title: Annularly fused hexapyrrolohexaazacoronenes: an extended pi system with multiple interior nitrogen atoms displays stable oxidation states.
authors.affiliation: Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Takase
authors.forename: Volker
authors.initials: V
authors.lastname: Enkelmann
authors.forename: Daniel
authors.initials: D
authors.lastname: Sebastiani
authors.forename: Martin
authors.initials: M
authors.lastname: Baumgarten
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen