic azepine ring in the middle with a size of 14.0 Å length and 4.0 Å depth, which represents an unprecedented half‐side concave geometry of curved nanographene. The bent π‐extension exhibited a low degree of conjugation suggested by calculation results. Due to the unique 3D structure and electron‐rich property, this nanographene showed pronounced intermolecular charge transfer with C 60 .