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An azonia derivative of hexahelicene
Kiyoshi Sato1, Sadao Arai, Takamichi Yamagishi
1Department 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
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.