title: An azonia derivative of hexahelicene.
abstract: In 8a-azonia[6]helicene hexafluorophosphate or 8a-azoniaphenanthro[3,4-c]phenanthrene hexafluorophosphate, C(25)H(16)N(+) x PF(6)(-), replacement of an outer bridgehead carbon of hexahelicene by a quaternary Nsp(2) atom results in a geometrical change in the helical structure. The racemic heterohelicene forms homochiral columnar stacks through intermolecular pi-pi donor-acceptor interactions in the crystalline state.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan. sato-kiyoshi@c.metro-u.ac.jp
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Sato
authors.forename: Sadao
authors.initials: S
authors.lastname: Arai
authors.forename: Takamichi
authors.initials: T
authors.lastname: Yamagishi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Tanase