title: A π-Extended Donor-Acceptor-Donor Triphenylene Twin Linked via a Pyrazine Bridge.
abstract: β-Amino triphenylenes can be accessed via palladium catalyzed amination of the corresponding triflate using benzophenone imine. Transformation of amine 6 to benzoyl amide 18 is also straightforward, and its wide mesophase range demonstrates that the new linkage supports columnar liquid crystal formation. Amine 6 also undergoes clean aerobic oxidation to give a new twinned structure linked through an electron-poor pyrazine ring. The new discotic liquid crystal motif contains donor and acceptor fragments and is more oval in shape rather than disk-like. It forms a wide range columnar mesophase. Absorption spectra are strong and broad; emission is also broad and occurs with a Stokes shift of ca. 0.7 eV, indicative of charge-transfer character.
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, P. R. China.
authors.forename: Weikang
authors.initials: W
authors.lastname: Xiao
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, P. R. China.
authors.forename: Zhiqun
authors.initials: Z
authors.lastname: He
authors.affiliation: ‡School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.
authors.forename: Sonia
authors.initials: S
authors.lastname: Remiro-Buenamañana
authors.affiliation: ‡School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.
authors.forename: Rebecca J
authors.initials: RJ
authors.lastname: Turner
authors.affiliation: †Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, P. R. China.
authors.forename: Min
authors.initials: M
authors.lastname: Xu
authors.affiliation: ‡School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yang
authors.affiliation: §College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
authors.forename: Xiping
authors.initials: X
authors.lastname: Jing
authors.affiliation: ‡School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Cammidge