title: Oxygen- and sulfur-containing positively charged polycyclic aromatic hydrocarbons.
abstract: Benzo[5,6]naphthaceno[1,12,11,10-jklmna]xanthylium (BNAX) and benzo[5,6]naphthaceno[1,12,11,10-jklmna]thioxanthylium (BNATX) salts were synthesized. Comparison of the UV-vis absorption and emission spectra of them and dibenzo[jk,mn]naphtho[2,1,8-fgh]thebenidinium (DBNT) salts suggests that the incorporation of different heteroatoms in the same PAH core changes their optoelectronic properties profoundly. Ordered columnar liquid crystalline phases were observed for di- and tridodecyl-substituted BNAX salts. X-ray scattering and molecular modeling indicate that three BNAX molecules self-assemble into a disklike structure, which further organizes into hexagonal columnar phases.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz, Germany.
authors.forename: Dongqing
authors.initials: D
authors.lastname: Wu
authors.forename: Wojciech
authors.initials: W
authors.lastname: Pisula
authors.forename: Monika C
authors.initials: MC
authors.lastname: Haberecht
authors.forename: Xinliang
authors.initials: X
authors.lastname: Feng
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen